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Notes Receivable and Allowance for Losses - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
category
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of notes receivable categories for evaluating credit losses | category 2    
Number of days outstanding to consider loans outstanding past due in order to cease accruing interest (more than) 30 days    
Loan reserves $ 7,430 $ 6,765  
Proceeds from collection of notes receivable 11,070 4,849 $ 11,289
Notes receivable, related parties 125,911 94,444  
Allowance for losses on non-impaired loans 6,660 5,979  
Amortization expense 11,705 11,542 9,365
Mezzanine & Other Notes Receivable      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loan reserves 2,417 2,150 2,326
Notes receivable, related parties 74,436 50,111  
Allowance for losses on non-impaired loans 1,647 1,364  
Mezzanine & Other Notes Receivable | Variable Interest Entity, Not Primary Beneficiary      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable 33,500    
Mezzanine & Other Notes Receivable | Variable Interest Entity, Not Primary Beneficiary | Interest Rate Below Market Rate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Notes receivable 2,000    
Notes receivable, discount 200    
Forgivable Notes Receivable      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loan reserves 5,013 4,615 3,661
Notes receivable, related parties 51,475 44,333  
Allowance for losses on non-impaired loans 5,013 4,615  
Forgivable, unsecured notes, past due 1,000 1,200  
Amortization expense 9,000 8,200 $ 5,000
Impaired Loans | Mezzanine & Other Notes Receivable      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impaired loans, carrying value 1,900 800  
Loan reserves on impaired loans 1,600 800  
Average notes on nonaccrual status 1,400 800  
Interest income on impaired loans, cash basis method 43 33  
Non-impaired Loans | Mezzanine & Other Notes Receivable      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loan reserves $ 800 $ 1,400