Condensed Consolidated Statement of Shareholders' Equity (USD $) In Thousands	Common Stock [Member]	Restricted Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income - Unrealized Investment Gain [Member]	Accumulated Other Comprehensive Income - Unamortized actuarial gain [Member]	Accumulated Other Comprehensive Income - Foreign Currency Translation Adjustment [Member]	Total
Balance, value at Dec. 31, 2010	$ 1	$ 11,008	$ 67,420	$ 371,626	$ 419	$ (402)	$ 1,398	$ 451,470
Balance, shares at Dec. 31, 2010	41,498	244
Net income				52,689				52,689
Other comprehensive income, net of tax					(308)	7	2,468	2,167
Total Comprehensive Income								506,326
Stock options activity			2					2
Restricted stock activity, shares	52	(45)
Restricted stock activity		1,222						1,222
Dividends				(4,995)				(4,995)
Balance, value at Jun. 30, 2011	$ 1	$ 12,230	$ 67,422	$ 419,320	$ 111	$ (395)	$ 3,866	$ 502,555
Balance, shares at Jun. 30, 2011	41,550	199