Consolidated Condensed Schedule Of Investments (Long Investments) - USD ($) shares in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2017		Dec. 31, 2016
Schedule of Investments [Line Items]
Fair Value		$ 1,864,213,000		$ 1,505,026,000
Investment Owned, at Cost		$ 1,876,105,000		$ 1,525,710,000
Percentage collaterallized by GNRCMO certificates		100.00%		100.00%
Non-performing loans, maturity date not applicable		$ 6,500,000		$ 28,600,000
Mortgage Loans in Process of Foreclosure, Amount		$ 5,600,000		$ 3,200,000
Unrated But Agency-Guaranteed [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity		167.23%		139.27%
Long Investment Aaa Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity		5.57%		0.84%
Long Investment Aa Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity				0.03%
Long Investment A Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity		0.05%		0.05%
Long Investment BBB Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity		3.76%		2.60%
Long Investment BB Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity		39.76%		30.24%
Long Investment Unrated Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity		68.48%		60.39%
Principal And Interest - Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		113.46%	[1],[2],[3],[4]	121.61%	[5],[6],[7],[8]
Fair Value		$ 742,563,000	[1],[3],[4]	$ 784,132,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 4.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 160,586,000	[1],[3],[4]	$ 147,479,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 169,590,000	[1],[3],[4]	$ 156,144,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 4.00% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2042-02	[1],[3],[4]	2042-02	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 4.00% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-03	[1],[3],[4]	2047-01	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Four Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 118,081,000	[1],[3],[4]	$ 121,756,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 124,658,000	[1],[3],[4]	$ 128,798,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Four Percent [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2041-11	[1],[3],[4]	2043-08	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Thirty Year) Four Percent [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-03	[1],[3],[4]	2047-01	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 4.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 64,139,000	[1],[3],[4]	$ 67,681,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Fair Value		$ 69,379,000	[1],[3],[4]	$ 73,305,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 4.50% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2041-10	[1],[3],[4]	2041-10	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 4.50% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2046-03	[1],[3],[4]	2046-03	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 3.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 65,926,000	[1],[3],[4]	$ 58,682,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Fair Value		$ 67,773,000	[1],[3],[4]	$ 60,451,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 3.50% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2042-09	[1],[3],[4]	2043-03	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 3.50% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-01	[1],[3],[4]	2047-01	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) 3.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 58,462,000	[1],[3],[4]	$ 51,402,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Fair Value		$ 61,368,000	[1],[3],[4]	$ 54,019,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) 3.50% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2028-03	[1],[3],[4]	2028-03	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) 3.50% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2032-03	[1],[3],[4]	2031-11	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Thirty Year) Five Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 44,917,000	[1],[3],[4]	$ 44,796,000	[5],[7],[8]
Rate		5.00%	[1],[3],[4]	5.00%	[5],[7],[8]
Fair Value		$ 49,187,000	[1],[3],[4]	$ 49,062,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Thirty Year) Five Percent [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2035-10	[1],[3],[4]	2035-10	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Thirty Year) Five Percent [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2044-12	[1],[3],[4]	2044-12	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 4.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 41,294,000	[1],[3],[4]	$ 40,722,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Fair Value		$ 44,607,000	[1],[3],[4]	$ 44,010,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 4.50% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2043-09	[1],[3],[4]	2043-09	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 4.50% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-03	[1],[3],[4]	2046-09	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 3.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 25,630,000	[1],[3],[4]	$ 25,244,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Fair Value		$ 26,356,000	[1],[3],[4]	$ 25,993,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 3.50% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2042-01	[1],[3],[4]	2042-01	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 3.50% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-02	[1],[3],[4]	2047-01	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) 3.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 17,630,000	[1],[3],[4]	$ 22,073,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Fair Value		$ 18,134,000	[1],[3],[4]	$ 22,730,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) 3.00% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2030-04	[1],[3],[4]	2030-04	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) 3.00% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2032-01	[1],[3],[4]	2032-01	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (30 Year) 4.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 16,364,000	[1],[3],[4]	$ 21,855,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 17,363,000	[1],[3],[4]	$ 23,346,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (30 Year) 4.00% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2045-06	[1],[3],[4]	2045-06	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (30 Year) 4.00% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-03	[1],[3],[4]	2046-12	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (15 Year) 3.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 10,054,000	[1],[3],[4]	$ 9,219,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Fair Value		$ 10,549,000	[1],[3],[4]	$ 9,686,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (15 Year) 3.50% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2028-09	[1],[3],[4]	2028-09	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (15 Year) 3.50% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2032-03	[1],[3],[4]	2030-09	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.60% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[5],[7],[8]			$ 10,504,000
Rate	[5],[7],[8]			4.60%
Fair Value	[5],[7],[8]			$ 11,351,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.60% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2063-12
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.60% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2064-11
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Other) 3.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 9,999,000	[1],[3],[4]	$ 10,120,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Fair Value		$ 10,255,000	[1],[3],[4]	$ 10,379,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Other) 3.50% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2030-02	[1],[3],[4]	2030-02	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Other) 3.50% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2046-09	[1],[3],[4]	2046-09	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) 4.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 9,557,000	[1],[3],[4]	$ 9,968,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 10,132,000	[1],[3],[4]	$ 10,596,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) 4.00% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2026-06	[1],[3],[4]	2026-06	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) 4.00% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2031-05	[1],[3],[4]	2031-05	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (30 Year) 4.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 9,398,000	[1],[3],[4]	$ 6,568,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Fair Value		$ 10,115,000	[1],[3],[4]	$ 7,099,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (30 Year) 4.50% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2045-08	[1],[3],[4]	2045-08	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (30 Year) 4.50% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-02	[1],[3],[4]	2046-09	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Four Point Six Eight Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[5],[7],[8]			$ 6,200,000
