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Summary of Significant Accounting Policies - Fair Value Measurements (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Amount after measurement period | $ 65,000 |  | $ 65,000 |
Liability, remaining | 10,800 |  | 10,800 |
Aggregate maximum payout amount | 48,600 |  | 48,600 |
Change in fair value of contingent consideration liabilities | $ 78 | $ 3,777 | 598 | $ 8,064
Cash payment for contingent consideration liabilities |  |  | $ 11,000 |
Shares transferred in settlement of contingent consideration liabilities (in shares) | shares |  |  | 4,277 |
2.900% Senior Notes due 2030 | Senior Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate | 2.90% |  | 2.90% |
Long-term debt, fair value | $ 1,020,000 |  | $ 1,020,000 |
Volatility | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration liability, measurement input | 0.300 |  | 0.300 |
Discount Rate | Level 3 | Minimum |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration liability, measurement input | 0.001 |  | 0.001 |
Discount Rate | Level 3 | Maximum |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration liability, measurement input | 0.039 |  | 0.039 |
Discount Rate | Level 3 | Weighted Average |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration liability, measurement input | 0.024 |  | 0.024 |

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e7008-128479 + Details
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