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Secured Debt Arrangements, Net - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Details) - Line of Credit [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Line of Credit Facility [Line Items] |  |
Securities sold under agreements to repurchase, gross | $ 1,345,195 | $ 1,146,566
JP Morgan Chase [Member] |  |
Line of Credit Facility [Line Items] |  |
Securities sold under agreements to repurchase, gross | 944,529 | 657,452
Maximum Month-End Balance | 986,611 | 783,528
Average Month-End Balance | 863,717 | 660,741
Deutsche Bank Repurchase Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Securities sold under agreements to repurchase, gross | 319,286 | 137,355
Maximum Month-End Balance | 367,010 | 137,355
Average Month-End Balance | 288,966 | 19,582
Goldman Sachs Repurchase Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Securities sold under agreements to repurchase, gross | 81,380 | 40,657
Maximum Month-End Balance | 81,380 | 45,928
Average Month-End Balance | 40,514 | 43,505
UBS [Member] |  |
Line of Credit Facility [Line Items] |  |
Securities sold under agreements to repurchase, gross | 0 | 133,899
Maximum Month-End Balance | 133,899 | 133,899
Average Month-End Balance | 72,716 | 133,899
Deutsche Bank [Member] |  |
Line of Credit Facility [Line Items] |  |
Securities sold under agreements to repurchase, gross | 0 | 177,203
Maximum Month-End Balance | 177,203 | 300,005
Average Month-End Balance | $ 117,768 | $ 246,773

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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 + Details
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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 + Details
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