Rate	[5],[7],[8]			4.68%
Fair Value	[5],[7],[8]			$ 6,703,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Four Point Six Eight Percent [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2063-11
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Four Point Six Eight Percent [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2064-09
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Other) 5.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 6,588,000	[1],[3],[4]	$ 6,714,000	[5],[7],[8]
Rate		5.00%	[1],[3],[4]	5.00%	[5],[7],[8]
Fair Value		$ 7,296,000	[1],[3],[4]	$ 7,408,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Other) 5.00% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2043-09	[1],[3],[4]	2043-09	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Other) 5.00% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2044-01	[1],[3],[4]	2044-01	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (30 Year) 3.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 5,289,000	[1],[3],[4]	$ 6,231,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Fair Value		$ 5,500,000	[1],[3],[4]	$ 6,513,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (30 Year) 3.50% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2046-11	[1],[3],[4]	2046-02	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (30 Year) 3.50% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-03	[1],[3],[4]	2046-12	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.55% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2065-01
Current Principal/Notional Amount	[5],[7],[8]			$ 5,219,000
Rate	[5],[7],[8]			4.55%
Fair Value	[5],[7],[8]			$ 5,648,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.44% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2066-11
Current Principal/Notional Amount	[5],[7],[8]			$ 4,942,000
Rate	[5],[7],[8]			4.44%
Fair Value	[5],[7],[8]			$ 5,383,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Four Point Six One Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2064-11
Current Principal/Notional Amount	[5],[7],[8]			$ 3,892,000
Rate	[5],[7],[8]			4.61%
Fair Value	[5],[7],[8]			$ 4,216,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Other) 4.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2041-05
Current Principal/Notional Amount	[1],[3],[4]	$ 4,219,000
Rate	[1],[3],[4]	4.50%
Fair Value	[1],[3],[4]	$ 4,468,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (15 Year) 4.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2026-04	[1],[3],[4]	2026-04	[5],[7],[8]
Current Principal/Notional Amount		$ 3,482,000	[1],[3],[4]	$ 3,619,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Fair Value		$ 3,752,000	[1],[3],[4]	$ 3,905,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.42% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2061-07
Current Principal/Notional Amount	[5],[7],[8]			$ 3,518,000
Rate	[5],[7],[8]			4.42%
Fair Value	[5],[7],[8]			$ 3,741,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (30 Year) 2.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2046-10	[1],[3],[4]	2046-10	[5],[7],[8]
Current Principal/Notional Amount		$ 3,490,000	[1],[3],[4]	$ 3,513,000	[5],[7],[8]
Rate		2.50%	[1],[3],[4]	2.50%	[5],[7],[8]
Fair Value		$ 3,383,000	[1],[3],[4]	$ 3,414,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.48% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2064-11
Current Principal/Notional Amount	[5],[7],[8]			$ 3,123,000
Rate	[5],[7],[8]			4.48%
Fair Value	[5],[7],[8]			$ 3,361,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Four Point Six Two Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2064-10
Current Principal/Notional Amount	[5],[7],[8]			$ 3,043,000
Rate	[5],[7],[8]			4.62%
Fair Value	[5],[7],[8]			$ 3,303,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Corporation Pools (15 Year) 3.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2030-04	[1],[3],[4]	2030-04	[5],[7],[8]
Current Principal/Notional Amount		$ 2,981,000	[1],[3],[4]	$ 3,030,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Fair Value		$ 3,066,000	[1],[3],[4]	$ 3,119,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Other) 3.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 2,972,000	[1],[3],[4]	$ 3,030,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Fair Value		$ 3,048,000	[1],[3],[4]	$ 3,109,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Other) 3.00% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2028-06	[1],[3],[4]	2028-06	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Other) 3.00% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2030-03	[1],[3],[4]	2030-03	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (Other) 4.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2044-05	[1],[3],[4]	2044-05	[5],[7],[8]
Current Principal/Notional Amount		$ 2,712,000	[1],[3],[4]	$ 2,726,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Fair Value		$ 2,947,000	[1],[3],[4]	$ 2,968,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.57% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2065-01
Current Principal/Notional Amount	[5],[7],[8]			$ 2,945,000
Rate	[5],[7],[8]			4.57%
Fair Value	[5],[7],[8]			$ 3,186,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 5.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2039-10	[1],[3],[4]	2039-10	[5],[7],[8]
Current Principal/Notional Amount		$ 2,376,000	[1],[3],[4]	$ 2,896,000	[5],[7],[8]
Rate		5.50%	[1],[3],[4]	5.50%	[5],[7],[8]
Fair Value		$ 2,634,000	[1],[3],[4]	$ 3,216,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 6.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 1,784,000	[1],[3],[4]	$ 1,793,000	[5],[7],[8]
Rate		6.00%	[1],[3],[4]	6.00%	[5],[7],[8]
Fair Value		$ 2,042,000	[1],[3],[4]	$ 2,049,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 6.00% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2039-09	[1],[3],[4]	2039-09	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 6.00% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2040-02	[1],[3],[4]	2040-02	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Four Point Six Four Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2065-03
Current Principal/Notional Amount	[5],[7],[8]			$ 2,459,000
Rate	[5],[7],[8]			4.64%
Fair Value	[5],[7],[8]			$ 2,672,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pool (Other) Five Point Four Nine Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2060-04
Current Principal/Notional Amount	[5],[7],[8]			$ 2,433,000
Rate	[5],[7],[8]			5.49%
Fair Value	[5],[7],[8]			$ 2,551,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Thirty Year) Three Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 1,999,000	[1],[3],[4]	$ 2,195,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Fair Value		$ 2,003,000	[1],[3],[4]	$ 2,193,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Thirty Year) Three Percent [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2042-01	[1],[3],[4]	2042-01	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Thirty Year) Three Percent [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2045-06	[1],[3],[4]	2045-06	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (20 Year) 4.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2033-12	[1],[3],[4]	2033-12	[5],[7],[8]
Current Principal/Notional Amount		$ 1,871,000	[1],[3],[4]	$ 2,043,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 1,986,000	[1],[3],[4]	$ 2,172,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) Four Point Six Three Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2064-06
Current Principal/Notional Amount	[5],[7],[8]			$ 1,943,000
Rate	[5],[7],[8]			4.63%
