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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
SHARE-BASED COMPENSATION                      
Net income $ 10,932 $ 12,206 $ 12,335 $ 10,395 $ 13,265 $ 8,230 $ 9,150 $ 9,808 $ 45,868 $ 40,453 $ 172,075
Weighted average shares outstanding - basic (in shares)                 32,238,000 37,366,000 41,961,000
Dilutive effect of Treasury warrants (in shares)                 0 0 14,000
Weighted average shares outstanding - diluted (in shares)                 32,651,000 37,937,000 42,317,000
Basic earnings per share (in dollars per share) $ 0.35 $ 0.39 $ 0.39 $ 0.30 $ 0.37 $ 0.23 $ 0.25 $ 0.23 $ 1.42 $ 1.08 $ 4.10
Diluted earnings per share (in dollars per share) $ 0.34 $ 0.38 $ 0.39 $ 0.29 $ 0.37 $ 0.23 $ 0.25 $ 0.23 $ 1.40 $ 1.07 $ 4.07
Antidilutive securities excluded from the dilutive share calculation (in shares)                 8,217 13,510 24,526
Stock Option                      
SHARE-BASED COMPENSATION                      
Dilutive effect of share-based compensation arrangements (in shares)                 413,000 571,000 341,000
Restricted Stock Awards and Units                      
SHARE-BASED COMPENSATION                      
Dilutive effect of share-based compensation arrangements (in shares)                 0 0 1,000