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Stock-Based Compensation - Narrative (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) employee $ / shares shares | Dec. 31, 2015 USD ($) employee $ / shares shares | Dec. 31, 2014 USD ($) employee $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of employees affected | employee | 27 | 37 | 17
Net increase in share-based compensation | $ 400,000 | $ 3,400,000 | $ 1,000,000
Stock-based compensation | 2,762,000 | 6,462,000 | 4,712,000
Stock-based compensation expense | 2,868,000 | 7,204,000 | 4,712,000
Reclassification and settlement of equity awards | 899,000 |  | 501,000
Additional Paid-in Capital |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation | 2,762,000 | $ 6,462,000 | 4,712,000
Reclassification and settlement of equity awards | $ 899,000 |  | $ 501,000
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Expected term (in years) | 2 years 7 months 6 days | 5 years | 5 years
Contractual term | 5 years |  |
Expiration period | 5 years |  |
Weighted-average grant-date fair value | $ 500,000 | $ 800,000 | $ 600,000
Intrinsic value of options exercised | 0 | 0 | 4,900,000
Shares issued as a result of options exercised | 0 | 0 | 6,100,000
Stock-based compensation expense | $ 285,000 | $ 658,000 | $ 117,000
Restricted stock awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of employees affected | employee | 27 | 37 | 17
Aggregate weighted average grant-date fair value of share granted | $ 2,700,000 | $ 1,900,000 | $ 2,800,000
Fair value of shares vested | 2,100,000 | 2,900,000 | 1,900,000
Stock-based compensation expense | $ 2,021,000 | $ 2,909,000 | $ 2,612,000
Exercise price (in usd per share) | $ / shares | $ 11.96 | $ 17.51 | $ 15.75
Restricted stock awards | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Restricted stock awards | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 5 years |  |
Restricted stock awards | Employees |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares accelerated, number (in shares) | shares | 42,852 | 95,088 | 55,106
Stock-based compensation | $ 300,000 | $ 1,200,000 | $ 1,000,000
Stock appreciation rights |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Expected term (in years) | 5 years | 5 years |
Aggregate weighted average grant-date fair value of share granted | $ 0 | $ 0 |
Stock-based compensation expense | $ 106,000 | $ 742,000 | $ 0
Exercise price (in usd per share) | $ / shares | $ 0.00 | $ 0.00 |
Stock appreciation rights | Executive Officer |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 500,000 |  |
Exercise price (in usd per share) | $ / shares | $ 13.87 |  |
Performance share units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expected term (in years) |  | 3 years | 3 years
Service period | 3 years |  |
Net increase in share-based compensation | $ 100,000 | $ 2,100,000 | $ 200,000
Aggregate weighted average grant-date fair value of share granted | 0 | 1,400,000 | 2,200,000
Stock-based compensation expense | $ 456,000 | $ 2,895,000 | $ 1,983,000
Exercise price (in usd per share) | $ / shares | $ 26.87 | $ 30.52 | $ 0.00
Other matters |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cash received from share-based payment exercises | $ 0 | $ 0 | $ 200,000
2005 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares reserved for issuance (in shares) | shares | 180,000 |  |
2005 Plan | Stock compensation plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum number of shares per employee (in shares) | shares | 2,000 |  |
Shares reserved for issuance (in shares) | shares | 100,000 |  |
2005 Plan | Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum number of shares per employee (in shares) | shares | 10,000 |  |
Shares reserved for issuance (in shares) | shares | 80,000 |  |
Vesting period | 3 years |  |
2007 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum number of shares per employee (in shares) | shares | 400,000 |  |
Shares authorized for issuance (in shares) | shares | 3,600,000 |  |
Maximum number of common shares to be received by participant, percent | 200.00% |  |
Maximum reduction in number of common shares to be received by participants, percent | 0.00% |  |
Percent of award based on performance of total stockholder return | 75.00% |  |
2007 Plan | Non-management Director |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum number of shares per employee (in shares) | shares | 50,000 |  |
2010 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares reserved for issuance (in shares) | shares | 600,000 |  |
401 (k) Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares reserved for issuance (in shares) | shares | 600,000 |  |

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