ACQUISITIONS, DIVESTITURE AND PRO FORMA RESULTS (Pro Forma Financial Information Summarization Results of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Business Combinations [Abstract]
Total revenue from continuing operations	$ 1,428,491	$ 1,446,903
Net income from continuing operations	$ 81,730	$ 27,520
Basic earnings per share from continuing operations (in dollars per share)	$ 1.06	$ 0.37