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Investments in Equity Affiliates, Operations (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statements of Operations:
Total revenues	$ 66,721		$ 50,072	$ 69,026	$ 94,921
Total expenses	61,149		45,471	186,762	91,757
Net income (loss)	54,089		37,402	(14,266)	67,409
Income from equity affiliates	20,408		3,264	24,401	5,415
Arbor Residential Investor LLC
Statements of Operations:
Total revenues				548,046	192,144
Total expenses				383,556	174,696
Net income (loss)				164,490	17,448
Arbor Residential Investor LLC | Residential Mortgage Banking Company
Statements of Operations:
Income from equity affiliates	$ 20,900		2,700	$ 23,800	3,500
Lexford Portfolio
Statements of Operations:
Distribution received		$ 1,100	$ 600		$ 1,900

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