Goodwill and Intangible Assets - Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Intangible Assets [Line Items]
Gross carrying amount	$ 223,935	$ 224,393
Accumulated amortization	(102,487)	(98,485)
Foreign currency exchange rate fluctuations	(1,385)	(1,041)
Net carrying amount	120,063	124,867
Customer relationships
Intangible Assets [Line Items]
Gross carrying amount	134,889	135,234
Accumulated amortization	(56,727)	(54,860)
Foreign currency exchange rate fluctuations	(1,398)	(1,058)
Net carrying amount	$ 76,764	$ 79,316
Customer relationships | Minimum
Intangible Assets [Line Items]
Useful life (in years)	10 years	10 years
Customer relationships | Maximum
Intangible Assets [Line Items]
Useful life (in years)	30 years	30 years
Acquired technology
Intangible Assets [Line Items]
Gross carrying amount	$ 77,029	$ 77,142
Accumulated amortization	(38,058)	(36,194)
Foreign currency exchange rate fluctuations	4	5
Net carrying amount	$ 38,975	$ 40,953
Acquired technology | Minimum
Intangible Assets [Line Items]
Useful life (in years)	5 years	3 years
Acquired technology | Maximum
Intangible Assets [Line Items]
Useful life (in years)	20 years	20 years
Backlog
Intangible Assets [Line Items]
Gross carrying amount	$ 1,150	$ 1,150
Accumulated amortization	(863)	(791)
Foreign currency exchange rate fluctuations	0	0
Net carrying amount	$ 287	$ 359
Useful life (in years)	4 years	4 years
Trade names
Intangible Assets [Line Items]
Gross carrying amount	$ 7,650	$ 7,650
Accumulated amortization	(5,206)	(5,037)
Foreign currency exchange rate fluctuations	9	11
Net carrying amount	$ 2,453	$ 2,624
Trade names | Minimum
Intangible Assets [Line Items]
Useful life (in years)	6 years	6 years
Trade names | Maximum
Intangible Assets [Line Items]
Useful life (in years)	12 years	12 years
Patents
Intangible Assets [Line Items]
Gross carrying amount	$ 3,217	$ 3,217
Accumulated amortization	(1,633)	(1,603)
Foreign currency exchange rate fluctuations	0	1
Net carrying amount	$ 1,584	$ 1,615
Patents | Minimum
Intangible Assets [Line Items]
Useful life (in years)	2 years	2 years
Patents | Maximum
Intangible Assets [Line Items]
Useful life (in years)	20 years	20 years