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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, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Net income $ 27,280 $ 20,534 $ 20,427 $ 30,844 $ 34,937 $ 68,936 $ 20,359 $ 68,241 $ 124,232
Less income allocated to non-controlling interests (88)       (17)     (257) (17)
Less income allocated to participating securities:                  
Non-forfeitable dividends on participating securities (93)       (89)     (279) (268)
Income allocated to participating securities (19)       (49)     (19) (236)
Total net income allocated to participating securities (112)       (138)     (298) (504)
Net income available to common stockholders 27,080       34,782     67,686 123,711
Effect of dilutive securities:                  
Participating securities         138       504
Net income for diluted net income per share $ 27,080       $ 34,920     $ 67,686 $ 124,215
Reconciliation of shares                  
Shares for basic net income per share 39,586       39,487     39,565 39,470
Effect of dilutive securities: (Shares)                  
Total effect of dilutive securities (in shares) 379       378     379 375
Shares for diluted net income per share 39,965       39,865     39,944 39,845
Basic (in dollars per share) $ 0.68       $ 0.88     $ 1.71 $ 3.13
Diluted (in dollars per share) $ 0.68       $ 0.88     $ 1.69 $ 3.12
Stock options                  
Effect of dilutive securities: (Shares)                  
Stock options and performance-based stock units (in shares) 4       4     4 3
Performance-based stock units                  
Effect of dilutive securities: (Shares)                  
Stock options and performance-based stock units (in shares) 375       217     375 217
Participating Securities                  
Effect of dilutive securities: (Shares)                  
Participating securities         157       155