Consolidated Statements of Stockholders' Equity (USD $) In Thousands		Total	Common Stock		Paid-in Capital	Retained Earnings
Balance at Dec. 31, 2013		$ 164,106	$ 221	[1]	$ 0	$ 163,885	[1]
Balance (in shares) at Dec. 31, 2013	[1]		55,067
Net income		33,625				33,625	[1]
Stock options exercised and restricted stock awards vested, including tax benefits		1,816	1	[1]	1,815
Stock options exercised and restricted stock awards vested, including tax benefits (in shares)	[1]		303
Share-based compensation		1,578			1,578
Stock repurchased and retired		(17,309)	(4)	[1]	(3,393)	(13,912)	[1]
Stock repurchased and retired (in shares)	[1]		(910)
Dividends	[2]	(4,773)				(4,773)	[1]
Balance at Sep. 30, 2014		$ 179,043	$ 218	[1]	$ 0	$ 178,825	[1]
Balance (in shares) at Sep. 30, 2014	[1]		54,460

[1] Reflects three-for-two stock split effective July 16, 2014

[2] Includes cash payment of fractional shares from the three-for-two stock split effective July 16, 2014