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, 2010	$ 334,187	$ 907	$ 439	$ 335,922	$ 0	$ (3,081)
Net income	69,932	0	0	69,932	0	0
Other comprehensive income, net of tax	0	0	0	0	0	0
Dividends on common stock	(7,148)	0	0	(7,148)	0	0
Stock Issued During Period, Value, Treasury Stock Reissued	0
Repurchases of common stock	(56,350)	0	0	0	(56,350)	0
Stock-based Compensation	150	0	150	0	0	0
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
Stock Issued During Period, Value, Treasury Stock Reissued	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