Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income
Net income	$ 86,477	$ 76,907	$ 67,925
Other comprehensive (loss) income:
Change in unrealized net gain on available-for-sale securities	(5,273)	(1,455)	13,124
Change in value of interest rate cap	133	0	(189)
Comprehensive income	$ 81,337	$ 75,452	$ 80,860