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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration paid	$ 5,200		$ 5,179	$ 0
Gain (loss) on fair value adjustment	(2,100)		2,100
Foreign exchange gain (loss)	(300)		2,900
Acquisition-related contingent consideration, current	6,690		6,690		$ 4,963
Additional obligations	800	$ 1,100	772
Interest Rate Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	63,000		63,000
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	115,000		115,000
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	$ 292,600		$ 292,600