Other Long Term Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Other Long Term Liabilities [Abstract]
Derivatives	$ 4,412	$ 6,680
Alabama Lease Incentive	6,887	8,035
Deferred Gains, net of Amortization	34,009	39,227
Insurance Reserves	5,521	5,073
Pension & Post Retirement	10,339	19,781
Other	4,138	2,245
Other Long Term Liabilities	$ 65,306	$ 81,041