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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator        
Net income available to common stockholders (in US dollars) $ 61,186 $ 81,834 $ 53,162 $ 238,216
Denominator        
Weighted average shares outstanding used to compute basic earnings per common share (in shares) 54,979,310 56,216,840 55,302,385 56,189,388
Effect of dilutive securities-Share-based awards (in shares) 220,935 341,610 207,337 305,042
Shares used to compute diluted earnings per common share (in shares) 55,200,245 56,558,450 55,509,722 56,494,430
Basic earnings per common share (in US dollars per share) $ 1.11 $ 1.46 $ 0.96 $ 4.24
Diluted earnings per common share (in US dollars per share) $ 1.11 $ 1.45 $ 0.96 $ 4.22
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive share-based awards excluded from calculation of diluted earnings per share (in shares) 19,450 0 94,155 0