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Business Combination - Bargain Purchase Gain (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Net income available to common stockholders	$ 34,322	$ 57,208	$ 26,925	$ 37,815	$ 49,716	$ 60,583	$ 4,478	$ 12,801	$ 156,270	$ 127,581	$ 91,372
Common shares outstanding (in shares)	107,121,235				91,422,676				107,121,235	91,422,676
Net income per common share, basic and diluted (in dollars per share)	$ 0.32	$ 0.54	$ 0.28	$ 0.41	$ 0.60	$ 0.83	$ 0.06	$ 0.18	$ 1.54	$ 1.74	$ 1.54
Apollo Residential Mortgage, Inc. Merger [Member]
Business Acquisition [Line Items]
Total revenue										$ 349,948	$ 352,264
Net income available to common stockholders										$ 89,877	$ 44,547
Common shares outstanding (in shares)					91,422,676					91,422,676	67,195,252
Net income per common share, basic and diluted (in dollars per share)										$ 0.98	$ 0.66

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Reference 1: 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(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1377-109256

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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