Consolidated Statements of Stockholders' Equity (USD $) In Thousands		Total	Common Stock		Paid-in Capital	Retained Earnings
Balance at Dec. 31, 2012		$ 138,136	$ 147	[1]	$ 0	$ 137,989	[1]
Balance (in shares) at Dec. 31, 2012	[1]		36,777
Net income		19,259				19,259	[1]
Stock options exercised and restricted stock awards vested, including tax benefits		1,152	1		1,151
Stock options exercised and restricted stock awards vested, including tax benefits (in shares)			139
Share-based compensation		695			695
Stock repurchased and retired		(3,010)	(1)		(1,846)	(1,163)	[1]
Stock repurchased and retired (in shares)			(161)
Dividends	[2]	(3,712)				(3,712)	[1]
Balance at Jun. 30, 2013		$ 152,520	$ 147	[1]	$ 0	$ 152,373	[1]
Balance (in shares) at Jun. 30, 2013	[1]		36,755

[1] Reflects three-for-two stock split effective July 2, 2013

[2] Includes cash payment of fractional shares from three-for-two stock split effective July 2, 2013