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Financing Agreements (Financing Agreements) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 26, 2020	Dec. 31, 2019
Financing Agreements [Line Items]
Unpaid Principal Balance	$ 5,047,981		$ 10,044,844
Fair value / Carrying Value	5,011,356		10,031,606
Agreements with non-mark-to-market collateral provisions
Financing Agreements [Line Items]
Unpaid Principal Balance	2,036,597
Amortized Cost Balance	2,036,597
Fair value / Carrying Value	2,036,597
Agreements with mark-to-market collateral provisions
Financing Agreements [Line Items]
Unpaid Principal Balance	1,656,248
Amortized Cost Balance	1,656,248
Fair value / Carrying Value	1,656,248	$ 1,650,000
Senior secured credit agreement
Financing Agreements [Line Items]
Unpaid Principal Balance	500,000
Amortized Cost Balance	480,959
Fair value / Carrying Value	480,959
Other
Financing Agreements [Line Items]
Unpaid Principal Balance	27,000
Amortized Cost Balance	18,360
Fair value / Carrying Value	20,520
Total Financing agreements, at fair value
Financing Agreements [Line Items]
Unpaid Principal Balance	4,219,845
Amortized Cost Balance	4,192,164
Fair value / Carrying Value	4,194,324
Repurchase agreements
Financing Agreements [Line Items]
Unpaid Principal Balance			9,140,944
Fair value / Carrying Value			9,139,821
Securitized debt
Financing Agreements [Line Items]
Unpaid Principal Balance	498,136		573,900
Fair value / Carrying Value	495,582		570,952
Convertible senior notes
Financing Agreements [Line Items]
Unpaid Principal Balance	230,000		230,000
Fair value / Carrying Value	224,563		223,971
Senior notes
Financing Agreements [Line Items]
Unpaid Principal Balance	100,000		100,000
Fair value / Carrying Value	96,887		$ 96,862
Total Financing agreements at carrying value
Financing Agreements [Line Items]
Unpaid Principal Balance	828,136
Fair value / Carrying Value	$ 817,032

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