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Fair Value Measurements (Fair Value for Level 3 Liabilities) (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | $ 69,484 | $ 54,615
Contingent consideration recorded at acquisition date | 3,677 | 1,003
Payment of contingent consideration recorded at acquisition date | (2,812) | (1,621)
Adjustments to contingent consideration | 16,852 | 1,466
Interest accretion expense | 1,422 | 1,383
Ending balance | 88,522 | 56,954
Foreign Currency Translation Adjustment [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Foreign currency translation adjustment | $ (101) | $ 108

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