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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