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 - Unamortised Acturial Gain/(Loss) [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				78,896				78,896
Other comprehensive income (loss), net of tax					(126)	43	(37,742)	(37,825)
Total Comprehensive Income								41,071
Stock options activity			2					2
Restricted stock activity, shares	69	23
Restricted stock activity		1,949						1,949
Dividends				(7,486)				(7,486)
Balance, value at Sep. 30, 2011	$ 1	$ 12,957	$ 67,422	$ 443,036	$ 293	$ (359)	$ (36,344)	$ 487,006
Balance, shares at Sep. 30, 2011	41,567	267