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Derivative Instruments - Derivative contract and instruments (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Derivative Instruments  
Liability Derivatives $ 2,829
Interest rate swap | Interest expense  
Derivative Instruments  
Amount of Loss Recognized on Derivatives 3,131
Interest rate swap | Other long-term liabilities  
Derivative Instruments  
Liability Derivatives $ 2,829