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Summary of Significant Accounting Policies - (Details)
$ in Thousands
3 Months Ended
Jan. 01, 2018
USD ($)
Mar. 31, 2018
USD ($)
issuer
shares
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
shares
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Investments - debt securities   $ 46,346   $ 76,245
Investments - equity securities   $ 44,928    
Common stock equivalents | shares   0   0
Real estate revenue   $ 7,702 $ 1,525  
Accounts receivable, net   11,224   $ 8,460
Investment in real estate, net   (332,628)   $ (332,624)
Adoption of ASU 2018-02 Income Statement - Reporting Comprehensive Income   300    
U.S. Treasury securities        
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Investments - debt securities   9,901    
Corporate debt securities        
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Investments - debt securities   $ 36,445    
Commercial paper        
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Number of issuers | issuer   12    
Commercial paper   $ 179,200    
Non-investment grade | Corporate debt securities        
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Investments - debt securities   $ 36,400    
Number of issuers | issuer   3    
Non-investment grade | Preferred stock        
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Number of issuers | issuer   5    
Investments - equity securities   $ 44,900    
Investment grade | Preferred stock        
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Number of issuers | issuer   2    
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09        
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Adjustment to retained earnings, before tax $ 1,500      
Adjustment to retained earnings, tax (400)      
Adjustment to retained earnings, net of tax 1,100      
Accounts receivable, net 2,100      
Investment in real estate, net 600      
Retained Earnings        
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Adoption of ASU 2018-02 Income Statement - Reporting Comprehensive Income   $ 313    
Retained Earnings | Accounting Standards Update 2016-01        
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Adjustment to retained earnings, before tax (900)      
Adjustment to retained earnings, tax 200      
Adjustment to retained earnings, net of tax $ 700      
Homebuilder Homesite Sales, Lot Residuals        
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Real estate revenue   400    
Homebuilder Homesite Sales, Marketing Fees And Tap And Impact Fee Credits        
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]        
Real estate revenue   $ 300