Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 150,314	$ 103,052	$ 107,182
Other comprehensive income (loss):
Change in unrealized gains on securities	46,780	2,853	(234)
Less: reclassification adjustment for gains in net income	(23,529)	0	0
Increase (decrease) in fair value of cash flow hedge	2,934	(2,032)	3,563
Less: reclassification adjustment for amounts recognized in net income	(4,498)	(4,136)	(1,346)
Net change in cash flow hedge liability	1,564	6,168	(2,217)
Total other comprehensive income (loss)	21,687	(3,315)	1,983
Comprehensive income	172,001	99,737	109,165
Less: comprehensive income attributable to noncontrolling interest	(1,452)	(1,443)	(999)
Comprehensive income attributable to common stockholders	$ 170,549	$ 98,294	$ 108,166