EARNINGS PER SHARE (Reconciliation of the Denominators of the Basic and Diluted EPS Computations) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Basic EPS, Net Income Available to Common Stockholders (Numerator)	$ 20,658	$ 20,401	$ 57,737	$ 56,699
Basic EPS, Weighted Average Shares (Denominator)	43,706,635	43,565,937	43,685,045	43,853,548
Basic EPS, Per Share Amount (in usd per share)	$ 0.47	$ 0.47	$ 1.32	$ 1.29
Effect of dilutive stock awards, Weighted Average Shares (Denominator)	85,000	189,000	83,000	114,000
Diluted EPS, Net Income Available to Common Stockholders (Numerator)	$ 20,658	$ 20,401	$ 57,737	$ 56,699
Diluted EPS, Weighted Average Common Shares	43,792,058	43,754,915	43,767,502	43,967,725
Diluted EPS, Per Share Amount (in usd per share)	$ 0.47	$ 0.47	$ 1.32	$ 1.29