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Allowance for Credit Losses - Financing Receivable Credit Quality (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Financing Receivable, Credit Quality Indicator      
Investments in leases - sales-type and financing receivable, Investments in loans and Other assets $ 17,024,805 $ 17,014,288 $ 11,632,123
B1      
Financing Receivable, Credit Quality Indicator      
Investments in leases - sales-type and financing receivable, Investments in loans and Other assets 15,761,205   9,889,284
B2      
Financing Receivable, Credit Quality Indicator      
Investments in leases - sales-type and financing receivable, Investments in loans and Other assets 917,138   901,005
B3      
Financing Receivable, Credit Quality Indicator      
Investments in leases - sales-type and financing receivable, Investments in loans and Other assets 281,450   280,485
N/A      
Financing Receivable, Credit Quality Indicator      
Investments in leases - sales-type and financing receivable, Investments in loans and Other assets 65,012   0
Ba2      
Financing Receivable, Credit Quality Indicator      
Investments in leases - sales-type and financing receivable, Investments in loans and Other assets 0   561,349
Ba3      
Financing Receivable, Credit Quality Indicator      
Investments in leases - sales-type and financing receivable, Investments in loans and Other assets $ 0   $ 0