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Corporate Debt - Schedule of Contractual Maturities of Corporate Debt (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Debt Disclosure [Abstract]  
2019 $ 110,100
2020 60,000
2021 60,000
2022 731,256
Thereafter 299,836
Total 1,261,192
PIK interest included in unpaid principal balance $ 45,900