Consolidated Condensed Schedule Of Investments (Long Investments) - USD ($) shares in Thousands		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015
Schedule of Investments [Line Items]
Fair Value		$ 1,505,026,000		$ 1,661,118,000
Investment Owned, at Cost		$ 1,525,710,000		$ 1,672,400,000
Percentage collaterallized by GNRCMO certificates		100.00%		100.00%
Non-performing loans, maturity date not applicable		$ 28,600,000		$ 22,600,000
Mortgage Loans in Process of Foreclosure, Amount		$ 3,200,000		$ 5,900,000
Unrated But Agency-Guaranteed [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity		139.27%		143.52%
Long Investment Aaa Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity		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%		0.32%
Long Investment BBB Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity		2.60%		1.07%
Long Investment BB Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity		30.24%		34.89%
Long Investment Unrated Rating [Member]
Schedule of Investments [Line Items]
Long investment holdings as a percentage of stockholders' equity		60.39%		44.99%
Principal And Interest - Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		121.61%	[1],[2],[3],[4]	124.31%	[5],[6],[7],[8]
Fair Value		$ 784,132,000	[1],[3],[4]	$ 918,562,000	[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		$ 147,479,000	[1],[3],[4]	$ 128,637,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 156,144,000	[1],[3],[4]	$ 136,894,000	[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]	2042-08	[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		2047-01	[1],[3],[4]	2045-10	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 4.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 121,756,000	[1],[3],[4]	$ 160,391,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 128,798,000	[1],[3],[4]	$ 170,500,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 4.00% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2043-08	[1],[3],[4]	2042-09	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation Pools (30 Year) 4.00% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2047-01	[1],[3],[4]	2045-08	[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		$ 67,681,000	[1],[3],[4]	$ 110,746,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Fair Value		$ 73,305,000	[1],[3],[4]	$ 120,785,000	[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]	2045-10	[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		$ 58,682,000	[1],[3],[4]	$ 72,425,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Fair Value		$ 60,451,000	[1],[3],[4]	$ 74,959,000	[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		2043-03	[1],[3],[4]	2042-10	[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]	2045-10	[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		$ 51,402,000	[1],[3],[4]	$ 45,792,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Fair Value		$ 54,019,000	[1],[3],[4]	$ 48,211,000	[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		2031-11	[1],[3],[4]	2030-10	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 5.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 44,796,000	[1],[3],[4]	$ 54,658,000	[5],[7],[8]
Rate		5.00%	[1],[3],[4]	5.00%	[5],[7],[8]
Fair Value		$ 49,062,000	[1],[3],[4]	$ 60,473,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 5.00% [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 (30 Year) 5.00% [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		$ 40,722,000	[1],[3],[4]	$ 42,655,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Fair Value		$ 44,010,000	[1],[3],[4]	$ 46,365,000	[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		2046-09	[1],[3],[4]	2045-10	[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		$ 25,244,000	[1],[3],[4]	$ 29,417,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Fair Value		$ 25,993,000	[1],[3],[4]	$ 30,458,000	[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		2047-01	[1],[3],[4]	2045-10	[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		$ 21,855,000	[1],[3],[4]	$ 31,481,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 23,346,000	[1],[3],[4]	$ 33,620,000	[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		2046-12	[1],[3],[4]	2045-10	[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		$ 22,073,000	[1],[3],[4]	$ 13,060,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Fair Value		$ 22,730,000	[1],[3],[4]	$ 13,500,000	[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]	2030-10	[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	[1],[3],[4]	$ 10,504,000
Rate	[1],[3],[4]	4.60%
Fair Value	[1],[3],[4]	$ 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	[1],[3],[4]	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	[1],[3],[4]	2064-11
