Defined Benefit Pension Plans Schedule of Amounts Recognized in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Amounts Recognized in the Consolidated Balance Sheets [Line Items]
Plan assets in other long-term assets	$ 400	$ 567
Current portion of pension plan liability in wages and benefits payable	3,498	4,552
Long-term portion of pension plan liability	94,100	101,432
Net pension plan benefit liability	$ 97,198	$ 105,417