Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Fair Value Measurement- Fair Value of Liabilities Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Recurring | Level 2 | Interest rate swap instruments    
Liabilities:    
Interest rate swap instruments $ 8,509 $ 4,681