Fair Value	[5],[7],[8]			$ 2,103,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 5.51% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2060-02
Current Principal/Notional Amount	[5],[7],[8]			$ 1,916,000
Rate	[5],[7],[8]			5.51%
Fair Value	[5],[7],[8]			$ 2,016,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (15 Year) 4.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2029-02	[1],[3],[4]	2029-02	[5],[7],[8]
Current Principal/Notional Amount		$ 1,707,000	[1],[3],[4]	$ 1,734,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 1,808,000	[1],[3],[4]	$ 1,842,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 5.57% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2060-02
Current Principal/Notional Amount	[5],[7],[8]			$ 1,675,000
Rate	[5],[7],[8]			5.57%
Fair Value	[5],[7],[8]			$ 1,756,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 3.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 1,611,000	[1],[3],[4]	$ 1,689,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Fair Value		$ 1,614,000	[1],[3],[4]	$ 1,694,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 3.00% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2030-05	[1],[3],[4]	2030-05	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 3.00% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2030-06	[1],[3],[4]	2030-06	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 3.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 1,449,000	[1],[3],[4]	$ 1,523,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Fair Value		$ 1,447,000	[1],[3],[4]	$ 1,518,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 3.00% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2043-07	[1],[3],[4]	2043-07	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 3.00% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2045-10	[1],[3],[4]	2045-10	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 6.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 1,108,000	[1],[3],[4]	$ 1,369,000	[5],[7],[8]
Rate		6.00%	[1],[3],[4]	6.00%	[5],[7],[8]
Fair Value		$ 1,251,000	[1],[3],[4]	$ 1,553,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 6.00% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2039-04	[1],[3],[4]	2039-04	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 6.00% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2040-05	[1],[3],[4]	2040-05	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (20 Year) 4.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2033-12		2033-12	[5],[7],[8]
Current Principal/Notional Amount		$ 1,144,000	[1],[3],[4]	$ 1,156,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Fair Value		$ 1,241,000	[1],[3],[4]	$ 1,254,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Other) 3.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2043-06	[1],[3],[4]	2043-06	[5],[7],[8]
Current Principal/Notional Amount		$ 1,234,000	[1],[3],[4]	$ 1,275,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Fair Value		$ 1,215,000	[1],[3],[4]	$ 1,258,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 3.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2030-10
Current Principal/Notional Amount		$ 670,000	[1],[3],[4]	$ 165,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Fair Value		$ 679,000	[1],[3],[4]	$ 168,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 3.50% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2030-10
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 3.50% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2032-02
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Other) Three Point Five Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2026-04
Current Principal/Notional Amount	[1],[3],[4]	$ 580,000
Rate	[1],[3],[4]	3.50%
Fair Value	[1],[3],[4]	$ 597,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30Year) 5.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2044-07	[1],[3],[4]	2044-07	[5],[7],[8]
Current Principal/Notional Amount		$ 496,000	[1],[3],[4]	$ 498,000	[5],[7],[8]
Rate		5.00%	[1],[3],[4]	5.00%	[5],[7],[8]
Fair Value		$ 541,000	[1],[3],[4]	$ 543,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 5.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2033-08	[1],[3],[4]	2033-08	[5],[7],[8]
Current Principal/Notional Amount		$ 461,000	[1],[3],[4]	$ 496,000	[5],[7],[8]
Rate		5.50%	[1],[3],[4]	5.50%	[5],[7],[8]
Fair Value		$ 513,000	[1],[3],[4]	$ 551,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (Other) 4.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2037-06	[1],[3],[4]	2037-06	[5],[7],[8]
Current Principal/Notional Amount		$ 63,000	[1],[3],[4]	$ 75,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 66,000	[1],[3],[4]	$ 77,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		1.87%	[1],[2],[3],[4]	1.89%	[5],[6],[7],[8]
Fair Value		$ 12,242,000	[1],[3],[4]	$ 12,189,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association 4.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 25,766,000	[1],[3],[4]	$ 26,883,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 4,484,000	[1],[3],[4]	$ 4,547,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association 4.00% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2045-02	[1],[3],[4]	2045-02	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association 4.00% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2045-06	[1],[3],[4]	2045-06	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association 4.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 8,750,000	[1],[3],[4]	$ 9,820,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Fair Value		$ 1,328,000	[1],[3],[4]	$ 1,414,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association 4.50% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2020-12	[1],[3],[4]	2020-12	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association 4.50% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2044-06	[1],[3],[4]	2044-06	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association 4.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2041-02
Current Principal/Notional Amount		$ 6,522,000	[1],[3],[4]	$ 3,844,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Fair Value		$ 1,168,000	[1],[3],[4]	$ 615,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association 4.50% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2041-02
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association 4.50% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2044-07
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association 5.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2043-11	[1],[3],[4]	2043-11	[5],[7],[8]
Current Principal/Notional Amount		$ 5,818,000	[1],[3],[4]	$ 6,303,000	[5],[7],[8]
Rate		5.50%	[1],[3],[4]	5.50%	[5],[7],[8]
Fair Value		$ 1,038,000	[1],[3],[4]	$ 1,137,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Three Point Five Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2032-12	[1],[3],[4]	2032-12	[5],[7],[8]
Current Principal/Notional Amount		$ 4,923,000	[1],[3],[4]	$ 5,099,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Fair Value		$ 775,000	[1],[3],[4]	$ 808,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association 5.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 5,955,000	[1],[3],[4]	$ 6,695,000	[5],[7],[8]
Rate		5.00%	[1],[3],[4]	5.00%	[5],[7],[8]
Fair Value		$ 746,000	[1],[3],[4]	$ 806,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association 5.00% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2038-01	[1],[3],[4]	2038-01	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association 5.00% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2040-05	[1],[3],[4]	2040-05	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association 4.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 5,190,000	[1],[3],[4]	$ 5,354,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 644,000	[1],[3],[4]	$ 648,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association 4.00% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2039-05	[1],[3],[4]	2039-05	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association 4.00% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2043-11	[1],[3],[4]	2043-11	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association 6.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2040-01	[1],[3],[4]	2040-01	[5],[7],[8]
Current Principal/Notional Amount		$ 2,472,000	[1],[3],[4]	$ 2,661,000	[5],[7],[8]
Rate		6.00%	[1],[3],[4]	6.00%	[5],[7],[8]
