Net revenues Other revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2018	Apr. 02, 2017
Revenue, Major Customer [Line Items]
Revenue	$ 587,230	$ 487,881
Vascular access
Revenue, Major Customer [Line Items]
Revenue	144,241	130,022
Anesthesia
Revenue, Major Customer [Line Items]
Revenue	85,418	81,205
Interventional
Revenue, Major Customer [Line Items]
Revenue	71,680	43,966
Surgical
Revenue, Major Customer [Line Items]
Revenue	85,632	87,304
Interventional urology
Revenue, Major Customer [Line Items]
Revenue	42,300	0
OEM
Revenue, Major Customer [Line Items]
Revenue	45,872	43,346
Other (3)
Revenue, Major Customer [Line Items]
Revenue	$ 112,087	$ 102,038