Fair Value Measurements - Financial Assets and (Liabilities) Carried at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration liabilities	$ (48,088)	$ (58,486)
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate contracts, Assets	1,192	5,772
Interest rate contract, Liability	(290)
Foreign currency contract assets, current and long-term	2,447	1,578
Foreign currency contract liabilities, current and long-term	(4,255)	(1,608)
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent receivable asset		607
Contingent consideration liabilities	(76,709)	(82,236)
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 contracts, Assets	1,192	5,772
Interest rate contract, Liability	(290)
Foreign currency contract assets, current and long-term	2,447	1,578
Foreign currency contract liabilities, current and long-term	(4,255)	(1,608)
Contingent receivable asset		607
Contingent consideration liabilities	$ (76,709)	$ (82,236)