Fair Value		$ 476,000	[1],[3],[4]	$ 512,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association 0.26% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2040-06	[1],[3],[4]	2040-06	[5],[7],[8]
Current Principal/Notional Amount		$ 80,615,000	[1],[3],[4]	$ 81,664,000	[5],[7],[8]
Rate		0.26%	[1],[3],[4]	0.26%	[5],[7],[8]
Fair Value		$ 453,000	[1],[3],[4]	$ 472,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Three Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2041-09	[1],[3],[4]	2041-09	[5],[7],[8]
Current Principal/Notional Amount		$ 3,036,000	[1],[3],[4]	$ 3,167,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Fair Value		$ 306,000	[1],[3],[4]	$ 321,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Six Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2038-06	[1],[3],[4]	2038-06	[5],[7],[8]
Current Principal/Notional Amount		$ 1,061,000	[1],[3],[4]	$ 1,123,000	[5],[7],[8]
Rate		6.00%	[1],[3],[4]	6.00%	[5],[7],[8]
Fair Value		$ 249,000	[1],[3],[4]	$ 263,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association 4.75% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2040-07	[1],[3],[4]	2040-07	[5],[7],[8]
Current Principal/Notional Amount		$ 1,295,000	[1],[3],[4]	$ 1,396,000	[5],[7],[8]
Rate		4.75%	[1],[3],[4]	4.75%	[5],[7],[8]
Fair Value		$ 239,000	[1],[3],[4]	$ 253,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Five Point Five Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2040-10	[1],[3],[4]	2040-10	[5],[7],[8]
Current Principal/Notional Amount		$ 1,110,000	[1],[3],[4]	$ 1,201,000	[5],[7],[8]
Rate		5.50%	[1],[3],[4]	5.50%	[5],[7],[8]
Fair Value		$ 144,000	[1],[3],[4]	$ 163,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Five Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2037-05	[1],[3],[4]	2037-05	[5],[7],[8]
Current Principal/Notional Amount		$ 1,993,000	[1],[3],[4]	$ 2,289,000	[5],[7],[8]
Rate		5.00%	[1],[3],[4]	5.00%	[5],[7],[8]
Fair Value		$ 123,000	[1],[3],[4]	$ 151,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Five Point FIve Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2039-01	[1],[3],[4]	2039-01	[5],[7],[8]
Current Principal/Notional Amount		$ 685,000	[1],[3],[4]	$ 763,000	[5],[7],[8]
Rate		5.50%	[1],[3],[4]	5.50%	[5],[7],[8]
Fair Value		$ 69,000	[1],[3],[4]	$ 79,000	[5],[7],[8]
TBA - Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		38.68%	[1],[2],[3],[4]	10.94%	[5],[6],[7],[8]
Current Principal/Notional Amount		$ 243,982,000		$ 67,720,000
Fair Value		$ 253,146,000	[1],[3],[4]	$ 70,525,000	[5],[7],[8]
TBA - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association (30 Year) 4.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2017-04
Current Principal/Notional Amount	[1],[3],[4]	$ 57,242,000
Rate	[1],[3],[4]	4.00%
Fair Value	[1],[3],[4]	$ 60,037,000
TBA - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association (15 Year) 3.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2017-04	[1],[3],[4]	2017-01	[5],[7],[8]
Current Principal/Notional Amount		$ 56,760,000	[1],[3],[4]	$ 14,620,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Fair Value		$ 59,073,000	[1],[3],[4]	$ 15,231,000	[5],[7],[8]
TBA - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association (30 year) 3.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2017-04
Current Principal/Notional Amount	[1],[3],[4]	$ 53,000,000
Rate	[1],[3],[4]	3.50%
Fair Value	[1],[3],[4]	$ 54,207,000
TBA - Fixed Rate Agency Securities [Member] | Government National Mortgage Association (30 Year) 4 Point 00 Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2017-04	[1],[3],[4]	2017-01	[5],[7],[8]
Current Principal/Notional Amount		$ 28,840,000	[1],[3],[4]	$ 24,540,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 30,454,000	[1],[3],[4]	$ 26,047,000	[5],[7],[8]
TBA - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation (30 Year) 3 Point 50 Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2017-04	[1],[3],[4]	2017-01	[5],[7],[8]
Current Principal/Notional Amount		$ 26,260,000	[1],[3],[4]	$ 28,560,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Fair Value		$ 26,859,000	[1],[3],[4]	$ 29,247,000	[5],[7],[8]
TBA - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association (15 Year) 3.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2017-04
Current Principal/Notional Amount	[1],[3],[4]	$ 19,180,000
Rate	[1],[3],[4]	3.00%
Fair Value	[1],[3],[4]	$ 19,665,000
TBA - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation (30 Year) 4 Point 00 Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2017-04
Current Principal/Notional Amount	[1],[3],[4]	$ 1,700,000
Rate	[1],[3],[4]	4.00%
Fair Value	[1],[3],[4]	$ 1,783,000
TBA - Fixed Rate Agency Securities [Member] | Government National Mortgage Association (30 Year) 4.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2017-04
Current Principal/Notional Amount	[1],[3],[4]	$ 1,000,000
Rate	[1],[3],[4]	4.50%
Fair Value	[1],[3],[4]	$ 1,068,000
Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		154.01%	[1],[2],[3],[4]	134.44%	[5],[6],[7],[8]
Fair Value		$ 1,007,951,000	[1],[3],[4]	$ 866,846,000	[5],[7],[8]
Investment Owned, at Cost		$ 1,011,085,000	[1],[3],[4]	$ 869,071,000	[5],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		10.59%	[1],[2],[3],[4]	2.12%	[5],[6],[7],[8]
Fair Value		$ 69,300,000	[1],[3],[4]	$ 13,688,000	[5],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Government National Mortgage Association Pools [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2064-11
Current Principal/Notional Amount		54,138,000	[1],[3],[4]	$ 2,097,000	[5],[7],[8]
Rate	[5],[7],[8]			2.89%
Fair Value		$ 58,301,000	[1],[3],[4]	$ 2,231,000	[5],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Government National Mortgage Association Pools [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2060-02
Rate	[1],[3],[4]	3.14%
Principal And Interest - Floating Rate Agency Securities [Member] | Government National Mortgage Association Pools [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2066-11
Rate	[1],[3],[4]	5.57%
Principal And Interest - Floating Rate Agency Securities [Member] | Federal National Mortgage Association Pools [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 5,827,000	[1],[3],[4]	5,876,000	[5],[7],[8]
Fair Value		$ 6,081,000	[1],[3],[4]	$ 6,129,000	[5],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Federal National Mortgage Association Pools [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2035-09	[1],[3],[4]	2035-09	[5],[7],[8]
Rate		2.79%	[1],[3],[4]	2.55%	[5],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Federal National Mortgage Association Pools [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2045-05	[1],[3],[4]	2045-05	[5],[7],[8]
Rate		5.94%	[1],[3],[4]	5.94%	[5],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 4,752,000	[1],[3],[4]	$ 5,122,000	[5],[7],[8]
Fair Value		$ 4,918,000	[1],[3],[4]	$ 5,328,000	[5],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2037-06	[1],[3],[4]	2037-06	[5],[7],[8]
Rate		3.12%	[1],[3],[4]	3.12%	[5],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2044-05	[1],[3],[4]	2044-05	[5],[7],[8]
Rate		5.96%	[1],[3],[4]	5.97%	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		2.63%	[1],[2],[3],[4]	2.71%	[5],[6],[7],[8]
Fair Value		$ 17,183,000	[1],[3],[4]	$ 17,433,000	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Government National Mortgage Association [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		235,802,000	[1],[3],[4]	228,955,000	[5],[7],[8]
Fair Value		$ 13,978,000	[1],[3],[4]	$ 13,831,000	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Government National Mortgage Association [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2037-05	[1],[3],[4]	2037-05	[5],[7],[8]
Rate		0.42%	[1],[3],[4]	0.40%	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Government National Mortgage Association [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2064-11	[1],[3],[4]	2064-11	[5],[7],[8]
Rate		5.87%	[1],[3],[4]	6.09%	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Federal National Mortgage Association [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 12,042,000	[1],[3],[4]	$ 12,928,000	[5],[7],[8]
Fair Value		$ 1,670,000	[1],[3],[4]	$ 1,867,000	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Federal National Mortgage Association [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2033-06	[1],[3],[4]	2033-06	[5],[7],[8]
