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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