Consolidated Statements of Stockholders' Equity (USD $) In Thousands	Total	Capital Stock, Common	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2011	$ 340,771	$ 907	$ 589	$ 398,706	$ (56,350)	$ (3,081)
Net income	61,541	0	0	61,541	0	0
Other comprehensive income, net of tax	1,797	0	0	0	0	1,797
Dividends on common stock	(91,934)	0	0	(91,934)	0	0
Repurchases of common stock	(24,190)	0	0	0	(24,190)	0
Stock-based Compensation	2,379	0	2,379	0	0	0
Balance at Dec. 31, 2012	290,364	907	2,968	368,313	(80,540)	(1,284)
Net income	70,582	0	0	70,582	0	0
Other comprehensive income, net of tax	1,284	0	0	0	0	1,284
Dividends on common stock	(6,861)	0	0	(6,861)	0	0
Stock Issued During Period, Value, Treasury Stock Reissued	41,100	0	1,745	0	39,355	0
Stock-based Compensation	1,184	0	1,184	0	0	0
Balance at Dec. 31, 2013	397,653	907	5,897	432,034	(41,185)	0
Net income	84,834	0	0	84,834	0	0
Other comprehensive income, net of tax	0					0
Dividends on common stock	(7,034)	0	0	(7,034)	0	0
Stock Issued During Period, Value, Treasury Stock Reissued	0
Stock-based Compensation	1,134	0	(1,839)	0	2,973	0
Balance at Dec. 31, 2014	$ 476,587	$ 907	$ 4,058	$ 509,834	$ (38,212)	$ 0