Summary of Significant Accounting Policies - Share Repurchase Agreement (Details) - USD ($) |
3 Months Ended | 9 Months Ended | |
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Sep. 30, 2016 |
Sep. 30, 2016 |
Apr. 30, 2016 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Open market purchase of treasury shares | $ 4,451,000 | ||
| Treasury Stock | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Open market purchase of common shares (in shares) | 503,246 | 920,944 | |
| Open market purchase of treasury shares | $ 2,502,000 | $ 4,451,000 | |
| Common Class A | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Stock repurchase program, authorized amount (up to) | $ 10,000,000 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount of stock repurchase plan authorized. No definition available.
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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