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Goodwill and Other Intangibles Additional Information (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 61,452,000	$ 63,423,000
Credo [Member]
Business Acquisition [Line Items]
Goodwill	57,578,000	59,549,000
Credo [Member] | Patents [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Net	307,000
Water Resource Company [Member]
Business Acquisition [Line Items]
Goodwill	3,874,000	$ 3,784,000,000
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 1,681,000

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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