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Commitments and Contingencies (Unfunded Commitments) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
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 $ 728,000
Strategic Investments 45,940
Discretionary Fundings 5,000
Total 778,940
Loans and Other Lending Investments  
Unfunded Financial Commitments [Line Items]  
Performance-Based Commitments 689,014
Strategic Investments 0
Discretionary Fundings 5,000
Total 694,014
Real Estate  
Unfunded Financial Commitments [Line Items]  
Performance-Based Commitments 15,626
Strategic Investments 0
Discretionary Fundings 0
Total 15,626
Other Investments  
Unfunded Financial Commitments [Line Items]  
Performance-Based Commitments 23,360
Strategic Investments 45,940
Discretionary Fundings 0
Total $ 69,300