Rate		5.17%	[1],[3],[4]	5.39%	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Federal National Mortgage Association [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2041-12	[1],[3],[4]	2041-12	[5],[7],[8]
Rate		6.57%	[1],[3],[4]	6.79%	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 4,995,000	[1],[3],[4]	$ 5,182,000	[5],[7],[8]
Fair Value		$ 824,000	[1],[3],[4]	$ 865,000	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2036-03	[1],[3],[4]	2036-03	[5],[7],[8]
Rate		5.09%	[1],[3],[4]	5.30%	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2039-08	[1],[3],[4]	2039-08	[5],[7],[8]
Rate		5.72%	[1],[3],[4]	5.93%	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member] | Resecuritization of Government National Mortgage Association [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2060-08	[1],[3],[4],[9]	2060-08	[5],[7],[8],[10]
Current Principal/Notional Amount		$ 14,905,000	[1],[3],[4],[9]	$ 15,902,000	[5],[7],[8],[10]
Rate		3.95%	[1],[3],[4],[9]	3.95%	[5],[7],[8],[10]
Fair Value		$ 711,000	[1],[3],[4],[9]	$ 870,000	[5],[7],[8],[10]
Floating Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		13.22%	[1],[2],[3],[4]	4.83%	[5],[6],[7],[8]
Fair Value		$ 86,483,000	[1],[3],[4]	$ 31,121,000	[5],[7],[8]
Investment Owned, at Cost		$ 87,238,000	[1],[3],[4]	$ 31,069,000	[5],[7],[8]
Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		167.23%	[1],[2],[3],[4]	139.27%	[5],[6],[7],[8]
Fair Value		$ 1,094,434,000	[1],[3],[4]	$ 897,967,000	[5],[7],[8]
Investment Owned, at Cost		$ 1,098,323,000	[1],[3],[4]	$ 900,140,000	[5],[7],[8]
Principal And Interest - Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		23.41%	[2],[3],[4]	28.17%	[6],[7],[8]
Fair Value		$ 153,206,000	[3],[4]	$ 181,649,000	[7],[8]
Investment Owned, at Cost		$ 153,227,000	[3],[4]	$ 184,417,000	[7],[8]
Principal And Interest - Private Label Securities [Member] | North America [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		15.68%	[2],[3],[4]	20.48%	[6],[7],[8]
Fair Value		$ 102,628,000	[3],[4]	$ 132,071,000	[7],[8]
Investment Owned, at Cost		$ 96,689,000	[3],[4]	$ 125,106,000	[7],[8]
Principal And Interest - Private Label Securities [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		7.73%	[2],[3],[4]	7.69%	[6],[7],[8]
Fair Value		$ 50,578,000	[3],[4]	$ 49,578,000	[7],[8]
Investment Owned, at Cost		56,538,000	[3],[4]	59,311,000	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Mortgage-related Commercial [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		111,630,000	[3],[4]	119,636,000	[7],[8]
Fair Value		26,981,000	[3],[4]	30,334,000	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Mortgage-related Commercial [Member] | Europe [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		8,601,000	[3],[4]	9,361,000	[7],[8]
Fair Value		10,007,000	[3],[4]	8,680,000	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		194,486,000	[3],[4]	233,890,000	[7],[8]
Fair Value		75,647,000	[3],[4]	101,737,000	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Mortgage-related Residential [Member] | Europe [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		61,532,000	[3],[4]	63,244,000	[7],[8]
Fair Value		$ 40,571,000	[3],[4]	$ 40,898,000	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member] | Mortgage-related Commercial [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2045-07	[3],[4]	2045-07	[7],[8]
Rate		2.31%	[3],[4]	2.31%	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member] | Mortgage-related Commercial [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date		2017-06	[3],[4]	2017-06	[7],[8]
Rate		0.00%	[3],[4]	0.00%	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2019-05	[3],[4]	2019-05	[7],[8]
Rate		0.00%	[3],[4]	0.00%	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member] | Mortgage-related Residential [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date		2025-06	[3],[4]	2025-06	[7],[8]
Rate		0.00%	[3],[4]	0.00%	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member] | Mortgage-related Commercial [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2049-12	[3],[4]	2049-12	[7],[8]
Rate		4.56%	[3],[4]	4.41%	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member] | Mortgage-related Commercial [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date		2039-02	[3],[4]	2039-02	[7],[8]
Rate		11.00%	[3],[4]	11.00%	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2046-09	[3],[4]	2046-09	[7],[8]
Rate		14.92%	[3],[4]	9.35%	[7],[8]
Principal And Interest - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member] | Mortgage-related Residential [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date		2040-03	[3],[4]	2040-03	[7],[8]
Rate		5.11%	[3],[4]	5.15%	[7],[8]
Interest Only - Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		1.46%	[2],[3],[4]	0.81%	[6],[7],[8]
Fair Value		$ 9,561,000	[3],[4]	$ 5,227,000	[7],[8]
Investment Owned, at Cost		7,820,000	[3],[4]	4,963,000	[7],[8]
Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Mortgage-related Commercial [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		72,535,000	[3],[4]	72,535,000	[7],[8]
Fair Value		4,312,000	[3],[4]	4,254,000	[7],[8]
Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		40,647,000	[3],[4]	36,498,000	[7],[8]
Fair Value		$ 5,249,000	[3],[4]	$ 973,000	[7],[8]
Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member] | Mortgage-related Commercial [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-10	[3],[4]	2047-10	[7],[8]
Rate		1.25%	[3],[4]	1.25%	[7],[8]
Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2030-12	[3],[4]	2044-06	[7],[8]
Rate		0.00%	[3],[4]	0.50%	[7],[8]
Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member] | Mortgage-related Commercial [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2049-12	[3],[4]	2049-12	[7],[8]
Rate		2.00%	[3],[4]	2.71%	[7],[8]
Interest Only - Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-09	[3],[4]	2047-09	[7],[8]
Rate		2.00%	[3],[4]	2.00%	[7],[8]
Other Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		0.00%	[2],[3],[4]	0.00%	[6],[7],[8]
Fair Value		$ 0	[3],[4]	$ 0	[7],[8]
Investment Owned, at Cost		234,000	[3],[4]	245,000	[7],[8]
Other Private Label Securities [Member] | Various Issuer [Member] | Mortgage-related Commercial [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 0	[3],[4]	$ 0	[7],[8]
Rate		0.00%	[3],[4]	0.00%	[7],[8]
Fair Value		$ 0	[3],[4]	$ 0	[7],[8]
Other Private Label Securities [Member] | Various Issuer [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2037-06	[3],[4]	2037-06	[7],[8]
Current Principal/Notional Amount		$ 86,538,000	[3],[4]	$ 90,639,000	[7],[8]
Rate		0.00%	[3],[4]	0.00%	[7],[8]
Fair Value		$ 0	[3],[4]	$ 0	[7],[8]
Other Private Label Securities [Member] | Various Issuer [Member] | Minimum [Member] | Mortgage-related Commercial [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2045-07	[3],[4]	2045-07	[7],[8]
Other Private Label Securities [Member] | Various Issuer [Member] | Maximum [Member] | Mortgage-related Commercial [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2049-12	[3],[4]	2049-12	[7],[8]
Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		24.87%	[2],[3],[4]	28.98%	[6],[7],[8]
Fair Value		$ 162,767,000	[3],[4]	$ 186,876,000	[7],[8]
Investment Owned, at Cost		$ 161,281,000	[3],[4]	$ 189,625,000	[7],[8]
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		192.10%	[2],[3],[4]	168.25%	[6],[7],[8]
Fair Value		$ 1,257,201,000	[3],[4]	$ 1,084,843,000	[7],[8]
Investment Owned, at Cost		$ 1,259,604,000	[3],[4]	$ 1,089,765,000	[7],[8]
Collateralized Loan Obligations [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		10.78%	[2],[3],[4]	6.97%	[6],[7],[8]
Fair Value		$ 70,561,000	[3],[4]	$ 44,956,000	[7],[8]
Investment Owned, at Cost		$ 72,160,000	[3],[4]	$ 49,087,000	[7],[8]
Collateralized Loan Obligations [Member] | North America [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		6.56%	[2],[3],[4]	3.49%	[6],[7],[8]
Fair Value		$ 42,937,000	[3],[4]	$ 22,519,000	[7],[8]
Investment Owned, at Cost		$ 44,883,000	[3],[4]	$ 25,860,000	[7],[8]
Collateralized Loan Obligations [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		4.22%	[2],[3],[4]	3.48%	[6],[7],[8]
Fair Value		$ 27,624,000	[3],[4]	$ 22,437,000	[7],[8]
Investment Owned, at Cost		27,277,000	[3],[4]	23,227,000	[7],[8]
Collateralized Loan Obligations [Member] | Various Issuer [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		93,671,000	[3],[4]	69,917,000	[7],[8]
Fair Value		42,937,000	[3],[4]	22,519,000	[7],[8]
