Business Combinations Total assets and liabilities (Details ) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Total current assets	$ 575,443	$ 702,827
Goodwill	485,685	154,281
Deferred tax liabilities, net	11,524
Non-controlling interests	5,588	7,309
Variable Interest Entity [Member]
Business Acquisition [Line Items]
Non-controlling interests	5,588	7,309	$ 8,310
Variable Interest Entity [Member] | Progentix Orthobiology [Member]
Business Acquisition [Line Items]
Total current assets	334	353
Identifiable intangible assets, net	10,900	13,048
Goodwill	12,654	12,654
Accounts payable & accrued expenses	551	574
Deferred tax liabilities, net	880	1,496
Non-controlling interests	$ 5,588	$ 7,309