Acquisition - Consideration (Details) - Triage Business [Member] - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Oct. 06, 2017	Mar. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Cash consideration—Triage Business	$ 399,798
Deferred consideration—BNP Business		$ 220,600	$ 220,550
Contingent consideration—BNP Business	19,700
Net consideration	640,253
Consideration C [Member]
Business Acquisition [Line Items]
Inventory related adjustment	$ 205