Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 16,705	$ 7,888
Other comprehensive loss:
Change in unrealized loss on valuation of interest rate swap agreements	(19,371)	0
Other comprehensive loss	(19,371)	0
Comprehensive income (loss)	(2,666)	7,888
Net income attributable to non-controlling interests and private perpetual preferred unitholders	(9,277)	(4,750)
Other comprehensive loss attributable to non-controlling interests	10,640	0
Comprehensive income (loss) attributable to common stockholders	$ (1,303)	$ 3,138