Stock-Based Compensation - (Details Textual) - USD ($)
$ in Thousands |
|
12 Months Ended |
|
|
May 15, 2014 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
Oct. 26, 2011 |
| Stock-Based Compensation (Textual) [Abstract] |
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| Common Stock (in shares) |
5,960,000
|
|
|
|
|
4,160,000
|
| Number of additional shares reserved for issuance (in shares) |
1,800,000
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|
|
|
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| Stock-based compensation cost |
|
$ 5,896
|
$ 5,161
|
$ 5,883
|
|
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| Unrecognized compensation expense |
|
$ 8,103
|
|
|
|
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| Expected period of unrecognized compensation expense |
|
2 years 10 months 9 days
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|
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| Outstanding stock options (in shares) |
|
0
|
87,026
|
87,026
|
87,026
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| Restricted stock units |
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| Stock-Based Compensation (Textual) [Abstract] |
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| Conversion of common stock upon vesting (in shares) |
|
1
|
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| Service period for awards |
|
3 years
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| Restricted stock units | Board of Directors |
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| Stock-Based Compensation (Textual) [Abstract] |
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| Service period for awards |
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1 year
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| Restricted stock units | Certain executive management |
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| Stock-Based Compensation (Textual) [Abstract] |
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| Service period for awards |
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4 years
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| Performance Restricted Stock Units |
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| Stock-Based Compensation (Textual) [Abstract] |
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| Conversion of common stock upon vesting (in shares) |
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1
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| Service period for awards |
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2 years
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| Stock appreciation rights |
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| Stock-Based Compensation (Textual) [Abstract] |
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| Percentage of SARs vesting annually |
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25.00%
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| Grant expiration period |
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10 years
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