INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current income tax provision:
Federal	$ 11,717	$ 7,264	$ 4,034
State	1,321	611	273
Total	13,038	7,875	4,307
Deferred income tax (benefit)/provision:
Federal	(8,387)	(1,468)	2,113
State	(658)	(409)	154
Total	(9,045)	(1,877)	2,267
Change in valuation allowance	134	0	(16,726)
Excess tax benefit from stock-based compensation awards	617	360	784
Total provision/(benefit) for income taxes	$ 4,744	$ 6,358	$ (9,368)