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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Net income (loss) $ 25,377 $ 22,180 $ 46,890 $ 42,038
Less net income allocated to participating securities:        
Nonforfeitable dividends on participating securities (92) (98) (189) (199)
Income allocated to participating securities (12) (7) (12) (7)
Total net income allocated to participating securities (104) (105) (201) (206)
Net income available to common stockholders 25,273 22,075 46,689 41,832
Effect of dilutive securities:        
Participating securities 104 105 201  
Net income for diluted net income per share $ 25,377 $ 22,180 $ 46,890 $ 41,832
Reconciliation of shares        
Shares for basic net income per share 39,414 37,969 39,390 37,707
Effect of dilutive securities: (Shares)        
Total effect of dilutive securities (in shares) 380 195 379 13
Shares for diluted net income per share 39,794 38,164 39,769 37,720
Basic (in dollars per share) $ 0.64 $ 0.58 $ 1.19 $ 1.11
Diluted (in dollars per share) $ 0.64 $ 0.58 $ 1.18 $ 1.11
Stock options        
Effect of dilutive securities: (Shares)        
Stock options and performance-based stock units (in shares) 11 13 11 13
Performance-based stock units        
Effect of dilutive securities: (Shares)        
Stock options and performance-based stock units (in shares) 207   207  
Participating Securities        
Effect of dilutive securities: (Shares)        
Participating securities 162 182 161