Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Balance	$ (27,739)
Other comprehensive income	14,463	(9,073)	10,647
Balance	(13,276)	(27,739)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Balance	(19,806)	(13,015)	(2,028)
Cumulative effect of change in accounting for other-than-temporary impairment			(11,271)
Adjusted balance at January 1, 2009			(13,299)
Other comprehensive income	19,452	(6,791)	284
Balance	(354)	(19,806)	(13,015)
Unrecognized Net Pension Costs [Member]
Balance	(7,933)	(5,651)	(16,014)
Adjusted balance at January 1, 2009			(16,014)
Other comprehensive income	(4,989)	(2,282)	10,363
Balance	(12,922)	(7,933)	(5,651)
Accumulated Other Comprehensive Income (Loss) [Member]
Balance	(27,739)	(18,666)	(18,042)
Cumulative effect of change in accounting for other-than-temporary impairment			(11,271)
Adjusted balance at January 1, 2009			(29,313)
Other comprehensive income	14,463	(9,073)	10,647
Balance	$ (13,276)	$ (27,739)	$ (18,666)