Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Balance	$ (13,276)
Other comprehensive income (loss)	(2,384)	14,463	(9,073)
Balance	(15,660)	(13,276)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Balance	(354)	(19,806)	(13,015)
Other comprehensive income (loss)	1,469	19,452	(6,791)
Balance	1,115	(354)	(19,806)
Unrecognized Net Pension Costs [Member]
Balance	(12,922)	(7,933)	(5,651)
Other comprehensive income (loss)	(3,853)	(4,989)	(2,282)
Balance	(16,775)	(12,922)	(7,933)
Accumulated Other Comprehensive Income (Loss) [Member]
Balance	(13,276)	(27,739)	(18,666)
Other comprehensive income (loss)	(2,384)	14,463	(9,073)
Balance	$ (15,660)	$ (13,276)	$ (27,739)