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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Basic and Diluted (Loss)/Earnings Per Common Share                      
Basic weighted average number of shares outstanding (in shares)                 38,100 40,107 40,287
Effect of dilutive securities:                      
Convertible debt (in shares) [1]                 0 0 1,311
Stock options and unvested restricted stock (in shares)                 791 621 630
Diluted average shares outstanding (in shares)                 38,891 40,728 42,228
Net earnings as reported (in dollars) $ 103,614 $ 69,809 $ 50,828 $ 25,412 $ 75,485 $ 54,135 $ 53,838 $ 43,874 $ 249,663 $ 227,332 $ 143,255
Interest attributable to convertible senior notes, net of income taxes (in dollars)                 0 0 941
Net earnings for diluted earnings per share (in dollars)                 $ 249,663 $ 227,332 $ 144,196
Basic earnings per share (in dollars per share) $ 2.71 [2] $ 1.82 [2] $ 1.33 [2] $ 0.66 [2] $ 1.93 [2] $ 1.34 [2] $ 1.32 [2] $ 1.08 [2] $ 6.55 $ 5.67 $ 3.56
Diluted earnings per share (in dollars per share) $ 2.65 [2] $ 1.79 [2] $ 1.31 [2] $ 0.65 [2] $ 1.91 [2] $ 1.33 [2] $ 1.31 [2] $ 1.07 [2] $ 6.42 [1] $ 5.58 [1] $ 3.41 [1]
[1] In accordance with ASC 260-10, Earnings Per Share, we calculated the dilutive effect of convertible securities using the "if-converted" method based on the number of days the Convertible Notes were outstanding during the 2018 period. All of the Convertible Notes were retired in 2017.
[2] Due to the computation of earnings per share, the sum of the quarterly amounts may not equal the full-year results.