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Secured Debt Arrangements, Net - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Details) - Line of Credit [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Line of Credit Facility [Line Items]
Securities sold under agreements to repurchase, gross	$ 1,226,786
Securities sold under agreements to repurchase, amortized cost of collateral	2,176,126
JP Morgan Facility [Member]
Line of Credit Facility [Line Items]
Securities sold under agreements to repurchase, gross	800,535
Securities sold under agreements to repurchase, amortized cost of collateral	1,372,877
Maximum Month-End Balance	914,040
Average Month-End Balance	786,087
DB Repurchase Facility [Member]
Line of Credit Facility [Line Items]
Securities sold under agreements to repurchase, gross	323,226
Securities sold under agreements to repurchase, amortized cost of collateral	623,006
Maximum Month-End Balance	329,689
Average Month-End Balance	326,536
Goldman Facility [Member]
Line of Credit Facility [Line Items]
Securities sold under agreements to repurchase, gross	103,025
Securities sold under agreements to repurchase, amortized cost of collateral	180,243
Maximum Month-End Balance	103,025
Average Month-End Balance	$ 87,312

X

- Definition

Securities Sold Under Agreements To Repurchase, Amortized Cost Of Collateral

+ References

No definition available.

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- Definition

Average amount borrowed under the credit facility during the period.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Maximum month-end amount borrowed under the credit facility during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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