Defined Benefit Pension Plans Schedule of Amounts Recognized in the Consolidated Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Amounts Recognized in the Consolidated Balance Sheets [Line Items]
Plan assets in other long-term assets	$ 231	$ 227
Current portion of pension plan liability in wages and benefits payable	3,789	2,899
Long-term portion of pension plan liability	92,607	90,533
Net pension plan benefit liability	$ 96,165	$ 93,205