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Stock Incentive Plan - Stock Options Activity (Details) (USD $)
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12 Months Ended | ||||||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Number of Options [Roll Forward] | |||||||
| Beginning balance (in shares) | 4,778,143 | 5,424,612 | 8,274,000 | ||||
| Granted (in shares) | 598,360 | [1] | 706,644 | [1] | 257,500 | ||
| Exercised (in shares) | (682,619) | (1,306,145) | (2,790,188) | ||||
| Forfeited (in shares) | (120,506) | (46,968) | (316,700) | ||||
| Ending balance (in shares) | 4,573,378 | 4,778,143 | 5,424,612 | ||||
| Options exercisable (in shares) | 3,067,015 | 3,309,722 | |||||
| Options expected to vest (in shares) | 1,492,239 | ||||||
| Weighted Average Exercise Price [Roll Forward] | |||||||
| Beginning balance (in usd per share) | $ 6.794 | $ 5.151 | $ 4.177 | ||||
| Granted (in usd per share) | $ 9.101 | [1] | $ 11.782 | [1] | $ 12.520 | ||
| Exercised (in usd per share) | $ 3.037 | $ 2.651 | $ 2.305 | ||||
| Forfeited (in usd per share) | $ 11.691 | $ 2.749 | $ 10.787 | ||||
| Ending balance (in usd per share) | $ 7.528 | $ 6.794 | $ 5.151 | ||||
| Options exercisable (in usd per share) | $ 6.074 | $ 4.986 | |||||
| Expected to vest (in usd per share) | $ 10.489 | ||||||
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| X | ||||||||||
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- Definition
The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Gross number of share options (or share units) granted during the period. No definition available.
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| X | ||||||||||
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- Definition
Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average price at which option holders acquired shares when converting their stock options into shares. No definition available.
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| X | ||||||||||
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- Definition
Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. No definition available.
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| X | ||||||||||
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- Definition
Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. No definition available.
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| X | ||||||||||
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- Definition
Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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