Condensed Consolidated Unaudited Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 18,945	$ 17,293	$ 38,999	$ 33,291
Other comprehensive (loss) income:
Unrealized (loss) gain on interest rate swaps	(4,821)	274	(17,286)	(3,692)
Amount of loss reclassified from other comprehensive (loss) income into income as interest expense	2,265	1,284	4,587	2,575
Total other comprehensive (loss) income	(2,556)	1,558	(12,699)	(1,117)
Comprehensive income	16,389	18,851	26,300	32,174
Comprehensive income allocated to noncontrolling interest	33	68	67	51
Comprehensive income attributable to the Company	$ 16,356	$ 18,783	$ 26,233	$ 32,123