Other Long Term Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Other Long Term Liabilities [Abstract]
Deferred Gains, net of Amortization	$ 32,654	$ 34,009
Pension and Post Retirement	10,303	10,339
Alabama Lease Incentive	6,600	6,887
Insurance Reserves	4,288	5,521
Derivatives	3,984	4,412
Other	2,528	4,138
Other Long Term Liabilities	$ 60,357	$ 65,306