Defined Benefit Pension Plans Schedule of Amounts Recognized in the Consolidated Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Amounts Recognized in the Consolidated Balance Sheets [Line Items]
Plan Assets in Other Long Term Assets	$ (567)	$ (1,426)
Current Portion of Pension Plan Liability in Wages and Benefits Payable	4,552	3,721
Long-term portion of pension plan liability	101,432	88,687
Net Penison Plan Benefit Liability	$ (105,417)	$ (90,982)