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		$ 9,968,000	[1],[3],[4]	$ 11,558,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 10,596,000	[1],[3],[4]	$ 12,284,000	[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]	2029-12	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.56% [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]			$ 8,154,000
Rate	[5],[7],[8]			4.56%
Fair Value	[5],[7],[8]			$ 8,850,000
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		$ 10,120,000	[1],[3],[4]	$ 8,221,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Fair Value		$ 10,379,000	[1],[3],[4]	$ 8,508,000	[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]	2043-06	[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		$ 9,219,000	[1],[3],[4]	$ 21,705,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Fair Value		$ 9,686,000	[1],[3],[4]	$ 22,848,000	[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		2030-09	[1],[3],[4]	2030-09	[5],[7],[8]
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		$ 6,714,000	[1],[3],[4]	$ 7,799,000	[5],[7],[8]
Rate		5.00%	[1],[3],[4]	5.00%	[5],[7],[8]
Fair Value		$ 7,408,000	[1],[3],[4]	$ 8,680,000	[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) 4.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 6,568,000	[1],[3],[4]	$ 15,056,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Fair Value		$ 7,099,000	[1],[3],[4]	$ 16,328,000	[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		2046-09	[1],[3],[4]	2045-09	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.68% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 6,200,000	[1],[3],[4]	$ 6,705,000	[5],[7],[8]
Rate		4.68%	[1],[3],[4]	4.68%	[5],[7],[8]
Fair Value		$ 6,703,000	[1],[3],[4]	$ 7,280,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.68% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2063-11	[1],[3],[4]	2063-11	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.68% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2064-09	[1],[3],[4]	2064-09	[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]
Investments maturity date	[5],[7],[8]			2045-04
Current Principal/Notional Amount		$ 6,231,000	[1],[3],[4]	$ 3,402,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Fair Value		$ 6,513,000	[1],[3],[4]	$ 3,551,000	[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	[1],[3],[4]	2046-02
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	[1],[3],[4]	2046-12
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	[1],[3],[4]	2065-01
Current Principal/Notional Amount	[1],[3],[4]	$ 5,219,000
Rate	[1],[3],[4]	4.55%
Fair Value	[1],[3],[4]	$ 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	[1],[3],[4]	2066-11
Current Principal/Notional Amount	[1],[3],[4]	$ 4,942,000
Rate	[1],[3],[4]	4.44%
Fair Value	[1],[3],[4]	$ 5,383,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.61% Percent [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[1],[3],[4]	2064-11
Current Principal/Notional Amount		$ 3,892,000	[1],[3],[4]	$ 6,196,000	[5],[7],[8]
Rate		4.61%	[1],[3],[4]	4.61%	[5],[7],[8]
Fair Value		$ 4,216,000	[1],[3],[4]	$ 6,734,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.61% Percent [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2064-06
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.61% Percent [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 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		$ 3,619,000	[1],[3],[4]	$ 4,564,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Fair Value		$ 3,905,000	[1],[3],[4]	$ 4,914,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.50% [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]			$ 3,764,000
Rate	[5],[7],[8]			4.50%
Fair Value	[5],[7],[8]			$ 4,057,000
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	[1],[3],[4]	2061-07
Current Principal/Notional Amount	[1],[3],[4]	$ 3,518,000
Rate	[1],[3],[4]	4.42%
Fair Value	[1],[3],[4]	$ 3,741,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.75% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2061-01
Current Principal/Notional Amount	[5],[7],[8]			$ 3,748,000
Rate	[5],[7],[8]			4.75%
Fair Value	[5],[7],[8]			$ 3,877,000
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	[1],[3],[4]	2046-10
Current Principal/Notional Amount	[1],[3],[4]	$ 3,513,000
Rate	[1],[3],[4]	2.50%
Fair Value	[1],[3],[4]	$ 3,414,000
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	[1],[3],[4]	2064-11
Current Principal/Notional Amount	[1],[3],[4]	$ 3,123,000
Rate	[1],[3],[4]	4.48%
Fair Value	[1],[3],[4]	$ 3,361,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.80% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2061-02
Current Principal/Notional Amount	[5],[7],[8]			$ 3,376,000
Rate	[5],[7],[8]			4.80%
Fair Value	[5],[7],[8]			$ 3,504,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.49% [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]			$ 3,129,000
Rate	[5],[7],[8]			4.49%
