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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, 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, numerator:                      
Net income $ 36,568 $ 14,788 $ 15,777 $ (7,407) $ 1,584 $ 12,940 $ 10,231 $ (6,103) $ 59,726 $ 18,652 $ 44,854
Effect of unvested restricted stock unit awards                 (238) (138) (450)
Adjusted net income                 $ 59,488 $ 18,514 $ 44,404
Basic, denominator:                      
Weighted-average shares 25,637,568 25,671,535 25,767,791 25,684,475 25,669,280 25,724,550 25,791,026 25,822,522 25,683,745 25,751,544 26,013,716
Earnings per common share (in dollars per share) $ 1.42 $ 0.57 $ 0.61 $ (0.29) $ 0.06 $ 0.50 $ 0.39 $ (0.24) $ 2.32 $ 0.72 $ 1.71
Diluted, numerator:                      
Net income $ 36,568 $ 14,788 $ 15,777 $ (7,407) $ 1,584 $ 12,940 $ 10,231 $ (6,103) $ 59,726 $ 18,652 $ 44,854
Effect of unvested restricted stock unit awards                 (233) (137) (443)
Adjusted net income                 $ 59,493 $ 18,515 $ 44,411
Diluted, denominator:                      
Weighted-average shares 25,637,568 25,671,535 25,767,791 25,684,475 25,669,280 25,724,550 25,791,026 25,822,522 25,683,745 25,751,544 26,013,716
Effect of dilutive securities                 740,644 505,026 516,411
Adjusted weighted-average shares and assumed conversions 26,540,716 26,393,359 26,291,641 25,684,475 26,272,487 26,211,524 26,246,868 25,822,522 26,424,389 26,256,570 26,530,127
Earnings per common share (in dollars per share) $ 1.37 $ 0.56 $ 0.60 $ (0.29) $ 0.06 $ 0.49 $ 0.39 $ (0.24) $ 2.25 $ 0.71 $ 1.67