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Aquisitions In Text Linking (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011 Maine Water Company [Member] Customers	Feb. 03, 2012 Hebron Country Manor [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 35.6	$ 0.1
Number of customers	16,000
Number of Systems	11

This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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