Fair Value	[5],[7],[8]			$ 3,376,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.62% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2064-10	[1],[3],[4]	2063-12	[5],[7],[8]
Current Principal/Notional Amount		$ 3,043,000	[1],[3],[4]	$ 4,888,000	[5],[7],[8]
Rate		4.62%	[1],[3],[4]	4.62%	[5],[7],[8]
Fair Value		$ 3,303,000	[1],[3],[4]	$ 5,285,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.59% [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]			$ 6,041,000
Rate	[5],[7],[8]			4.59%
Fair Value	[5],[7],[8]			$ 6,565,000
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		$ 2,896,000	[1],[3],[4]	$ 4,713,000	[5],[7],[8]
Rate		5.50%	[1],[3],[4]	5.50%	[5],[7],[8]
Fair Value		$ 3,216,000	[1],[3],[4]	$ 5,248,000	[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	[1],[3],[4]	2065-01
Current Principal/Notional Amount	[1],[3],[4]	$ 2,945,000
Rate	[1],[3],[4]	4.57%
Fair Value	[1],[3],[4]	$ 3,186,000
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	[1],[3],[4]	2030-04
Current Principal/Notional Amount		$ 3,030,000	[1],[3],[4]	$ 5,859,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Fair Value		$ 3,119,000	[1],[3],[4]	$ 6,054,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Corporation Pools (15 Year) 3.00% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2028-03
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal Home Loan Corporation Pools (15 Year) 3.00% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2030-04
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]
Investments maturity date	[5],[7],[8]			2028-06
Current Principal/Notional Amount		$ 3,030,000	[1],[3],[4]	$ 2,788,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Fair Value		$ 3,109,000	[1],[3],[4]	$ 2,880,000	[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	[1],[3],[4]	2028-06
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	[1],[3],[4]	2030-03
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		$ 2,726,000	[1],[3],[4]	$ 2,780,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Fair Value		$ 2,968,000	[1],[3],[4]	$ 3,031,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.64% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2065-03	[1],[3],[4]	2065-03	[5],[7],[8]
Current Principal/Notional Amount		$ 2,459,000	[1],[3],[4]	$ 2,680,000	[5],[7],[8]
Rate		4.64%	[1],[3],[4]	4.64%	[5],[7],[8]
Fair Value		$ 2,672,000	[1],[3],[4]	$ 2,924,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 5.49% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2060-04	[1],[3],[4]	2060-04	[5],[7],[8]
Current Principal/Notional Amount		$ 2,433,000	[1],[3],[4]	$ 2,966,000	[5],[7],[8]
Rate		5.49%	[1],[3],[4]	5.49%	[5],[7],[8]
Fair Value		$ 2,551,000	[1],[3],[4]	$ 3,151,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 5.54% [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]			$ 2,469,000
Rate	[5],[7],[8]			5.54%
Fair Value	[5],[7],[8]			$ 2,598,000
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 3.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		$ 2,195,000	[1],[3],[4]	$ 6,256,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Fair Value		$ 2,193,000	[1],[3],[4]	$ 6,266,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 3.00% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2042-01	[1],[3],[4]	2043-01	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (30 Year) 3.00% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2045-06	[1],[3],[4]	2043-02	[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	[1],[3],[4]	2033-12
Current Principal/Notional Amount		$ 2,043,000	[1],[3],[4]	$ 6,114,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 2,172,000	[1],[3],[4]	$ 6,558,000	[5],[7],[8]
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (20 Year) 4.00% [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2033-11
Principal And Interest - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association Pools (20 Year) 4.00% [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2033-12
Principal And Interest - Fixed Rate Agency Securities [Member] | Government National Mortgage Association Pools (Other) 4.63% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2064-06	[1],[3],[4]	2064-10	[5],[7],[8]
Current Principal/Notional Amount		$ 1,943,000	[1],[3],[4]	$ 3,406,000	[5],[7],[8]
Rate		4.63%	[1],[3],[4]	4.63%	[5],[7],[8]
Fair Value		$ 2,103,000	[1],[3],[4]	$ 3,704,000	[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		$ 1,793,000	[1],[3],[4]	$ 2,533,000	[5],[7],[8]
Rate		6.00%	[1],[3],[4]	6.00%	[5],[7],[8]
Fair Value		$ 2,049,000	[1],[3],[4]	$ 2,866,000	[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) 5.51% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2060-02	[1],[3],[4]	2060-02	[5],[7],[8]
Current Principal/Notional Amount		$ 1,916,000	[1],[3],[4]	$ 2,326,000	[5],[7],[8]
Rate		5.51%	[1],[3],[4]	5.51%	[5],[7],[8]
