Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Fair Value Measurement- Fair Value of Liabilities Measured on a Recurring Basis (Details) - Recurring - Level 2 - Interest rate swap instruments - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Assets:    
Interest rate swap instruments $ 30 $ 0
Liabilities:    
Interest rate swap instruments $ 3,501 $ 3,843