Annual report pursuant to Section 13 and 15(d)

EARNINGS PER SHARE - Schedule of Basic and Diluted Earnings per Common Share (Details)

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EARNINGS PER SHARE - Schedule of Basic and Diluted Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ 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, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic and Diluted (Loss)/Earnings Per Common Share                      
Basic weighted average number of shares outstanding (in shares)                 37,718 38,100 40,107
Effect of dilutive securities:                      
Stock options and unvested restricted stock (in shares)                 766 791 621
Diluted average shares outstanding (in shares)                 38,484 38,891 40,728
Net earnings as reported (in dollars) $ 152,527 $ 109,118 $ 90,678 $ 71,152 $ 103,614 $ 69,809 $ 50,828 $ 25,412 $ 423,475 $ 249,663 $ 227,332
Basic earnings per share (in dollars per share) $ 4.06 [1] $ 2.90 [1] $ 2.41 [1] $ 1.87 [1] $ 2.71 [1] $ 1.82 [1] $ 1.33 [1] $ 0.66 [1] $ 11.23 $ 6.55 $ 5.67
Diluted earnings per share (in dollars per share) $ 3.97 [1] $ 2.84 [1] $ 2.38 [1] $ 1.83 [1] $ 2.65 [1] $ 1.79 [1] $ 1.31 [1] $ 0.65 [1] $ 11.00 $ 6.42 $ 5.58
[1] Due to the computation of earnings per share, the sum of the quarterly amounts may not equal the full-year results.