Consolidated Statements of Stockholders' Equity - 6 months ended Jun. 30, 2016 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2015	$ 178,918	$ 212	$ 0	$ 178,706
Balance (in shares) at Dec. 31, 2015		53,012
Net income	25,147
Stock options exercised and restricted stock awards vested, including tax benefits	2,384	$ 1	2,383
Stock options exercised and restricted stock awards vested, including tax benefits (in shares)		297
Share-based compensation	2,043		2,043
Stock repurchased and retired	(7,674)	$ (1)	(4,426)	(3,247)
Stock repurchased and retired (in shares)		(301)
Dividends	(5,834)			(5,834)
Balance at Jun. 30, 2016	$ 194,984	$ 212	$ 0	$ 194,772
Balance (in shares) at Jun. 30, 2016		53,008