Collateralized Loan Obligations [Member] | Various Issuer [Member] | Europe [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		32,818,000	[3],[4]	28,053,000	[7],[8]
Fair Value		$ 27,624,000	[3],[4]	$ 22,437,000	[7],[8]
Collateralized Loan Obligations [Member] | Various Issuer [Member] | Minimum [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2017-11	[3],[4]	2017-11	[7],[8]
Rate		0.00%	[3],[4]	0.00%	[7],[8]
Collateralized Loan Obligations [Member] | Various Issuer [Member] | Minimum [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date		2021-11	[3],[4]	2022-01	[7],[8]
Rate		0.00%	[3],[4]	0.00%	[7],[8]
Collateralized Loan Obligations [Member] | Various Issuer [Member] | Maximum [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2025-04	[3],[4]	2024-06	[7],[8]
Rate		9.57%	[3],[4]	7.88%	[7],[8]
Collateralized Loan Obligations [Member] | Various Issuer [Member] | Maximum [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date		2026-10	[3],[4]	2025-03	[7],[8]
Rate		4.89%	[3],[4]	3.84%	[7],[8]
Consumer loans and asset-backed securities backed by consumer loans [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		17.46%	[2],[3],[4],[11]	17.76%	[6],[7],[8],[12]
Fair Value		$ 114,278,000	[3],[4],[11]	$ 114,472,000	[7],[8],[12]
Investment Owned, at Cost		121,697,000	[3],[4],[11]	122,538,000	[7],[8],[12]
Fair value of loans held in related party trust		$ 86,700,000		$ 43,200,000
Consumer loans and asset-backed securities backed by consumer loans [Member] | North America [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		17.01%	[2],[3],[4],[11]	17.28%	[6],[7],[8],[12]
Fair Value		$ 111,321,000	[3],[4],[11]	$ 111,423,000	[7],[8],[12]
Investment Owned, at Cost		$ 120,346,000	[3],[4],[11]	$ 120,405,000	[7],[8],[12]
Consumer loans and asset-backed securities backed by consumer loans [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		0.45%	[2],[3],[4],[11]	0.48%	[6],[7],[8],[12]
Fair Value		$ 2,957,000	[3],[4],[11]	$ 3,049,000	[7],[8],[12]
Investment Owned, at Cost		1,351,000	[3],[4],[11]	2,133,000	[7],[8],[12]
Consumer loans and asset-backed securities backed by consumer loans [Member] | Various Issuer [Member] | Consumer [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		104,225,000	[3],[4],[11],[13],[14],[15]	103,536,000	[7],[8],[12],[16],[17],[18]
Fair Value		111,321,000	[3],[4],[11],[13],[14],[15]	111,423,000	[7],[8],[12],[16],[17],[18]
Consumer loans and asset-backed securities backed by consumer loans [Member] | Various Issuer [Member] | Consumer [Member] | Europe [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 3,305,000	[3],[4],[11]	$ 3,449,000	[7],[8],[12]
Rate		0.00%	[3],[4],[11]	0.00%	[7],[8],[12]
Fair Value		$ 2,957,000	[3],[4],[11]	$ 3,049,000	[7],[8],[12]
Consumer loans and asset-backed securities backed by consumer loans [Member] | Various Issuer [Member] | Minimum [Member] | Consumer [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2017-04	[3],[4],[11],[13],[14],[15]	2017-01	[7],[8],[12],[16],[17],[18]
Rate		5.31%	[3],[4],[11],[13],[14],[15]	5.31%	[7],[8],[12],[16],[17],[18]
Consumer loans and asset-backed securities backed by consumer loans [Member] | Various Issuer [Member] | Minimum [Member] | Consumer [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date		2024-08	[3],[4],[11]	2024-08	[7],[8],[12]
Consumer loans and asset-backed securities backed by consumer loans [Member] | Various Issuer [Member] | Maximum [Member] | Consumer [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2022-07	[3],[4],[11],[13],[14],[15]	2021-12	[7],[8],[12],[16],[17],[18]
Rate		60.28%	[3],[4],[11],[13],[14],[15]	60.28%	[7],[8],[12],[16],[17],[18]
Consumer loans and asset-backed securities backed by consumer loans [Member] | Various Issuer [Member] | Maximum [Member] | Consumer [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date		2030-12	[3],[4],[11]	2026-03	[7],[8],[12]
Corporate Debt [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		23.66%	[2],[3],[4]	12.42%	[6],[7],[8]
Fair Value		$ 154,819,000	[3],[4]	$ 80,095,000	[7],[8]
Investment Owned, at Cost		$ 155,130,000	[3],[4]	$ 81,036,000	[7],[8]
Corporate Debt [Member] | North America [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		22.64%	[2],[3],[4]	12.13%	[6],[7],[8]
Fair Value		$ 148,146,000	[3],[4]	$ 78,187,000	[7],[8]
Investment Owned, at Cost		$ 147,832,000	[3],[4]	$ 78,482,000	[7],[8]
Corporate Debt [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		1.02%	[2],[3],[4]	0.29%	[6],[7],[8]
Fair Value		$ 6,673,000	[3],[4]	$ 1,908,000	[7],[8]
Investment Owned, at Cost		7,298,000	[3],[4]	2,554,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Communications [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		16,294,000	[3],[4]	9,381,000
Fair Value		$ 16,230,000	[3],[4]	9,489,000
Corporate Debt [Member] | Various Issuer [Member] | Communications [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2021-08
Current Principal/Notional Amount	[3],[4]	$ 2,194,000
Rate	[3],[4]	6.90%
Fair Value	[3],[4]	$ 1,972,000
Corporate Debt [Member] | Various Issuer [Member] | Consumer [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		68,855,000	[3],[4]	22,991,000	[7],[8]
Fair Value		68,535,000	[3],[4]	24,187,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Consumer [Member] | Europe [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 17,947,000	[3],[4]	$ 17,618,000	[7],[8]
Rate		0.00%	[3],[4]	0.00%	[7],[8]
Fair Value		$ 328,000	[3],[4]	$ 380,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Energy [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		35,584,000	[3],[4]	16,170,000	[7],[8]
Fair Value		35,633,000	[3],[4]	16,951,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Basic Materials [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[3],[4]	6,130,000
Fair Value	[3],[4]	6,108,000
Corporate Debt [Member] | Various Issuer [Member] | Industrial Sector [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		11,475,000	[3],[4]	12,470,000	[7],[8]
Fair Value		11,326,000	[3],[4]	$ 12,709,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Industrial Sector [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date	[7],[8]			2021-03
Current Principal/Notional Amount		4,918,000	[3],[4]	$ 1,867,000	[7],[8]
Rate	[7],[8]			6.50%
Fair Value		$ 4,373,000	[3],[4]	$ 1,528,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2019-10	[3],[4]	2019-10	[7],[8]
Current Principal/Notional Amount		$ 6,320,000	[3],[4]	$ 10,500,000	[7],[8]
Rate		15.00%	[3],[4]	15.00%	[7],[8]
Fair Value		$ 6,320,000	[3],[4]	$ 9,975,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Technology Sector [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		3,288,000	[3],[4]	3,827,000	[7],[8]
Fair Value		$ 3,322,000	[3],[4]	$ 3,937,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Utilities [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2020-12	[3],[4]	2021-07	[7],[8]
Current Principal/Notional Amount		$ 683,000	[3],[4]	$ 840,000	[7],[8]
Rate		6.90%	[3],[4]	7.38%	[7],[8]
Fair Value		$ 672,000	[3],[4]	$ 939,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | Communications [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2018-05	[3],[4]	2018-04	[7],[8]
Rate		5.63%	[3],[4]	6.75%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | Consumer [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2017-05	[3],[4]	2017-05	[7],[8]
Rate		2.60%	[3],[4]	3.85%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | Consumer [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date		2017-12	[3],[4]	2017-12	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | Energy [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2019-03	[3],[4]	2019-03	[7],[8]
Rate		0.00%	[3],[4]	6.38%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | Basic Materials [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2020-03
Rate	[3],[4]	3.10%
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | Industrial Sector [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2019-04	[3],[4]	2019-05	[7],[8]
Rate		3.75%	[3],[4]	3.75%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | Industrial Sector [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2018-05
Rate	[3],[4]	4.00%
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | Technology Sector [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2019-09	[3],[4]	2020-03	[7],[8]
Rate		4.99%	[3],[4]	6.13%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | Communications [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2025-09	[3],[4]	2022-12	[7],[8]
