Goodwill and Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 110,653	$ 97,680
Accumulated Amortization	(46,088)	(38,127)
Net Carrying Amount	64,565	59,553
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	18,676	16,528
Accumulated Amortization	(4,665)	(3,737)
Net Carrying Amount	14,011	12,791
Distribution agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,012	7,262
Accumulated Amortization	(5,509)	(4,686)
Net Carrying Amount	2,503	2,576
License agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	24,913	23,783
Accumulated Amortization	(6,895)	(5,568)
Net Carrying Amount	18,018	18,215
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	21,514	16,224
Accumulated Amortization	(6,039)	(4,686)
Net Carrying Amount	15,475	11,538
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,028	1,028
Accumulated Amortization	(993)	(968)
Net Carrying Amount	35	60
Customer lists
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	35,590	31,935
Accumulated Amortization	(21,987)	(18,482)
Net Carrying Amount	13,603	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