Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized (Gain) Loss Arising During Period, Tax	$ 39	$ (38)	$ 814
Tax effect of Amortization of Net Loss Recognized in Net Periodic Benefit Cost	(26)	(41)	0
Tax effect of amortization of prior service cost recognized in net periodic benefit cost	(5)	(7)	(7)
Other Comprehensive Income (Loss), Finalization of Pension and Non-Pension Postretirement Plan Valuation, Tax	$ (30)	$ 0	$ 0