Defined Benefit Pension Plans Schedule of Amounts Recognized in the Consolidated Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of Amounts Recognized in the Consolidated Balance Sheets [Line Items]
Plan Assets in Other Long Term Assets	$ (452)	$ (449)
Current Portion of Pension Plan Liability in Wages and Benefits Payable	2,608	2,621
Long-term portion of pension plan liability	60,822	62,449
Net Penison Plan Benefit Liability	$ 62,978	$ 64,621