Rate		11.00%	[3],[4]	9.07%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | Consumer [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2034-12	[3],[4]	2025-05	[7],[8]
Rate		11.00%	[3],[4]	11.00%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | Consumer [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date		2018-12	[3],[4]	2018-12	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | Energy [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2036-10	[3],[4]	2023-02	[7],[8]
Rate		9.63%	[3],[4]	9.63%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | Basic Materials [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2027-03
Rate	[3],[4]	7.38%
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | Industrial Sector [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2022-11	[3],[4]	2022-12	[7],[8]
Rate		7.75%	[3],[4]	7.75%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | Industrial Sector [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2021-03
Rate	[3],[4]	6.54%
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | Technology Sector [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2023-12	[3],[4]	2022-08	[7],[8]
Rate		7.50%	[3],[4]	7.50%	[7],[8]
Mortgage Loans [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		26.76%	[2],[3],[4],[11]	22.55%	[6],[7],[8],[12]
Fair Value		$ 175,158,000	[3],[4],[11]	$ 145,419,000	[7],[8],[12]
Investment Owned, at Cost		176,302,000	[3],[4],[11]	148,173,000	[7],[8],[12]
Mortgage Loans [Member] | Various Issuer [Member] | Mortgage-related Commercial [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		64,558,000	[3],[4],[11],[19]	71,020,000	[7],[8],[12],[20]
Fair Value		62,508,000	[3],[4],[11],[19]	61,129,000	[7],[8],[12],[20]
Mortgage Loans [Member] | Various Issuer [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		118,296,000	[3],[4],[11],[21]	89,658,000	[7],[8],[12],[22]
Fair Value		$ 112,650,000	[3],[4],[11],[21]	$ 84,290,000	[7],[8],[12],[22]
Mortgage Loans [Member] | Various Issuer [Member] | Minimum [Member] | Mortgage-related Commercial [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2017-06	[3],[4],[11],[19]	2017-06	[7],[8],[12],[20]
Rate		2.87%	[3],[4],[11],[19]	2.73%	[7],[8],[12],[20]
Mortgage Loans [Member] | Various Issuer [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2022-04	[3],[4],[11],[21]	2022-04	[7],[8],[12],[22]
Rate		2.00%	[3],[4],[11],[21]	2.00%	[7],[8],[12],[22]
Mortgage Loans [Member] | Various Issuer [Member] | Maximum [Member] | Mortgage-related Commercial [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2037-10	[3],[4],[11],[19]	2037-10	[7],[8],[12],[20]
Rate		12.29%	[3],[4],[11],[19]	12.12%	[7],[8],[12],[20]
Mortgage Loans [Member] | Various Issuer [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2057-07	[3],[4],[11],[21]	2057-07	[7],[8],[12],[22]
Rate		12.63%	[3],[4],[11],[21]	12.63%	[7],[8],[12],[22]
Real Estate Owned [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		3.88%	[2],[3],[4],[11],[23]	0.52%	[6],[7],[8],[12],[24]
Fair Value		$ 25,390,000	[3],[4],[11],[23]	$ 3,349,000	[7],[8],[12],[24]
Investment Owned, at Cost		25,475,000	[3],[4],[11],[23]	3,539,000	[7],[8],[12],[24]
Real Estate Owned [Member] | Single-Family Houses [Member] | Real estate-related [Member] | North America [Member]
Schedule of Investments [Line Items]
Fair Value		$ 1,220,000	[3],[4],[11],[23]	$ 1,699,000	[7],[8],[12],[24]
Number of Real Estate Properties		7	[3],[4],[11],[23]	9	[7],[8],[12],[24]
Real Estate Owned [Member] | Commercial Property [Member] | Real estate-related [Member] | North America [Member]
Schedule of Investments [Line Items]
Fair Value	[7],[8],[12],[24]			$ 1,650,000
Number of Real Estate Properties		10	[3],[4],[11],[23]	1	[7],[8],[12],[24]
Real Estate Owned [Member] | Commercial Properties [Member] | Real estate-related [Member] | North America [Member]
Schedule of Investments [Line Items]
Fair Value	[3],[4],[11],[23]	$ 24,170,000
Corporate Equity Investments [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		4.63%	[2],[3],[4]	4.11%	[6],[7],[8]
Fair Value		$ 30,318,000	[3],[4]	$ 26,473,000	[7],[8]
Investment Owned, at Cost		$ 29,282,000	[3],[4]	$ 25,937,000	[7],[8]
Corporate Equity Investments [Member] | North America [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		4.63%	[2],[3],[4]	4.11%	[6],[7],[8]
Fair Value		$ 30,318,000	[3],[4]	$ 26,473,000	[7],[8]
Investment Owned, at Cost		$ 29,282,000	[3],[4]	$ 25,937,000	[7],[8]
Corporate Equity Investments [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		0.00%	[2],[3],[4]	0.00%	[6],[7],[8]
Fair Value		$ 0	[3],[4]	$ 0	[7],[8]
Investment Owned, at Cost		0	[3],[4]	0	[7],[8]
Corporate Equity Investments [Member] | Non-Exchange Traded Corporate Equity [Member] | Consumer [Member] | North America [Member]
Schedule of Investments [Line Items]
Fair Value		$ 890,000	[3],[4]	$ 825,000	[7],[8]
Investment Owned, Balance, Shares		1,557	[3],[4]	1,557	[7],[8]
Corporate Equity Investments [Member] | Non-Exchange Traded Corporate Equity [Member] | Consumer [Member] | Europe [Member]
Schedule of Investments [Line Items]
Fair Value		$ 0	[3],[4]	$ 0	[7],[8]
Investment Owned, Balance, Shares		125	[3],[4]	125	[7],[8]
Corporate Equity Investments [Member] | Non-Exchange Traded Corporate Equity [Member] | Diversified [Member] | North America [Member]
Schedule of Investments [Line Items]
Fair Value		$ 3,492,000	[3],[4]	$ 3,162,000	[7],[8]
Investment Owned, Balance, Shares		191	[3],[4]	191	[7],[8]
Corporate Equity Investments [Member] | Exchange Traded Equity [Member] | Financial [Member] | North America [Member]
Schedule of Investments [Line Items]
Fair Value		$ 2,837,000	[3],[4]	$ 4,396,000	[7],[8]
Investment Owned, Balance, Shares		32	[3],[4]	51	[7],[8]
Corporate Equity Investments [Member] | Non-controlling Interest in Mortgage-related Private Partnership [Member] | Mortgage-related Commercial [Member] | North America [Member]
Schedule of Investments [Line Items]
Fair Value		$ 3,099,000	[3],[4]	$ 3,090,000	[7],[8]
Corporate Equity Investments [Member] | Non-Exchange Traded Preferred Equity Investment in Mortgage Originators [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Fair Value		$ 19,325,000	[3],[4]	$ 14,325,000	[7],[8]
Investment Owned, Balance, Shares		1,843	[3],[4]	1,838	[7],[8]
Corporate Equity Investments [Member] | Non-Exchange Traded Equity Investment in Mortgage Originator | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Fair Value		$ 675,000	[3],[4]	$ 675,000	[7],[8]
Investment Owned, Balance, Shares		6,750	[3],[4]	6,750	[7],[8]
US Treasury Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		5.58%	[2],[3],[4]	0.84%	[6],[7],[8]
Fair Value		$ 36,488,000	[3],[4]	$ 5,419,000	[7],[8]
Investment Owned, at Cost		36,455,000	[3],[4]	5,635,000	[7],[8]
US Treasury Securities [Member] | US Treasury Notes Securities [Member] | Government [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		36,529,000	[3],[4]	5,620,000	[7],[8]
Fair Value		$ 36,488,000	[3],[4]	$ 5,419,000	[7],[8]
US Treasury Securities [Member] | US Treasury Notes Securities [Member] | Minimum [Member] | Government [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2021-04	[3],[4]	2021-05	[7],[8]
Rate		1.13%	[3],[4]	1.13%	[7],[8]
US Treasury Securities [Member] | US Treasury Notes Securities [Member] | Maximum [Member] | Government [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2026-05	[3],[4]	2026-05	[7],[8]
Rate		2.00%	[3],[4]	1.63%	[7],[8]
Long Investments [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		284.85%	[2],[3],[4]	233.42%	[6],[7],[8]
Fair Value		$ 1,864,213,000	[3],[4]	$ 1,505,026,000	[7],[8]
Investment Owned, at Cost		$ 1,876,105,000	[3],[4]	$ 1,525,710,000	[7],[8]
Long Investments [Member] | Government National Mortgage Association [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		23.06%		23.36%
Long Investments [Member] | Federal National Mortgage Association [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		103.29%		73.78%
Long Investments [Member] | Federal Home Loan Mortgage Corporation [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		40.88%		42.13%
Related Party 1 [Member]
Schedule of Investments [Line Items]
Fair value of loans held in related party trust		$ 7,400,000		$ 7,600,000
Related Party 2 [Member]
Schedule of Investments [Line Items]
Fair value of loans held in related party trust		86,700,000		43,200,000
Related Party 3 [Member]
Schedule of Investments [Line Items]
Fair value of loans held in related party trust		$ 6,400,000		$ 7,300,000

