Defined Benefit Pension Plans Schedule of Amounts Recognized in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Amounts Recognized in the Consolidated Balance Sheets [Line Items]
Plan Assets in Other Long Term Assets	$ 654	$ 359
Current Portion of Pension Plan Liability in Wages and Benefits Payable	3,202	3,493
Long-term portion of pension plan liability	84,498	85,971
Net Pension Plan Benefit Liability	$ 87,046	$ 89,105