Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Business Acqusition (Details) (USD $)	3 Months Ended								12 Months Ended			0 Months Ended
Business Acqusition (Details) (USD $)	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 30, 2014	Sep. 24, 2012
Business Acquisition [Line Items]
Contractual obligations for acquisition of a business	$ 10,137,000				$ 0				$ 10,137,000	$ 0	$ 0
Assets Acquired and Liabilities Assumed
Goodwill	256,232,000us-gaap_Goodwill				248,428,000us-gaap_Goodwill				256,232,000us-gaap_Goodwill	248,428,000us-gaap_Goodwill	248,502,000us-gaap_Goodwill
Weighted average amortization period (in years)									27 years
Net sales	195,003,000us-gaap_SalesRevenueNet	174,961,000us-gaap_SalesRevenueNet	188,150,000us-gaap_SalesRevenueNet	181,941,000us-gaap_SalesRevenueNet	203,442,000us-gaap_SalesRevenueNet	179,255,000us-gaap_SalesRevenueNet	192,993,000us-gaap_SalesRevenueNet	187,014,000us-gaap_SalesRevenueNet	740,055,000us-gaap_SalesRevenueNet	762,704,000us-gaap_SalesRevenueNet	767,140,000us-gaap_SalesRevenueNet
Income (loss) before income taxes									46,675,000	50,632,000	59,480,000
Customer Relationships [Member]
Assets Acquired and Liabilities Assumed
Weighted average amortization period (in years)									33 years
EndoDynamix, Inc. [Member]
Business Acquisition [Line Items]
Cash paid for acqusition												1,300,000
Contractual obligations for acquisition of a business	10,100,000								10,100,000			13,900,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent												1,800,000
Assets Acquired and Liabilities Assumed
Goodwill												7,800,000
Weighted average amortization period (in years)												10 years
EndoDynamix, Inc. [Member] \| In Process Research and Development [Member]
Assets Acquired and Liabilities Assumed
Intangible assets												9,500,000
Viking Systems, Inc. [Member]
Business Acquisition [Line Items]
Cash paid for acqusition													22,500,000
Assets Acquired and Liabilities Assumed
Net sales										3,400,000
Income (loss) before income taxes										(1,500,000)
Pro Forma Information
Net sales										774,239,000
Net income										$ 38,018,000
Basic										$ 1.34
Diluted										$ 1.33