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EARNINGS PER 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 EPS Calculation        
Net income available for common stock $ 20,419 $ 20,623 $ 111,254 $ 97,079
Weighted Average Number of Shares Outstanding, Basic 52,692 52,553 52,648 52,565
Earnings Per Share, Basic $ 0.39 $ 0.39 $ 2.11 $ 1.85
Diluted EPS Calculation        
Net income available for common stock $ 20,419 $ 20,623 $ 111,254 $ 97,079
Effect of dilutive securities on income $ 0 $ 0 $ 0 $ 0
Effect of dilutive securities on shares 207 416 250 447
Weighted Average Number of Shares Outstanding, Diluted 52,899 52,969 52,898 53,012
Earnings Per Share, Diluted $ 0.39 $ 0.39 $ 2.10 $ 1.83