Consolidated Statement of Shareholders' Equity and Comprehensive Income (Loss) (USD $) In Thousands, except Share data	Total	Common Stock Including Additional Paid in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2008	$ 471,593	$ 54,634	$ (67,244)	$ 484,203
Share balance at Dec. 31, 2008		26,668,440
Net Income	(94,142)			(94,142)
Other comprehensive income	10,668		10,668
Other Comprehensive Income, Net of Tax	(83,474)
Stock Based Compensation Expense	2,380	2,380
Tax Impact of Stock Options	(160)	(160)
Cash Dividends Declared	(17,067)			(17,067)
Balance at Dec. 31, 2009	373,272	56,854	(56,576)	372,994
Share balance at Dec. 31, 2009		26,668,440
Net Income	51,643			51,643
Other comprehensive income	854		854
Other Comprehensive Income, Net of Tax	52,497
Stock Options Exercised, Shares		145,350
Stock Options Exercised, Value	2,448	2,448
Issuance Of Restricted Stock		40,000
Stock Based Compensation Expense	2,373	2,373
Cash Dividends Declared	(17,108)			(17,108)
Balance at Dec. 31, 2010	413,482	61,675	(55,722)	407,529
Share balance at Dec. 31, 2010	26,853,790	26,853,790
Net Income	67,169			67,169
Other comprehensive income	(9,878)		(9,878)
Other Comprehensive Income, Net of Tax	57,291
Stock Options Exercised, Shares		286,973
Stock Options Exercised, Value	4,546	4,546
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures		23,250
Stock Based Compensation Expense	2,251	2,251
Tax Impact of Stock Options	303	303
Cash Dividends Declared	(17,358)			(17,358)
Balance at Dec. 31, 2011	$ 460,515	$ 68,775	$ (65,600)	$ 457,340
Share balance at Dec. 31, 2011	27,164,013	27,164,013