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Loans Receivable and Other Lending Investments, net (Troubled Debt Restructurings) (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) Loan | Dec. 31, 2013 USD ($) Loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Pre-modification outstanding recorded investment | $ 11,600,000 |  |
Unfunded commitments, troubled debt restructurings | 0 |  |
Non-performing mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loans | Loan |  | 1 |
Recorded investment of loans whose maturity was extended |  |  | $ 174,500,000
Non-performing mortgage | One Year Payment Extension |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loans | Loan |  |  | 2
Recorded investment of loans whose maturity was extended |  | $ 7,000,000 | $ 98,300,000
Initial paydowns loans whose maturity was extended |  |  | $ 15,400,000
Finance receivable, trouble debt restructuring time period |  | 1 year |
Senior mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loans | Loan |  |  | 6
Performing First Mortgage | One Year Payment Extension |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recorded investment of loans whose maturity was extended |  |  | $ 4,600,000
Individually Evaluated for Impairment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Pre-modification outstanding recorded investment | $ 5,800,000 |  |

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