Goodwill and Other Intangible Assets - Amortization of the Acquired Intangible Assets Other than Goodwill (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Amortized intangible assets
Gross Carrying Amount	$ 159,084	$ 51,992
Accumulated Amortization	(16,414)	(11,449)
Customer Relationships
Amortized intangible assets
Gross Carrying Amount	143,651	39,474
Accumulated Amortization	(8,538)	(4,460)
Patents
Amortized intangible assets
Gross Carrying Amount	4,376	4,504
Accumulated Amortization	(3,796)	(3,821)
Technology
Amortized intangible assets
Gross Carrying Amount	2,500	2,500
Accumulated Amortization	(769)	(644)
Trade Names
Amortized intangible assets
Gross Carrying Amount	7,368	4,288
Accumulated Amortization	(2,263)	(1,461)
License Agreements
Amortized intangible assets
Gross Carrying Amount	625	640
Accumulated Amortization	(625)	(640)
Other
Amortized intangible assets
Gross Carrying Amount	564	586
Accumulated Amortization	$ (423)	$ (423)