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Basis of Presentation - Calculations of Basic and Diluted Earnings per Share (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 14, 2017
$ / shares
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
Accounting Policies [Abstract]            
Dividends declared (in dollars per share) | $ / shares $ 0.25 $ 0.25 $ 0 $ 0.25 $ 0  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Net income | $   $ 6,408 $ 7,860 $ 15,096 $ 12,236 $ 97,700
Less: Undistributed income allocated to participating securities | $   45 83 140 109  
Income attributable to common stockholders | $   $ 6,363 $ 7,777 $ 14,956 $ 12,127  
Basic weighted-average common shares outstanding (in shares)   21,866 21,875 21,961 21,895  
Add: dilutive effect of equity instruments (in shares)   14 312 20 309  
Diluted weighted-average shares outstanding (in shares)   21,880 22,187 21,981 22,204  
Earnings per share - basic (in dollars per share) | $ / shares   $ 0.29 $ 0.36 $ 0.68 $ 0.55  
Earnings per share - diluted (in dollars per share) | $ / shares   $ 0.29 $ 0.35 $ 0.68 $ 0.55  
Performance share units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total shares excluded from diluted shares outstanding   400 400 200 200  
Performance share units | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Range of contingent right to receive a common stock       0    
Performance share units | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Range of contingent right to receive a common stock       2    
Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total shares excluded from diluted shares outstanding   200 200 200 200