Income Taxes - Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current-
Federal	$ 32,721	$ 27,564	$ 13,402
State and Puerto Rico	4,683	4,065	2,810
Total	37,404	31,629	16,212
Deferred-
Federal	(2,101)	(1,481)	(308)
State and Puerto Rico	862	1,076	(4,290)
Total	(1,239)	(405)	(4,598)
Provision for income taxes	$ 36,165	$ 31,224	$ 11,614