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PER SHARE OF COMMON STOCK - Calculation of Basic and Diluted Per Share Of Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic net (loss) income per share:                              
Net (loss) income applicable to common stockholders                         $ (97,412) $ 89,575 $ 69,421
Weighted average common shares outstanding (in shares)                         52,945,000 54,695,000 56,996,000
Basic net (loss) income per share (in usd per share) $ 0.10 $ 0.07 $ 0 $ (2.01) $ 0.34 $ 0.47 $ 0.56 $ 0.27 $ 0.21 $ 0.08 $ 0.55 $ 0.37 $ (1.84) $ 1.64 $ 1.22
Diluted net (loss) income per share:                              
Net (loss) income applicable to common stockholders                         $ (97,412) $ 89,575 $ 69,421
Weighted average common shares outstanding (in shares)                         52,945,000 54,695,000 56,996,000
Dilutive shares from assumed conversion of convertible senior notes (in shares)                         0 0 455,000
Dilutive stock options and restricted stock (in shares)                         0 595,000 979,000
Diluted weighted average common shares outstanding (in shares)                         52,945,000 55,290,000 58,430,000
Diluted net (loss) income per share (in usd per share) $ 0.10 $ 0.07 $ 0 $ (2.01) $ 0.34 $ 0.46 $ 0.56 $ 0.27 $ 0.21 $ 0.08 $ 0.54 $ 0.35 $ (1.84) $ 1.62 $ 1.19