Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities- Fair Value of Derivative Instruments on the Balance Sheet (Details)

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Derivative Instruments and Hedging Activities- Fair Value of Derivative Instruments on the Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Recurring | Level 2 | Derivatives Designated as Hedging Instruments | Interest rate swap instruments | Other liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities $ 5,825 $ 4,430