Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments - Classification of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)

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Fair Value of Financial Instruments - Classification of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - Significant Unobservable Inputs (Level 3) [Member] - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Liabilities:    
Contingent consideration $ 65,671 $ 90,912
Liabilities $ 65,671 $ 90,912