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Commitments and Contingencies (Unfunded Commitments) (Details) $ in Thousands	Sep. 30, 2017 USD ($)
Other Commitments [Line Items]
Performance-Based Commitments	$ 374,160
Strategic Investments	45,642
Total	419,802
Loans and Other Lending Investments
Other Commitments [Line Items]
Performance-Based Commitments	317,091
Strategic Investments	0
Total	317,091
Real Estate
Other Commitments [Line Items]
Performance-Based Commitments	6,136
Strategic Investments	0
Total	6,136
Other Investments
Other Commitments [Line Items]
Performance-Based Commitments	50,933
Strategic Investments	45,642
Total	96,575
Loan participations, not the obligation of the Company
Other Commitments [Line Items]
Performance-Based Commitments	$ 115,300