CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Balance at Dec. 31, 2012	$ 254,690	$ 0	$ 206	$ 154,564	$ 99,920	$ 0
Balance (in shares) at Dec. 31, 2012			20,747
Net income	34,759	0	$ 0	0	34,759	0
Stock issued under compensation plans, net	2,304	0	$ 4	2,300	0	0
Stock issued under compensation plans, net (in shares)			494
Tax benefit from stock-based awards	1,305	0	$ 0	1,305	0	0
Stock-based compensation expense	3,519	0	0	3,519	0	0
Shares repurchased	(542)	0	$ 0	(542)	0	0
Shares repurchased (in shares)			(21)
Stock issued - other	56	0	$ 0	56	0	0
Stock issued - other (in shares)			3
Other comprehensive income	0
Balance at Dec. 31, 2013	296,091	0	$ 210	161,202	134,679	0
Balance (in shares) at Dec. 31, 2013			21,223
Net income	36,544	0	$ 0	0	36,544	0
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)
Stock issued - other	38	0	$ 0	38	0	0
Stock issued - other (in shares)			2
Other comprehensive income	13	0	$ 0	(13)	0	13
Balance at Dec. 31, 2014	322,553	0	$ 206	151,111	171,223	13
Balance (in shares) at Dec. 31, 2014			20,792
Net income	27,302	0	$ 0	0	27,302	0
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)	(16,336)	0
Shares repurchased (in shares)			(1,236)
Stock issued - other	28	0	$ 0	28	0	0
Stock issued - other (in shares)			0
Other comprehensive income	103	0	$ 0	0	0	103
Reclassification of shares repurchased	0	0	0	13,965	(13,965)	0
Balance at Dec. 31, 2015	$ 329,880	$ 0	$ 198	$ 161,342	$ 168,224	$ 116
Balance (in shares) at Dec. 31, 2015			19,969