CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - Non Agency Residential Mortgage Backed Securities And Securitized Loans - Variable Interest Entities, Primary Beneficiary - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest income, assets of consolidated VIEs	$ 914,022	$ 678,623	$ 575,715
Interest expense, non-recourse liabilities of VIEs	$ 390,858	$ 249,708	$ 191,922