Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement- Fair Value of Liabilities Measured on a Recurring Basis (Details)

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Fair Value Measurement- Fair Value of Liabilities Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Other liabilities | Derivatives Designated as Hedging Instruments | Recurring | Level 2 | Interest rate swap instruments    
Liabilities:    
Interest rate swap instruments $ 3,783 $ 4,430