Other Long Term Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Other Long Term Liabilities [Abstract]
Deferred Gains, net of Amortization	$ 15,997	$ 17,917
Pension and Post Retirement	12,084	12,497
Alabama Lease Incentive	5,165	5,739
Insurance Reserves	5,407	4,941
Derivatives		7,050
Deferred Tax Liability	200	408
Other	972	1,732
Other Long Term Liabilities	$ 39,825	$ 50,284