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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, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Net income $ 20,534 $ 20,427 $ 30,844 $ 34,937 $ 68,936 $ 20,359 $ 40,961 $ 89,295
Less income allocated to non-controlling interests (88)           (169)  
Less income allocated to participating securities:                
Non-forfeitable dividends on participating securities (94)       (91)   (186) (179)
Income allocated to participating securities         (187)     (187)
Total net income allocated to participating securities (94)       (278)   (186) (366)
Net income available to common stockholders 20,352       68,658   40,606 88,929
Effect of dilutive securities:                
Participating securities         278     366
Net income for diluted net income per share $ 20,352       $ 68,936   $ 40,606 $ 89,295
Reconciliation of shares                
Shares for basic net income per share 39,577       39,471   39,555 39,461
Effect of dilutive securities: (Shares)                
Total effect of dilutive securities (in shares) 192       294   192 289
Shares for diluted net income per share 39,769       39,765   39,747 39,750
Basic (in dollars per share) $ 0.51       $ 1.74   $ 1.03 $ 2.25
Diluted (in dollars per share) $ 0.51       $ 1.73   $ 1.02 $ 2.25
Stock options                
Effect of dilutive securities: (Shares)                
Stock options and performance-based stock units (in shares) 5       2   5 2
Performance-based stock units                
Effect of dilutive securities: (Shares)                
Stock options and performance-based stock units (in shares) 187       132   187 132
Participating Securities                
Effect of dilutive securities: (Shares)                
Participating securities         160     155