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Notes Receivable and Allowance for Losses Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 12, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
category
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Notes Receivable and Allowance for Losses [Line Items]            
Number of categories, credit losses for notes receivable | category       2    
Notes receivable   $ 159,316   $ 159,316   $ 125,911
Allowance for losses on non-impaired loans   7,077   7,077   5,783
Amortization expense   3,095 $ 2,986 9,215 $ 8,707  
Loan reserves   8,724   8,724   7,430
Notes receivable outstanding   150,592   150,592   118,481
Transfer of notes receivable to third party $ 24,200          
Forgivable Notes Receivable            
Notes Receivable and Allowance for Losses [Line Items]            
Notes receivable   66,698   66,698   51,475
Allowance for losses on non-impaired loans   6,307   6,307   5,013
Amortization expense   2,600 $ 2,300 7,500 6,700  
Loan reserves   6,307   6,307   5,013
Notes receivable outstanding   60,391   60,391   46,462
Mezzanine & Other Notes Receivable            
Notes Receivable and Allowance for Losses [Line Items]            
Notes receivable   92,618   92,618   74,436
Allowance for losses on non-impaired loans   770   770   770
Loan reserves   2,417   2,417   2,417
Notes receivable outstanding   90,201   90,201   72,019
Mezzanine & Other Notes Receivable | Impaired Loans            
Notes Receivable and Allowance for Losses [Line Items]            
Impaired receivables, recorded investment   1,800   1,800   1,900
Impaired receivables, related allowance   1,600   1,600   1,600
Average notes receivable, nonaccrual status       1,800 1,400  
Interest income, impaired loans       44 $ 43  
Mezzanine & Other Notes Receivable | Non-impaired Loans            
Notes Receivable and Allowance for Losses [Line Items]            
Loan reserves   800   800   $ 800
Notes Receivable            
Notes Receivable and Allowance for Losses [Line Items]            
Notes receivable outstanding $ 49,100          
Variable Interest Entity, Not Primary Beneficiary | Mezzanine & Other Notes Receivable            
Notes Receivable and Allowance for Losses [Line Items]            
Loans and financing receivable   33,600   33,600    
Interest Rate Below Market Reduction | Variable Interest Entity, Not Primary Beneficiary | Mezzanine & Other Notes Receivable            
Notes Receivable and Allowance for Losses [Line Items]            
Loans and financing receivable   2,100   2,100    
Receivable with Imputed Interest, discount   $ 100   $ 100