Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 33,109	$ 30,013
Other comprehensive income (loss):
Change in unrealized gains on securities	2,825	883
Increase (decrease) in fair value of cash flow hedge	5,480	4,242
Less: reclassification adjustment for amounts recognized in net income	1,013	956
Total other comprehensive income (loss)	(1,642)	(2,403)
Comprehensive income	31,467	27,610
Less: comprehensive income attributable to noncontrolling interest	(384)	(330)
Comprehensive income attributable to common stockholders	$ 31,083	$ 27,280