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Borrowings Schedule of Debt Repayments (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Reverse Repurchase Agreements [Member]  
Debt Instrument [Line Items]  
2018 Scheduled Repayment of Principal $ 1,152,371 [1]
2019 Scheduled Repayment of Principal 0 [1]
2020 Scheduled Repayment of Principal 56,944 [1]
2021 Scheduled Repayment of Principal 0 [1]
2022 Scheduled Repayment of Principal 0 [1]
Total Scheduled Repayment of Principal 1,209,315 [1]
Other secured borrowings [Member]  
Debt Instrument [Line Items]  
2018 Scheduled Repayment of Principal 42,409 [2]
2019 Scheduled Repayment of Principal 140,608 [2]
2020 Scheduled Repayment of Principal 0 [2]
2021 Scheduled Repayment of Principal 0 [2]
2022 Scheduled Repayment of Principal 0 [2]
Total Scheduled Repayment of Principal 183,017 [2]
Senior Notes [Member]  
Debt Instrument [Line Items]  
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]  
2018 Scheduled Repayment of Principal 1,194,780
2019 Scheduled Repayment of Principal 140,608
2020 Scheduled Repayment of Principal 56,944
2021 Scheduled Repayment of Principal 0
2022 Scheduled Repayment of Principal 86,000
Total Scheduled Repayment of Principal $ 1,478,332
[1] Reflects the Company's contractual principal repayment dates.
[2] Reflects the Company's expected principal repayment dates.