Operations and Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill and Intangible Asset Impairment [Abstract]
Goodwill	$ 256,232,000	$ 248,428,000	$ 248,502,000
Other intangible assets, net	316,440,000	319,440,000
Acquired Intangible Assets [Abstract]
Weighted average amortization period (in years)	27 years
Revenue Recognition [Abstract]
Net Commission Service Fee Revenue	50.00%
Shipping and handling costs	13,600,000	12,600,000	12,800,000
Allowance for doubtful accounts	$ 1,239,000	$ 1,384,000
Linvatec Corporation [Member]
Acquired Intangible Assets [Abstract]
Number of years of historical revenue attrition used to evaluate acquired finite-lived intangible assets useful life	5 years
Annual attrition rate used to evaluate acquired finite-lived intangible assets useful life	2.60%
Customer Relationships [Member]
Acquired Intangible Assets [Abstract]
Weighted average amortization period (in years)	33 years
Customer Relationships [Member] | Linvatec Corporation [Member]
Acquired Intangible Assets [Abstract]
Weighted average amortization period (in years)	38 years
Customer Relationships [Member] | Other Acquisitions Excluding Linvatec Corporation[Member]
Acquired Intangible Assets [Abstract]
Weighted average amortization period (in years)	16 years
Promotional, Marketing and Distribution Rights [Member]
Acquired Intangible Assets [Abstract]
Weighted average amortization period (in years)	25 years