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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Net income $ 20,616 $ 22,411 $ 67,506 $ 64,449
Less net income allocated to participating securities:        
Nonforfeitable dividends on participating securities (80) (85) (269) (284)
Income allocated to participating securities   (5) (12) (12)
Total net income allocated to participating securities (80) (90) (281) (296)
Net income available to common stockholders 20,536 22,321 67,225 64,153
Effect of dilutive securities:        
Participating securities 80 90 281 296
Net income for diluted net income per share $ 20,616 $ 22,411 $ 67,506 $ 64,449
Reconciliation of shares        
Shares for basic net income per share 39,428 39,057 39,403 38,161
Effect of dilutive securities: (Shares)        
Total effect of dilutive securities (in shares) 320 278 335 294
Shares for diluted net income per share 39,748 39,335 39,738 38,455
Basic (in dollars per share) $ 0.52 $ 0.57 $ 1.71 $ 1.68
Diluted (in dollars per share) $ 0.52 $ 0.57 $ 1.70 $ 1.68
Stock options        
Effect of dilutive securities: (Shares)        
Stock options and performance-based stock units (in shares) 9 13 11 13
Performance-based stock units        
Effect of dilutive securities: (Shares)        
Stock options and performance-based stock units (in shares) 170 108 170 108
Participating Securities        
Effect of dilutive securities: (Shares)        
Participating securities 141 157 154 173