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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration paid			$ 5,179	$ 0
Gain on fair value adjustment			2,100
Foreign exchange gain			2,800
Acquisition-related contingent consideration, current	$ 6,818		6,818		$ 4,963
Additional obligations	2,800	$ 1,100	2,825
Interest Rate Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	58,700		58,700
Convertible Senior Notes 1.00 percent due December 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long term notes	115,400		115,400
Senior Notes 5.50 Percent Due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long term notes	$ 301,800		$ 301,800