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Borrowings (Schedule of Debt Repayments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Repurchase Agreements    
Debt Instrument [Line Items]    
2019 Scheduled Repayment of Principal $ 1,621,376 $ 1,358,542
2020 Scheduled Repayment of Principal 350,369 78,530
2021 Scheduled Repayment of Principal 0 61,776
2022 Scheduled Repayment of Principal 84,677 0
2023 Scheduled Repayment of Principal 0 0
Total Scheduled Repayment of Principal 2,056,422 1,498,848
Other Secured Borrowings    
Debt Instrument [Line Items]    
2019 Scheduled Repayment of Principal 171,941 194,135
2020 Scheduled Repayment of Principal 109,920 205,198
2021 Scheduled Repayment of Principal 187,562 13,150
2022 Scheduled Repayment of Principal 80,336 0
2023 Scheduled Repayment of Principal 0 0
Total Scheduled Repayment of Principal 549,759 412,483
Senior Notes    
Debt Instrument [Line Items]    
2019 Scheduled Repayment of Principal 0 0
2020 Scheduled Repayment of Principal 0 0
2021 Scheduled Repayment of Principal 0 0
2022 Scheduled Repayment of Principal 86,000 86,000
2023 Scheduled Repayment of Principal 0 0
Total Scheduled Repayment of Principal 86,000 86,000
Total    
Debt Instrument [Line Items]    
2019 Scheduled Repayment of Principal 1,793,317 1,552,677
2020 Scheduled Repayment of Principal 460,289 283,728
2021 Scheduled Repayment of Principal 187,562 74,926
2022 Scheduled Repayment of Principal 251,013 86,000
2023 Scheduled Repayment of Principal 0 0
Total Scheduled Repayment of Principal $ 2,692,181 $ 1,997,331