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Goodwill and Other Intangibles Additional Information (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 63,423,000us-gaap_Goodwill	$ 63,423,000us-gaap_Goodwill
Austin, Texas [Member] \| Multi Family Property [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Net	433,000
Credo [Member]
Business Acquisition [Line Items]
Goodwill	59,549,000
Credo [Member] \| Patents [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Net	354,000
Water Resource Company [Member]
Business Acquisition [Line Items]
Goodwill	3,874,000
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 1,681,000