Defined Benefit Pension Plans Schedule of Amounts Recognized in the Consolidated Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Amounts Recognized in the Consolidated Balance Sheets [Line Items]
Plan assets in other long-term assets	$ (223)	$ (227)
Current portion of pension plan liability in wages and benefits payable	2,979	2,899
Long-term portion of pension plan liability	87,805	90,533
Net pension plan benefit liability	$ (90,561)	$ (93,205)