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	$ 152,716	$ 150,314	$ 103,052
Other comprehensive income (loss):
Change in unrealized gains on securities	5,072	46,780	2,853
Less: reclassification adjustment for gains in net income	(29,673)	(23,529)	0
Net change in unrealized gains on securities	(24,601)	23,251	2,853
Increase (decrease) in fair value of cash flow hedge	(1,506)	(6,062)	(10,304)
Less: reclassification adjustment for amounts recognized in net income	3,928	4,498	4,136
Net change in cash flow hedge liability	(2,422)	1,564	6,168
Total other comprehensive income (loss)	(22,179)	21,687	(3,315)
Comprehensive income	130,537	172,001	99,737
Less: comprehensive income attributable to noncontrolling interest	(1,176)	(1,452)	(1,443)
Comprehensive income attributable to common stockholders	$ 129,361	$ 170,549	$ 98,294