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Commitments and Contingencies (Unfunded Commitments) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Percentage of capital committed to strategic investments that may be drawn down 100.00%
Unfunded Financial Commitments [Line Items]  
Performance-Based Commitments $ 406,477
Strategic Investments 45,540
Total 452,017
Loans and Other Lending Investments  
Unfunded Financial Commitments [Line Items]  
Performance-Based Commitments 366,287
Strategic Investments 0
Total 366,287
Real Estate  
Unfunded Financial Commitments [Line Items]  
Performance-Based Commitments 14,616
Strategic Investments 0
Total 14,616
Other Investments  
Unfunded Financial Commitments [Line Items]  
Performance-Based Commitments 25,574
Strategic Investments 45,540
Total 71,114
Loan Participations Payable  
Unfunded Financial Commitments [Line Items]  
Performance-Based Commitments $ 158,700