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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Significant Other Observable Inputs (Level 2) | Recurring basis      
Fair value measurement of assets and liabilities      
Interest rate swaps asset $ 710 $ 712  
Interest rate swaps liability (7,427) $ (5,108)  
Significant Unobservable Inputs (Level 3) | Nonrecurring basis      
Fair value measurement of assets and liabilities      
Impaired long-lived assets 3,072   $ 1,671
Long-term receivable from the sale of Canadian Operations $ 5,100