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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