Acquisitions And Strategic Investments (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Acquisitions And Strategic Investments [Line Items]
Acquisition of a business, net of cash acquired	$ 10,923,000	$ 2,658,000	$ 46,757,000
Cash payments to acquire businesses	10,800,000	3,600,000	47,800,000
Business Combinations	6,741,000		24,689,000
Useful life assigned to intangible asset, years	9 years 10 months 28 days		12 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	700,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	1,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	500,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets	2,100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent	1,700,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability	3,100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	4,800,000
RADIL [Member]
Acquisitions And Strategic Investments [Line Items]
Acquisition of a business, net of cash acquired			43,000,000
Intangibles acquired as result of business combination			18,700,000
Business Combinations			23,600,000
LPD [Member]
Acquisitions And Strategic Investments [Line Items]
Business Combinations	6,491,000
Customer Relationships [Member]
Acquisitions And Strategic Investments [Line Items]
Intangibles acquired as result of business combination			14,300,000
Useful life assigned to intangible asset, years			11 years
Intellectual Property [Member]
Acquisitions And Strategic Investments [Line Items]
Intangibles acquired as result of business combination			3,500,000
Useful life assigned to intangible asset, years			15 years
Customer Lists [Member]
Acquisitions And Strategic Investments [Line Items]
Intangibles acquired as result of business combination		1,700,000
Useful life assigned to intangible asset, years	10 years	10 years
Other Intangible Assets [Member]
Acquisitions And Strategic Investments [Line Items]
Intangibles acquired as result of business combination		$ 700,000
Useful life assigned to intangible asset, years		8 years
Noncompete Agreements [Member]
Acquisitions And Strategic Investments [Line Items]
Useful life assigned to intangible asset, years	5 years
Trademarks [Member]
Acquisitions And Strategic Investments [Line Items]
Useful life assigned to intangible asset, years	15 years