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Supplemental Information (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other liabilities	$ 157,130us-gaap_OtherLiabilitiesNoncurrent	$ 174,859us-gaap_OtherLiabilitiesNoncurrent
Non-current pension obligation, a component of other liabilities	$ 123,207	$ 136,296

This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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