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Stock Based Compensation - Narrative (Details)
12 Months Ended
May 17, 2016
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
equity_plan
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of equity plans | equity_plan     2  
Weighted Average Grant Date Fair Value        
Weighted average grant date fair value, granted (in dollars per share) | $ / shares   $ 16.82 $ 15.53 $ 21.59
Fair values of vested restricted stock and stock options | $   $ 100,000.0 $ 200,000.0 $ 200,000
2015 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares approved   1,500,000    
Shares available for future issuance   1,491,081    
Number of Units        
Number of units, vested   6,690    
2015 Plan | Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested restricted stock units outstanding   2,229    
Restricted stock units issued 8,919      
Director | 2015 Plan | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units issued   8,919