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NET INCOME PER SHARE (Basic and Diluted Net Income Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Basic net income per share:                      
Net income $ 15,319,000 $ (27,610,000) $ 29,736,000 $ 32,756,000 $ 25,138,000 $ 13,295,000 $ 11,376,000 $ 10,992,000 $ 50,201,000 $ 60,801,000 $ 64,743,000
Weighted average common shares outstanding - Basic (in shares)                 85,637 82,857 76,897
Basic (in dollars per share) $ 0.18 $ (0.32) $ 0.35 $ 0.38 $ 0.29 $ 0.16 $ 0.14 $ 0.14 $ 0.59 $ 0.73 $ 0.84
Diluted net income per share:                      
Net income $ 15,319,000 $ (27,610,000) $ 29,736,000 $ 32,756,000 $ 25,138,000 $ 13,295,000 $ 11,376,000 $ 10,992,000 $ 50,201,000 $ 60,801,000 $ 64,743,000
Weighted average common shares outstanding - Basic (in shares)                 85,637 82,857 76,897
Effect of dilutive securities:                      
Warrants (in shares)                 0 0 971
Stock options and restricted stock (in shares)                 857 1,142 1,253
Weighted average common shares for diluted earnings per share (in shares)                 86,494 83,999 79,121
Diluted (in dollars per share) $ 0.18 $ (0.32) $ 0.34 $ 0.38 $ 0.29 $ 0.15 $ 0.14 $ 0.14 $ 0.58 $ 0.72 $ 0.82