Goodwill and other intangible assets, net - Components of intangible assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 3,025,666	$ 3,033,706
Accumulated Amortization	(783,399)	(708,654)
In-process research and development
Finite-Lived Intangible Assets [Line Items]
In-process research and development	28,404	28,457
Accumulated Amortization	0	0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	1,025,516	1,030,194
Accumulated Amortization	(345,715)	(322,972)
Intellectual property
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	1,359,876	1,363,516
Accumulated Amortization	(363,396)	(322,539)
Distribution rights
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	23,455	23,465
Accumulated Amortization	(18,397)	(17,860)
Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	565,434	565,070
Accumulated Amortization	(43,644)	(36,379)
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets	22,981	23,004
Accumulated Amortization	$ (12,247)	$ (8,904)