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Loans Receivable and Other Lending Investments, net (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable net of deferred income   $ 1,618,874,000   $ 1,618,874,000   $ 1,647,861,000
Provision for loan losses   700,000 $ 19,151,000 2,206,000 $ 23,444,000  
Loans receivable, net   $ 1,508,503,000   $ 1,508,503,000   $ 1,539,696,000
Loans sold, carrying value         5,500,000  
Realized investment gains (losses)         0  
Loan 1            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable net of deferred income $ 196,600,000   196,600,000   196,600,000  
Provision for loan losses 25,900,000          
Loans receivable, net 24,000,000   24,000,000   24,000,000  
Loans Receivable One            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable net of deferred income $ 146,700,000   $ 146,700,000   $ 146,700,000