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Other Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Interest receivable $ 31,255 $ 23,101
Collateral deposited under derivative agreements 0 4,930
Other 639 389
Other Assets $ 31,894 $ 28,420