Summary of Significant Accounting Policies - Share Repurchase Program (Details) - USD ($) |
12 Months Ended | |
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Dec. 31, 2016 |
Apr. 30, 2016 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Treasury stock, shares, acquired | 1,298,418 | |
| Treasury stock, value, acquired | $ 6,387,000 | |
| Repurchase fees | $ 52,000 | |
| Class A Common Stock | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Stock repurchase program, authorized amount (up to) | $ 10,000,000 | |
| Treasury Stock | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Treasury stock, shares, acquired | (1,298,418) | |
| Treasury stock, value, acquired | $ 6,387,000 |
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- Definition Stock Repurchase Program, Repurchase Fees No definition available.
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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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