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Schedule IV - Mortgage Loans On Real Estate - Rollforward of mortgage loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of period	$ 5,115,210	$ 3,890,751	$ 4,331,450
Additions during period:
Originations/acquisitions	10,607,896	5,741,427	4,983,049
Net discount accretion	0	0	330
Deductions during period:
Sales	(5,426,304)	(3,982,683)	(4,509,644)
Principal repayments	(843,984)	(576,620)	(879,188)
Reversal of provision for loan losses	0	0	7,102
Transfers to REO	(4,104)	(4,219)	(11,566)
Deconsolidation adjustments	0	0	(6,871)
Changes in fair value, net	91,884	46,554	(23,911)
Balance at end of period	$ 9,540,598	$ 5,115,210	$ 3,890,751

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- Definition

Mortgage Loans On Real Estate, Additions [Abstract]

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- Definition

Mortgage Loans On Real Estate, Deductions [Abstract]

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- Definition

Mortgage Loans On Real Estate, Net Discount Accretion

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- Definition

Mortgage Loans on Real Estate, Deconsolidation Adjustment

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- Definition

Mortgage Loans on Real Estate, Reversal Of Provision For Loan Losses

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- Definition

Mortgage Loans on Real Estate, Transfers To Real Estate Other

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- Definition

Mortgage Loans on Real Estate, Unrealized Gain (Loss) On Change In Fair Value

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- Definition

Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from collection of principal.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 6
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 6))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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- Definition

Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 6))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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- Definition

Amount of increase in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from new investment.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 6))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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