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Fair Value Measurements (Schedule of Carrying Value and Estimated Fair Value of Financial Instruments) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Document Period End Date     Sep. 30, 2019    
Contingent consideration $ 2,110   $ 2,110   $ 2,207
Payment for Contingent Consideration Liability, Financing Activities     (514) $ 0  
Payment for Contingent Consideration Liability, Operating Activities     (1,332) 0  
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 1,492 $ 0 1,749 $ 0  
Debt Instrument, Fair Value Disclosure $ 78,200   $ 78,200