Goodwill and Intangible Assets - Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Intangible Assets [Line Items]
Gross carrying amount	$ 223,935	$ 224,393
Accumulated amortization	(111,282)	(98,485)
Foreign currency exchange rate fluctuations	(1,066)	(1,041)
Net carrying amount	111,587	124,867
Customer relationships
Intangible Assets [Line Items]
Gross carrying amount	134,889	135,234
Accumulated amortization	(60,964)	(54,860)
Foreign currency exchange rate fluctuations	(1,088)	(1,058)
Net carrying amount	$ 72,837	$ 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	(42,008)	(36,194)
Foreign currency exchange rate fluctuations	6	5
Net carrying amount	$ 35,027	$ 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	(1,006)	(791)
Foreign currency exchange rate fluctuations	0	0
Net carrying amount	$ 144	$ 359
Useful life (in years)	4 years	4 years
Trade names
Intangible Assets [Line Items]
Gross carrying amount	$ 7,650	$ 7,650
Accumulated amortization	(5,603)	(5,037)
Foreign currency exchange rate fluctuations	15	11
Net carrying amount	$ 2,062	$ 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	(1,701)	(1,603)
Foreign currency exchange rate fluctuations	1	1
Net carrying amount	$ 1,517	$ 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