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Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jul. 13, 2013
Jul. 13, 2011
Derivative Instrument Detail [Abstract]      
Derivative, Notional Amount     $ 150,000
Derivative, Maturity Date   Jul. 13, 2014  
Derivative, Inception Date     Jul. 13, 2011
DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNetIncomeTaxNet 776    
Derivative Liability, Fair Value, Gross Liability $ 1,377    
Derivative, Basis Spread on Variable Rate     5.50%
Derivative, Fixed Interest Rate     1.983%
DerivativeFixedInterestRateTotal     7.483%