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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Interest expense $ 1,958 $ 2,108
Swap    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Derivative, notional amount 50,000  
Interest expense $ 35 $ 90