[1] At March 31, 2017, the Company's long investments guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, and the Government National Mortgage Association, represented 103.29%, 40.88%, and 23.06% of equity, respectively.

[2] Classification percentages are based on Total Equity.

[3] See Note 2 and Note 3 in Notes to Consolidated Financial Statements.

[4] The table below shows the ratings on the Company's long investments from Moody's, Standard and Poor's, or Fitch, as well as the Company's long investments that were unrated but guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, or the Government National Mortgage Association. Ratings tend to be a lagging credit indicator; as a result, the credit quality of the Company's long investment holdings may be lower than the credit quality implied based on the ratings listed below. In situations where an investment has a split rating, the lowest provided rating is used. The ratings descriptions include ratings qualified with a "+," "-," "1," "2," or "3."Rating Description Percent of EquityUnrated but Agency-Guaranteed 167.23%A/A/A 0.05%Aaa/AAA/AAA 5.57%Baa/BBB/BBB 3.76%Ba/BB/BB or below 39.76%Unrated 68.48%

[5] At December 31, 2016, the Company's long investments guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, and the Government National Mortgage Association, represented 73.78%, 42.13%, and 23.36% of equity, respectively.

[6] Classification percentages are based on Total Equity.

[7] See Note 2 and Note 3 in Notes to Consolidated Financial Statements.

[8] The table below shows the Company's long investment ratings from Moody's, Standard and Poor's, or Fitch, as well as the Company's long investments that were unrated but guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, or the Government National Mortgage Association. Ratings tend to be a lagging credit indicator; as a result, the credit quality of the Company's long investment holdings may be lower than the credit quality implied based on the ratings listed below. In situations where an investment has a split rating, the lowest provided rating is used. The ratings descriptions include ratings qualified with a "+," "-," "1," "2," or "3."Rating Description Percent of EquityUnrated but Agency-Guaranteed 139.27%Aaa/AAA/AAA 0.84%Aa/AA/AA 0.03%A/A/A 0.05%Baa/BBB/BBB 2.60%Ba/BB/BB or below 30.24%Unrated 60.39%

[9] Private trust 100% backed by interest in Government National Mortgage Association collateralized mortgage obligation certificates.

[10] Private trust 100% backed by interest in Government National Mortgage Association collateralized mortgage obligation certificates.

[11] Loans and real estate owned are beneficially owned by the Company through participation certificates in the various trusts that hold such investments. See Note 7 to the Notes to the Consolidated Financial Statements.

[12] Loans and real estate owned are beneficially owned by the Company through participation certificates in the various trusts that hold such investments. See Note 7 to the Notes to Consolidated Financial Statements.

[13] Includes investments in participation certificates related to loans held in a trust owned by a related party of Ellington Management Group, L.L.C. Through its participation certificates, the Company participates in the cash flows of the underlying loans held by the trust. At March 31, 2017 loans held in the related party trust for which the Company has participating interests in the cash flows, totaled $86.7 million. See Note 7 to the Notes to Consolidated Financial Statements.

[14] Includes investments in participation certificates related to loans titled in the name of a related party of Ellington Financial Management LLC. Through its participation certificates, the Company has beneficial interests in the loan cash flows, net of servicing-related fees and expenses. At March 31, 2017 loans for which the Company has beneficial interests in the net cash flows, totaled $7.4 million. See Note 7 to the Notes to the Consolidated Financial Statements.

[15] Includes the Company's beneficial interest in an entity, which is co-owned by an affiliate of Ellington Management Group, L.L.C., in the amount of $6.4 million as of March 31, 2017. The entity owns subordinated notes issued by, as well as trust certificates representing ownership of, a securitization trust. See Note 7 to the Notes to Consolidated Financial Statements.

[16] Includes investments in participation certificates related to loans held in a trust owned by a related party of Ellington Management Group, L.L.C. Through its participation certificates, the Company participates in the cash flows of the underlying loans held by the trust. At December 31, 2016 loans held in the related party trust for which the Company has participating interests in the cash flows, totaled $43.2 million. See Note 7 to the Notes to Consolidated Financial Statements.

[17] Includes investments in participation certificates related to loans titled in the name of a related party of Ellington Management Group L.L.C. Through its participation certificates, the Company has beneficial interests in the loan cash flows, net of servicing-related fees and expenses. At December 31, 2016 loans for which the Company has beneficial interests in the net cash flows, totaled $7.6 million. See Note 7 to the Notes to Consolidated Financial Statements.

[18] Includes the Company's beneficial interest in an entity, which is co-owned by an affiliate of Ellington Management Group, L.L.C., in the amount of $7.3 million as of December 31, 2016. The entity owns subordinated notes issued by, as well as trust certificates representing ownership of, a securitization trust. See Note 7 to the Notes to Consolidated Financial Statements.

[19] Includes non-performing commercial loans in the amount of $6.5 million whereby principal and/or interest is past due and a maturity date is not applicable.

[20] Includes non-performing commercial loans in the amount of $28.6 million whereby principal and/or interest is past due and a maturity date is not applicable.

[21] As of March 31, 2017, the Company had residential mortgage loans that were in the process of foreclosure with a fair value of $5.6 million.

[22] As of December 31, 2016, the Company had residential mortgage loans that were in the process of foreclosure with a fair value of $3.2 million.

[23] Number of properties not shown in thousands, represents actual number of properties owned.

[24] Number of properties not shown in thousands, represents actual number of properties owned.