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JOTEC Acquisition (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended
	Nov. 30, 2017	Oct. 10, 2017	Sep. 30, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Term loan balance			$ 69,678	$ 73,594
Scenario, Forecast [Member] | JOTEC AG [Member]
Subsequent Event [Line Items]
Acquisition price	$ 225,000
Percent of payments to acquire business that is cash	75.00%
Percent of payments to acquire business that is in common stock issued	25.00%
Scenario, Forecast [Member] | JOTEC AG [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Common stock value issued in business combination	$ 56,250
Term Loan [Member] | Subsequent Event [Member] | JOTEC AG [Member]
Subsequent Event [Line Items]
Term loan balance		$ 69,000
Senior Secured Credit Facility [Member] | Scenario, Forecast [Member] | JOTEC AG [Member]
Subsequent Event [Line Items]
Financing for business acquisition	255,000
Term Loan B [Member] | Scenario, Forecast [Member] | JOTEC AG [Member]
Subsequent Event [Line Items]
Financing for business acquisition	225,000
Revolving Credit Facility [Member] | Scenario, Forecast [Member] | JOTEC AG [Member]
Subsequent Event [Line Items]
Financing for business acquisition	$ 30,000

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