PRO FORMA FINANCIAL INFORMATION (UNAUDITED) - Schedule of Pro Forma Information (Details) - Series of Individually Immaterial Business Acquisitions [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition, Pro Forma Information [Abstract]
Revenues	$ 266,727	$ 276,978
Depreciation and amortization	70,316	74,101
Net income attributable to common stockholders	$ 65,530	$ 99,004
Net income attributable to common stockholders, per:
Basic common share (in dollars per share)	$ 1.00	$ 1.59
Diluted common share (in dollars per share)	$ 1.00	$ 1.59
Weighted-average number of common shares outstanding, basic (in shares)	65,284,251	62,235,014
Weighted-average number of common shares outstanding, diluted (in shares)	65,520,672	62,460,239