Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 33,438	$ 33,977	$ 111,528	$ 95,528
Other comprehensive income (loss):
Change in unrealized gains on securities	119	462	7,576	(378)
Less: reclassification adjustment for gains in net income	0	(61)	(23,498)	(61)
Increase (decrease) in fair value of cash flow hedge	(1,287)	5,266	6,525	8,227
Less: reclassification adjustment for amounts recognized in net income	(975)	1,185	2,993	3,318
Total other comprehensive income (loss)	431	(3,680)	(19,454)	(5,348)
Comprehensive income	33,869	30,297	92,074	90,180
Less: comprehensive income attributable to noncontrolling interest	(406)	(377)	(1,176)	(1,062)
Comprehensive income attributable to common stockholders	$ 33,463	$ 29,920	$ 90,898	$ 89,118