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Borrowings Schedule of Debt Repayments (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
Reverse Repurchase Agreements [Member]  
Debt Instrument [Line Items]  
2017 Scheduled Repayment of Principal $ 936,105
2018 Scheduled Repayment of Principal 93,705
2019 Scheduled Repayment of Principal 0
2020 Scheduled Repayment of Principal 0
2021 Scheduled Repayment of Principal 0
2022 Scheduled Repayment of Principal 0
Total Scheduled Repayment of Principal 1,029,810
Other secured borrowings [Member]  
Debt Instrument [Line Items]  
2017 Scheduled Repayment of Principal 0
2018 Scheduled Repayment of Principal 46,899
2019 Scheduled Repayment of Principal 42,747
2020 Scheduled Repayment of Principal 0
2021 Scheduled Repayment of Principal 0
2022 Scheduled Repayment of Principal 0
Total Scheduled Repayment of Principal 89,646
Senior Notes [Member]  
Debt Instrument [Line Items]  
2017 Scheduled Repayment of Principal 0 [1]
2018 Scheduled Repayment of Principal 0 [1]
2019 Scheduled Repayment of Principal 0 [1]
2020 Scheduled Repayment of Principal 0 [1]
2021 Scheduled Repayment of Principal 0 [1]
2022 Scheduled Repayment of Principal 86,000 [1]
Total Scheduled Repayment of Principal 86,000 [1]
Total Borrowings [Member]  
Debt Instrument [Line Items]  
2017 Scheduled Repayment of Principal 936,105
2018 Scheduled Repayment of Principal 140,604
2019 Scheduled Repayment of Principal 42,747
2020 Scheduled Repayment of Principal 0
2021 Scheduled Repayment of Principal 0
2022 Scheduled Repayment of Principal 86,000
Total Scheduled Repayment of Principal $ 1,205,456
[1] Represents par value.