Quarterly report pursuant to Section 13 or 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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Basic and Diluted Earnings Per Common Share        
Basic weighted average number of shares outstanding 40,647 40,317 40,568 40,248
Effect of dilutive securities:        
Convertible debt [1] 0 1,991 0 2,083
Unvested restricted stock 517 473 625 505
Diluted average shares outstanding 41,164 42,781 41,193 42,836
Net earnings as reported (in dollars) $ 53,838 $ 41,580 $ 97,712 $ 65,152
Interest attributable to convertible senior notes, net of income taxes (in dollars) 0 354 [1] 0 739 [1]
Net earnings for diluted earnings per share (in dollars) $ 53,838 $ 41,934 $ 97,712 $ 65,891
Basic earnings per share (in dollars per share) $ 1.32 $ 1.03 $ 2.41 $ 1.62
Diluted earnings per share (in dollars per share) [1] $ 1.31 $ 0.98 $ 2.37 $ 1.54
Antidilutive stock not included in the calculation of diluted earnings per share 1 59 1 2
[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 our Convertible Notes were outstanding during the period. All of the Convertible Notes were retired in the second half of 2017.