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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