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Goodwill and Other Intangibles Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Business Acquisition [Line Items]    
Goodwill $ 64,493 $ 64,493
Austin, Texas [Member] | Multi Family Property [Member]
   
Business Acquisition [Line Items]    
Finite-Lived Intangible Assets, Net 865  
Credo [Member]
   
Business Acquisition [Line Items]    
Goodwill 60,619  
Credo [Member] | Patents [Member]
   
Business Acquisition [Line Items]    
Finite-Lived Intangible Assets, Net 401  
Water Resource Company [Member]
   
Business Acquisition [Line Items]    
Goodwill 3,874  
Finite-Lived Intangible Assets, Net $ 1,681