Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities- Effects of Derivative Instruments in Accumulated Other Comprehensive Income (Details)

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Derivative Instruments and Hedging Activities- Effects of Derivative Instruments in Accumulated Other Comprehensive Income (Details) (Derivatives Designated as Hedging Instruments:, Interest Rate Swap Contracts, USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Derivatives Designated as Hedging Instruments: | Interest Rate Swap Contracts
   
Derivative Instruments, Gain (Loss) [Line Items]    
Loss Recognized in Accumulated Other Comprehensive Income $ 2,349  
Interest Expense Reclassified from Accumulated Other Comprehensive Income into Other Expenses, Net   $ 364