Acquisitions And Disposition Of Strategic Investment (Narrative) (Details) (USD $)	9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Computer Software, Intangible Asset [Member]	Sep. 30, 2014 Computer Software, Intangible Asset [Member]	Sep. 30, 2014 Veterinary Reference Laboratory Customer List [Member]
Payments to Acquire Businesses, Net of Cash Acquired	$ 7,516,000	$ 10,101,000		$ 3,000,000	$ 3,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			3,100,000	3,100,000
Goodwill, Acquired During Period				700,000
Proceeds from sale of equity investment	5,400,000
Equity method investment, ownership percentage disposed	11.00%
Equity method investment, Realized gain on disposal	697,000
Finite-Lived Intangible Asset, Useful Life			7 years		14 years
Business Combination, Contingent Consideration, Asset			$ 800,000	$ 800,000	$ 1,100,000