Discontinued Operations - Depreciation and Amortization (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business			$ 166,383	$ 0
Infectious Disease Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amortization from discontinued operations			0	7,071
Changes in contingent purchase price			0	3,543
Gain on sale of business	$ 0	$ 0	(168,955)	0
Reserve for excess or obsolete inventory			0	(435)
Proceeds from sale of business			166,383	0
Payments on contingent purchase price			$ 0	$ (62,618)