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Goodwill and Other Intangibles Additional Information (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Business Acquisition [Line Items] |  |
Goodwill | $ 63,355 | $ 63,423
Austin, Texas [Member] | Multi Family Property [Member] |  |
Business Acquisition [Line Items] |  |
Finite-Lived Intangible Assets, Net | 217 |
Credo [Member] |  |
Business Acquisition [Line Items] |  |
Goodwill | 59,481 | 59,549
Credo [Member] | Patents [Member] |  |
Business Acquisition [Line Items] |  |
Finite-Lived Intangible Assets, Net | 330 |
Water Resource Company [Member] |  |
Business Acquisition [Line Items] |  |
Goodwill |  | $ 3,874
Indefinite-Lived Intangible Assets (Excluding Goodwill) | $ 1,681 |

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