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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Basic and Diluted (Loss)/Earnings Per Common Share                      
Basic weighted average number of shares outstanding (in shares)                 40,287 39,976 39,593
Effect of dilutive securities:                      
Convertible debt (in shares) [1]                 1,311 2,176 2,176
Stock options and unvested restricted stock (in shares)                 630 433 395
Diluted average shares outstanding (in shares)                 42,228 42,585 42,164
Net earnings as reported (in dollars) $ 35,553 $ 42,550 $ 41,580 $ 23,572 $ 51,807 $ 36,887 $ 39,878 $ 20,969 $ 143,255 $ 149,541 $ 128,738
Interest attributable to convertible senior notes, net of income taxes (in dollars)                 941 1,615 1,597
Net earnings for diluted earnings per share (in dollars)                 $ 144,196 $ 151,156 $ 130,335
Basic earnings per share (in dollars per share) $ 0.88 [2] $ 1.06 [2] $ 1.03 [2] $ 0.59 [2] $ 1.29 [2] $ 0.92 [2] $ 1.00 [2] $ 0.53 [2] $ 3.56 $ 3.74 $ 3.25
Diluted earnings per share (in dollars per share) $ 0.87 [2] $ 1.02 [2] $ 0.98 [2] $ 0.56 [2] $ 1.22 [2] $ 0.88 [2] $ 0.95 [2] $ 0.50 [2] $ 3.41 [1] $ 3.55 [1] $ 3.09 [1]
Antidilutive stock options not included in the calculation of diluted earnings per share (in shares)                 2 4 0
[1] In accordance with ASC 260-10, Earnings Per Share, ("ASC 260-10") we calculate the dilutive effect of convertible securities using the "if-converted" method based on the number of days the Convertible Notes were outstanding during the 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.