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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net income $ 68,936 $ 25,377 $ 89,295 $ 46,890
Less net income allocated to participating securities:        
Nonforfeitable dividends on participating securities (91) (92) (179) (189)
Income allocated to participating securities (187) (12) (187) (12)
Total net income allocated to participating securities (278) (104) (366) (201)
Net income available to common stockholders 68,658 25,273 88,929 46,689
Effect of dilutive securities:        
Participating securities 278 104 366 201
Net income for diluted net income per share $ 68,936 $ 25,377 $ 89,295 $ 46,890
Reconciliation of shares        
Shares for basic net income per share 39,471 39,414 39,461 39,390
Effect of dilutive securities: (Shares)        
Total effect of dilutive securities (in shares) 294 380 289 379
Shares for diluted net income per share 39,765 39,794 39,750 39,769
Basic (in dollars per share) $ 1.74 $ 0.64 $ 2.25 $ 1.19
Diluted (in dollars per share) $ 1.73 $ 0.64 $ 2.25 $ 1.18
Stock options        
Effect of dilutive securities: (Shares)        
Stock options and performance-based stock units (in shares) 2 11 2 11
Performance-based stock units        
Effect of dilutive securities: (Shares)        
Stock options and performance-based stock units (in shares) 132 207 132 207
Participating Securities        
Effect of dilutive securities: (Shares)        
Participating securities 160 162 155 161