Goodwill and Other Intangible Assets - Amortization of the Acquired Intangible Assets Other than Goodwill (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortized intangible assets
Gross Carrying Amount	$ 156,791	$ 156,703
Accumulated Amortization	(25,466)	(20,099)
Customer Relationships
Amortized intangible assets
Gross Carrying Amount	141,631	141,455
Accumulated Amortization	(16,259)	(11,453)
Patents
Amortized intangible assets
Gross Carrying Amount	4,252	4,333
Accumulated Amortization	(3,771)	(3,816)
Technology
Amortized intangible assets
Gross Carrying Amount	2,500	2,500
Accumulated Amortization	(853)	(810)
Trade Names
Amortized intangible assets
Gross Carrying Amount	7,238	7,235
Accumulated Amortization	(3,413)	(2,840)
License Agreements
Amortized intangible assets
Gross Carrying Amount	610	619
Accumulated Amortization	(610)	(619)
Other
Amortized intangible assets
Gross Carrying Amount	560	561
Accumulated Amortization	$ (560)	$ (561)