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Stock-Based Compensation - Narrative (Details)
 12 Months Ended
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