Condensed Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 26,085	$ 22,734	$ 60,558	$ 59,246
Other comprehensive income (loss):
Unrealized loss on valuation of interest rate swap agreements	(4,384)	0	(4,384)	0
Other comprehensive loss	(4,384)	0	(4,384)	0
Comprehensive income	21,701	22,734	56,174	59,246
Comprehensive income attributable to non-controlling interests	(12,151)	(14,171)	(31,897)	(36,480)
Comprehensive income attributable to common stockholders	$ 9,550	$ 8,563	$ 24,277	$ 22,766