Supplemental Financial Information (Summary of Accrued Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Contingent consideration	$ 42,302	$ 18,530
Legal and administrative costs	23,386	9,189
CRM purchase price adjustment payable to MicroPort Scientific Corporation	14,891	14,891
Operating lease liabilities	10,779	0
Product remediation	11,521	13,945
Other amounts payable to MicroPort Scientific Corporation	5,105	9,319
Restructuring related liabilities	4,396	9,393
Provisions for agents, returns and other	4,549	4,934
Derivative contract liabilities	1,759	5,063
Other accrued expenses	31,848	39,021
Accrued liabilities	150,536	124,285
Contract liability	$ 5,500	$ 4,800