Goodwill and Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 109,434	$ 97,680
Accumulated Amortization	(43,246)	(38,127)
Net Carrying Amount	66,188	59,553
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	18,196	16,528
Accumulated Amortization	(4,334)	(3,737)
Net Carrying Amount	13,862	12,791
Distribution agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,192	7,262
Accumulated Amortization	(5,278)	(4,686)
Net Carrying Amount	2,914	2,576
License agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	23,845	23,783
Accumulated Amortization	(6,419)	(5,568)
Net Carrying Amount	17,426	18,215
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	21,516	16,224
Accumulated Amortization	(5,550)	(4,686)
Net Carrying Amount	15,966	11,538
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,028	1,028
Accumulated Amortization	(985)	(968)
Net Carrying Amount	43	60
Customer lists
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	35,737	31,935
Accumulated Amortization	(20,680)	(18,482)
Net Carrying Amount	15,057	13,453
In-process technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	920	920
Accumulated Amortization	0	0
Net Carrying Amount	$ 920	$ 920