CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
BALANCE at Dec. 31, 2013	$ 52,157	$ 29	$ 24,095	$ (1,586)	$ 29,611	$ 8
BALANCE (in Shares) at Dec. 31, 2013		28,866
Net income	19,311	$ 0	0	0	19,311	0
Share-based compensation expense	5,651	$ 0	5,651	0	0	0
Share-based compensation expense (in Shares)		92
Exercise of stock options	314	$ 0	314	0	0	0
Exercise of stock options (in Shares)		32
Equity compensation awards, net	(68)	$ 0	(68)	0	0	0
Cash dividends	(20,370)	0	0	0	(20,370)	0
Employee tax withholdings related to the vesting of equity awards	(1,476)	0	0	(1,476)	0	0
Other comprehensive loss, net of tax	(4)	0	0	0	0	(4)
BALANCE at Dec. 31, 2014	55,515	$ 29	29,992	(3,062)	28,552	4
BALANCE (in Shares) at Dec. 31, 2014		28,990
Net income	26,143	$ 0	0	0	26,143	0
Share-based compensation expense	5,468	$ 0	5,468	0	0	0
Share-based compensation expense (in Shares)		296
Exercise of stock options	3,182	$ 0	3,182	0	0	0
Exercise of stock options (in Shares)		335
Equity compensation awards, net	2,750	$ 0	2,750	0	0	0
Cash dividends	(20,504)	0	0	0	(20,504)	0
Employee tax withholdings related to the vesting of equity awards	(2,610)	0	0	(2,610)	0	0
Other comprehensive loss, net of tax	(16)	0	0	0	0	(16)
BALANCE at Dec. 31, 2015	$ 69,928	$ 29	41,392	(5,672)	34,191	(12)
BALANCE (in Shares) at Dec. 31, 2015	29,621	29,621
Net income	$ 35,469	$ 0	0	0	35,469	0
Share-based compensation expense	6,970	$ 1	6,969	0	0	0
Share-based compensation expense (in Shares)		296
Exercise of stock options	2,760	$ 0	2,760	0	0	0
Exercise of stock options (in Shares)		286
Equity compensation awards, net	2,936	$ 0	2,936	0	0	0
Cash dividends	(20,861)	0	0	0	(20,861)	0
Employee tax withholdings related to the vesting of equity awards	(2,657)	0	0	(2,657)	0	0
Other comprehensive loss, net of tax	(21)	0	0	0	0	(21)
BALANCE at Dec. 31, 2016	$ 94,524	$ 30	$ 54,057	$ (8,329)	$ 48,799	$ (33)
BALANCE (in Shares) at Dec. 31, 2016	30,203	30,203