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Minority Business Investment (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule of Cost-method Investments [Line Items]
Revenue	$ 51,004,000	$ 47,716,000	$ 103,570,000	$ 91,543,000
Curepet, Inc. [Member]
Schedule of Cost-method Investments [Line Items]
Cost method investment, ownership percentage		19.80%		19.80%
Payments to acquire cost method investment		2,000,000
Revenue	553,000		1,200,000
Due from related parties, current	$ 1,400,000		$ 1,400,000

The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

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