Acquisitions - Purchase Price Allocation (Catheter Connections, Inc.) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill	$ 219,911	$ 211,927
Catheter Connections, Inc.
Business Acquisition [Line Items]
Trade receivables	952
Inventories	2,244
Prepaid expenses	181
Property and equipment	1,472
Goodwill	7,612
Total assets acquired	38,361
Trade payables	(338)
Accrued expenses	(23)
Total liabilities assumed	361
Net assets acquired, net of cash received of $1,327	38,000
Developed technology | Catheter Connections, Inc.
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	22,900
Customer Lists | Catheter Connections, Inc.
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	100
Trademarks | Catheter Connections, Inc.
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 2,900