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Organization and Summary of Significant Accounting Policies - Major Customer Revenue (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
customer
Dec. 31, 2017
USD ($)
customer
Dec. 31, 2016
customer
Concentration Risk [Line Items]      
Non-controlling interest in subsidiary $ 76 $ 90  
Cumulative Effect of New Accounting Principle in Period of Adoption   (3,365)  
Document Period End Date Dec. 31, 2018    
Deferred Costs $ 0 11,232  
Deferred tax asset $ 13,937 $ 6,317  
Fee Building Segment [Member] | Customer Concentration Risk [Member] | Sales Revenue [Member]      
Concentration Risk [Line Items]      
Concentration risk, number of customers | customer 1 1 1
Concentration Risk, Percentage 95.00% 97.00% 96.00%
Fee Building Segment [Member] | Customer Concentration Risk [Member] | Contracts and Accounts Receivable [Member]      
Concentration Risk [Line Items]      
Concentration risk, number of customers | customer 1 1  
Concentration Risk, Percentage 48.00% 49.00%