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Business Combination - Bargain Purchase Gain (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Net income available to common stockholders	$ 49,716	$ 60,583	$ 4,478	$ 12,801	$ 21,378	$ 23,543	$ 22,798	$ 23,653	$ 127,581	$ 91,372	$ 75,299
Common shares outstanding (in shares)	91,422,676				67,195,252				91,422,676	67,195,252
Basic and diluted net income per share of common stock (in dollars per share)	$ 0.60	$ 0.83	$ 0.06	$ 0.18	$ 0.32	$ 0.39	$ 0.39	$ 0.47	$ 1.74	$ 1.54	$ 1.72
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				67,195,252				91,422,676	67,195,252
Basic and diluted net income per share of common stock (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=6928386&loc=d3e21463-112644

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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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=64863997&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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