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Notes Receivable, Net - Narrative (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) property note_receivable | Dec. 31, 2015 USD ($) property note_receivable | Dec. 31, 2014 USD ($) | Apr. 30, 2016 USD ($)
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Notes receivable, net | $ 276,163 | $ 147,188 |  |
Proceeds from notes receivable | 42,819 | 15,984 | $ 18,095 |
Nonperforming Financial Instruments [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Notes receivable, net | 12,000 | $ 12,000 |  |
Notes Receivable [Member] | Collateralized Note, 9.8% Interest Rate [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Notes receivable, net | $ 47,500 |  |  |
Effective interest rate | 9.80% |  |  |
Number of properties collateralized | property | 4 |  |  |
Notes Receivable [Member] | Five Notes Issued in Periods Prior to 2016 [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Notes receivable, net | $ 29,600 |  |  |
Proceeds from notes receivable | $ 42,800 |  |  |
Number of notes repaid | note_receivable | 5 |  |  |
Notes Receivable [Member] | First Mortgage Loan, 8.1% Loan, Due 2019 [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Notes receivable, net | $ 153,400 |  |  |
Effective interest rate | 8.10% |  |  |
Notes Receivable [Member] | Collateralized Note, 6.2% Interest Rate [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of receivables issued | note_receivable |  | 6 |  |
Notes receivable, net |  | $ 78,000 |  |
Effective interest rate |  | 6.20% |  |
Number of properties collateralized | property |  | 6 |  |
Notes Receivable [Member] | Four Notes in Periods Prior to 2015 [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Notes receivable, net |  | $ 22,900 |  |
Proceeds from notes receivable |  | $ 29,400 |  |
Number of notes repaid | note_receivable |  | 4 |  |
Mezzanine Loan [Member] | Mezzanine Loan, 15% Loan [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Notes receivable, net |  |  |  | $ 30,900
Effective interest rate |  |  |  | 15.00%
Core Portfolio [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Notes receivable, net | $ 216,400 | $ 113,048 |  |
Core Portfolio [Member] | Notes Receivable [Member] | Collateralized Note, 9.8% Interest Rate [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of receivables issued | note_receivable | 1 |  |  |
Fund IV [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Notes receivable, net | $ 24,250 | $ 0 |  |
Fund IV [Member] | Notes Receivable [Member] | Collateralized Note, 9.8% Interest Rate [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of receivables issued | note_receivable | 3 |  |  |

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