Acquisitions - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended
	Feb. 28, 2018	Sep. 29, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 61,058	$ 51,036
Twine Health, Inc. [Member]
Business Acquisition [Line Items]
Cash paid for acquisition	$ 16,700
Goodwill	10,000
Deferred tax liabilities	1,800
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue	200
Assumed liabilities	600
Consideration held as security for indemnifications obligations	2,600
Twine Health, Inc. [Member] | In Process Research and Development [Member]
Business Acquisition [Line Items]
Intangibles acquired	$ 5,400
Amortization period	4 years
Twine Health, Inc. [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangibles acquired	$ 3,800
Amortization period	7 years