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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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