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Fair Value Measurements (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Impaired long-lived assets      
Fair value measurements      
Weighted average disposal period used in estimation of the fair value of the impaired long-lived assets 4 years 4 years  
Impaired long-lived assets | Weighted average      
Fair value measurements      
Discount rate used in estimation of the fair value of the impaired long-lived assets (as a percent) 10.00% 9.00%  
Recurring basis | Level 2      
Fair value measurements      
Interest rate swaps asset $ 710   $ 712
Interest rate swaps liability (7,427)   $ (5,108)
Nonrecurring basis | Level 3      
Fair value measurements      
Impaired long-lived assets $ 559 $ 619