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Business Combination - Bargain Purchase Gain (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Net income available to common stockholders	$ 46,155	$ 55,381	$ 48,512	$ 42,598	$ 34,322	$ 57,208	$ 26,925	$ 37,815	$ 192,646	$ 156,270	$ 127,581
Common shares outstanding (in shares)	133,853,565				107,121,235				133,853,565	107,121,235
Apollo Residential Mortgage, Inc. Merger [Member]
Business Acquisition [Line Items]
Total revenue											349,948
Net income available to common stockholders											$ 89,877
Common shares outstanding (in shares)											91,422,676
Net income per common share, basic and diluted (in dollars per share)											$ 0.98

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