Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 107,250	$ 79,928	$ 70,210
Other comprehensive loss:
Unrealized loss on valuation of interest rate swap agreements	(3,054)	(1,922)	0
Other comprehensive loss	(3,054)	(1,922)	0
Comprehensive income	104,196	78,006	70,210
Net income attributable to non-controlling interests and private perpetual preferred unitholders	(55,794)	(46,198)	(43,543)
Other comprehensive loss attributable to non-controlling interests	1,576	1,100	0
Comprehensive income attributable to common stockholders	$ 49,978	$ 32,908	$ 26,667