Fair Value Measurements - Financial Assets and (Liabilities) Carried at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liabilities	$ (36,917)	$ (48,088)
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate contract asset, long-term		1,192
Interest rate contract liabilities, current and long-term	(4,358)	(290)
Foreign currency contract assets, current and long-term	3,078	2,447
Foreign currency contract liabilities, current and long-term	(8,267)	(4,255)
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liabilities	(55,750)	(76,709)
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate contract asset, long-term		1,192
Interest rate contract liabilities, current and long-term	(4,358)	(290)
Foreign currency contract assets, current and long-term	3,078	2,447
Foreign currency contract liabilities, current and long-term	(8,267)	(4,255)
Contingent consideration liabilities	$ (55,750)	$ (76,709)