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EARNINGS PER SHARE (Basic and Diluted) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Basic, numerator:                      
Net income $ 15,299 $ 40,776 $ 1,233 $ 9,954 $ 36,568 $ 14,788 $ 15,777 $ (7,407) $ 67,262 $ 59,726 $ 18,652
Effect of unvested restricted stock unit awards                 (150) (238) (138)
Adjusted net income                 $ 67,112 $ 59,488 $ 18,514
Basic, denominator:                      
Weighted-average shares 25,707,335 25,697,509 25,670,325 25,642,871 25,637,568 25,671,535 25,767,791 25,684,475 25,679,736 25,683,745 25,751,544
Earnings per common share (in dollars per share) $ 0.59 $ 1.58 $ 0.05 $ 0.39 $ 1.42 $ 0.57 $ 0.61 $ (0.29) $ 2.61 [1] $ 2.32 [1] $ 0.72 [1]
Diluted, numerator:                      
Net income $ 15,299 $ 40,776 $ 1,233 $ 9,954 $ 36,568 $ 14,788 $ 15,777 $ (7,407) $ 67,262 $ 59,726 $ 18,652
Effect of unvested restricted stock unit awards                 (145) (233) (137)
Adjusted net income                 $ 67,117 $ 59,493 $ 18,515
Diluted, denominator:                      
Weighted-average shares 25,707,335 25,697,509 25,670,325 25,642,871 25,637,568 25,671,535 25,767,791 25,684,475 25,679,736 25,683,745 25,751,544
Effect of dilutive securities                 1,019,095 740,644 505,026
Adjusted weighted-average shares and assumed conversions 26,682,262 26,795,659 26,699,549 26,596,376 26,540,716 26,393,359 26,291,641 25,684,475 26,698,831 26,424,389 26,256,570
Earnings per common share (in dollars per share) $ 0.57 $ 1.52 $ 0.05 $ 0.37 $ 1.37 $ 0.56 $ 0.60 $ (0.29) $ 2.51 $ 2.25 $ 0.71
[1] The Company uses the twoclass method for calculating earnings per share. See Note L.