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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Numerator        
Net (loss) income available to common stockholders (in US dollars) $ (83,689) $ 83,972 $ (8,024) $ 156,382
Denominator        
Weighted average shares outstanding used to compute basic (loss) earnings per common share (in shares) 54,937,038 56,181,864 55,467,799 56,175,219
Effect of dilutive securities-Share-based awards (in shares) 0 317,650 0 286,758
Shares used to compute diluted (loss) earnings per common share (in shares) 54,937,038 56,499,514 55,467,799 56,461,977
Basic (loss) earnings per common share (in US dollars per share) $ (1.52) $ 1.49 $ (0.14) $ 2.78
Diluted (loss) earnings per common share (in US dollars per share) $ (1.52) $ 1.49 $ (0.14) $ 2.77
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) 197,470 0 200,538 25,061
Assuming dilution, anti-dilutive share-based awards excluded from calculation of diluted earnings per share (in shares) 94,355   94,355