EARNINGS PER SHARE (Reconciliation of the Denominators of the Basic and Diluted EPS Computations) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Basic EPS, Net Income Available to Common Stockholders (Numerator)	$ 17,956	$ 19,337	$ 37,080	$ 36,298
Basic EPS, Weighted Average Shares (Denominator)	43,693,427	43,746,583	43,674,070	43,998,929
Basic EPS, Per Share Amount (in usd per share)	$ 0.41	$ 0.44	$ 0.85	$ 0.82
Effect of dilutive stock awards, Weighted Average Shares (Denominator)	91,000	77,000	81,000	77,000
Diluted EPS, Net Income Available to Common Stockholders (Numerator)	$ 17,956	$ 19,337	$ 37,080	$ 36,298
Diluted EPS, Weighted Average Common Shares	43,783,952	43,824,183	43,755,045	44,075,706
Diluted EPS, Per Share Amount (in usd per share)	$ 0.41	$ 0.44	$ 0.85	$ 0.82