CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (loss) [Member]	Retained Earnings [Member]
Beginning Balance at Dec. 31, 2013	$ 296,091	$ 0	$ 210	$ 161,202	$ 0	$ 134,679
Beginning Balance (in shares) at Dec. 31, 2013			21,223
Net income	36,544	0	$ 0	0	0	36,544
Stock issued under compensation plans, net	1,064	0	$ 3	1,061	0	0
Stock issued under compensation plans, net (in shares)			253
Tax benefit from stock-based awards	592	0	$ 0	592	0	0
Stock-based compensation expense	4,671	0	0	4,671	0	0
Shares repurchased	(16,447)	0	$ (7)	(16,440)	0	0
Shares repurchased (in shares)			(686)
Reclassification of other comprehensive income	0	0	$ 0	(13)	13	0
Other comprehensive income (loss)	13
Stock issued - other	38	0	$ 0	38	0	0
Stock issued - other (in shares)			2
Ending Balance at Dec. 31, 2014	322,553	0	$ 206	151,111	13	171,223
Ending Balance (in shares) at Dec. 31, 2014			20,792
Net income	27,302	0	$ 0	0	0	27,302
Stock issued under compensation plans, net	1,923	0	$ 4	1,919	0	0
Stock issued under compensation plans, net (in shares)			413
Tax benefit from stock-based awards	1,612	0	$ 0	1,612	0	0
Stock-based compensation expense	4,837	0	0	4,837	0	0
Shares repurchased	(28,478)	0	$ (12)	(12,130)	0	(16,336)
Shares repurchased (in shares)			(1,236)
Other comprehensive income (loss)	103	0	$ 0	0	103	0
Reclassification of shares repurchased	0	0	0	13,965	0	(13,965)
Stock issued - other	28	0	0	28	0	0
Ending Balance at Dec. 31, 2015	329,880	0	$ 198	161,342	116	168,224
Ending Balance (in shares) at Dec. 31, 2015			19,969
Net income	21,431	0	$ 0	0	0	21,431
Stock issued under compensation plans, net	6,219	0	$ 6	6,213	0	0
Stock issued under compensation plans, net (in shares)			589
Tax benefit from stock-based awards	2,044	0	$ 0	2,044	0	0
Stock-based compensation expense	4,674	0	0	4,674	0	0
Shares repurchased	(100,587)	0	$ (42)	(34,235)	0	(66,310)
Shares repurchased (in shares)			(4,228)
Other comprehensive income (loss)	(549)	0	$ 0	0	(549)	0
Stock issued - other	62	0	$ 0	62	0	0
Stock issued - other (in shares)			3
Ending Balance at Dec. 31, 2016	$ 263,174	$ 0	$ 162	$ 140,100	$ (433)	$ 123,345
Ending Balance (in shares) at Dec. 31, 2016			16,333