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Derivative Instruments Balance Sheet Location (Details) (Not Designated as Hedging Instrument [Member], Interest rate derivatives, Other Noncurrent Assets [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Not Designated as Hedging Instrument [Member] | Interest rate derivatives | Other Noncurrent Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Assets | $ 95 | $ 116
Liabilities | $ 0 | $ 0

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