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Stock-Based Compensation Plans - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   $ 5,873 $ 5,352 $ 4,733  
Additional stock-based compensation   $ 1,000 $ 500 $ 500  
Options vested (in shares)   2,467,000 2,703,000 2,600,000  
Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage   7.00%      
Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage   8.00%      
Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   $ 2,400 $ 1,700 $ 2,100  
Share price (USD per share)   $ 7.50 $ 7.79 $ 7.79  
Unrecognized stock-based compensation on options   $ 5,600 $ 5,800 $ 2,900  
Period for recognition of compensation expense   2 years 9 months 6 days 2 years 4 months 24 days 2 years 7 months 6 days  
Stock Option | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   4 years      
Options Outstanding - Weighted-Average Life   1 year      
Stock Option | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   5 years      
Options Outstanding - Weighted-Average Life   5 years      
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   $ 3,500 $ 3,600 $ 2,600  
Unrecognized stock-based compensation on options   $ 6,900 $ 8,900 $ 4,500  
Period for recognition of compensation expense   2 years 8 months 6 days 2 years 4 months 24 days 2 years 10 months 24 days  
Restricted Stock | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   0 years      
Restricted Stock | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   5 years      
2006 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized (in shares) 2,200,000        
Additional shares authorized (in shares) 7,850,000       5,650,000