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Loans Receivable and Other Lending Investments, net (Credit Characteristics by Payment Status) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Recorded investment in loans, aged by payment status and presented by class    
Current $ 1,152,178 $ 1,229,180
Less Than and Equal to 90 Days 0 0
Greater Than 90 Days 233,757 233,823
Total Past Due 233,757 233,823
Loans $ 1,385,935 $ 1,463,003
Financing receivable, number of loans greater than 90 days past due | loan 4 4
Financing receivables, past due time period 90 days 90 days
Minimum    
Recorded investment in loans, aged by payment status and presented by class    
Financing receivables, past due time period 1 year 1 year
Maximum    
Recorded investment in loans, aged by payment status and presented by class    
Financing receivables, past due time period 8 years 8 years
Senior mortgages    
Recorded investment in loans, aged by payment status and presented by class    
Current $ 762,720 $ 868,505
Less Than and Equal to 90 Days 0 0
Greater Than 90 Days 76,454 76,677
Total Past Due 76,454 76,677
Loans 839,174 945,182
Corporate/Partnership loans    
Recorded investment in loans, aged by payment status and presented by class    
Current 364,159 335,677
Less Than and Equal to 90 Days 0 0
Greater Than 90 Days 157,303 157,146
Total Past Due 157,303 157,146
Loans 521,462 492,823
Subordinate mortgages    
Recorded investment in loans, aged by payment status and presented by class    
Current 25,299 24,998
Less Than and Equal to 90 Days 0 0
Greater Than 90 Days 0 0
Total Past Due 0 0
Loans $ 25,299 $ 24,998