Fair Value		$ 2,016,000	[1],[3],[4]	$ 2,479,000	[5],[7],[8]
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		$ 1,734,000	[1],[3],[4]	$ 1,988,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 1,842,000	[1],[3],[4]	$ 2,121,000	[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	[1],[3],[4]	2060-02
Current Principal/Notional Amount	[1],[3],[4]	$ 1,675,000
Rate	[1],[3],[4]	5.57%
Fair Value	[1],[3],[4]	$ 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],[3],[4]	$ 1,689,000
Rate	[1],[3],[4]	3.00%
Fair Value	[1],[3],[4]	$ 1,694,000
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	[1],[3],[4]	2030-05
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	[1],[3],[4]	2030-06
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		$ 1,369,000	[1],[3],[4]	$ 1,608,000	[5],[7],[8]
Rate		6.00%	[1],[3],[4]	6.00%	[5],[7],[8]
Fair Value		$ 1,553,000	[1],[3],[4]	$ 1,807,000	[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 (30 Year) 3.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2043-07
Current Principal/Notional Amount		$ 1,523,000	[1],[3],[4]	$ 1,139,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Fair Value		$ 1,518,000	[1],[3],[4]	$ 1,140,000	[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	[1],[3],[4]	2043-07
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	[1],[3],[4]	2045-10
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	[1],[3],[4]	2043-06
Current Principal/Notional Amount	[1],[3],[4]	$ 1,275,000
Rate	[1],[3],[4]	3.00%
Fair Value	[1],[3],[4]	$ 1,258,000
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	[1],[3],[4]	2033-12	[5],[7],[8]
Current Principal/Notional Amount		$ 1,156,000	[1],[3],[4]	$ 1,352,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Fair Value		$ 1,254,000	[1],[3],[4]	$ 1,471,000	[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		$ 496,000	[1],[3],[4]	$ 689,000	[5],[7],[8]
Rate		5.50%	[1],[3],[4]	5.50%	[5],[7],[8]
Fair Value		$ 551,000	[1],[3],[4]	$ 764,000	[5],[7],[8]
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		$ 498,000	[1],[3],[4]	$ 879,000	[5],[7],[8]
Rate		5.00%	[1],[3],[4]	5.00%	[5],[7],[8]
Fair Value		$ 543,000	[1],[3],[4]	$ 964,000	[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	[1],[3],[4]	2030-10
Current Principal/Notional Amount	[1],[3],[4]	$ 165,000
Rate	[1],[3],[4]	3.50%
Fair Value	[1],[3],[4]	$ 168,000
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		$ 75,000	[1],[3],[4]	$ 126,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 77,000	[1],[3],[4]	$ 130,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		1.89%	[1],[2],[3],[4]	1.00%	[5],[6],[7],[8]
Fair Value		$ 12,189,000	[1],[3],[4]	$ 7,403,000	[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	[1],[3],[4]	$ 26,883,000
Rate	[1],[3],[4]	4.00%
Fair Value	[1],[3],[4]	$ 4,547,000
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	[1],[3],[4]	2045-02
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	[1],[3],[4]	2045-06
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		$ 9,820,000	[1],[3],[4]	$ 8,889,000	[5],[7],[8]
Rate		4.50%	[1],[3],[4]	4.50%	[5],[7],[8]
Fair Value		$ 1,414,000	[1],[3],[4]	$ 963,000	[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]	2043-05	[5],[7],[8]
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		$ 6,303,000	[1],[3],[4]	$ 8,681,000	[5],[7],[8]
Rate		5.50%	[1],[3],[4]	5.50%	[5],[7],[8]
Fair Value		$ 1,137,000	[1],[3],[4]	$ 1,603,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation 3.50% [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		$ 5,099,000	[1],[3],[4]	$ 5,977,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Fair Value		$ 808,000	[1],[3],[4]	$ 869,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation 5.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2040-03
Current Principal/Notional Amount	[5],[7],[8]			$ 4,884,000
Rate	[5],[7],[8]			5.00%
Fair Value	[5],[7],[8]			$ 519,000
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		$ 6,695,000	[1],[3],[4]	$ 11,249,000	[5],[7],[8]
Rate		5.00%	[1],[3],[4]	5.00%	[5],[7],[8]
Fair Value		$ 806,000	[1],[3],[4]	$ 1,425,000	[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]	2036-01	[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]
Investments maturity date	[5],[7],[8]			2039-05
Current Principal/Notional Amount		$ 5,354,000	[1],[3],[4]	$ 1,346,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 648,000	[1],[3],[4]	$ 219,000	[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	[1],[3],[4]	2039-05
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	[1],[3],[4]	2043-11
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	[1],[3],[4]	2041-02
Current Principal/Notional Amount	[1],[3],[4]	$ 3,844,000
Rate	[1],[3],[4]	4.50%
Fair Value	[1],[3],[4]	$ 615,000
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	[1],[3],[4]	2040-01
Current Principal/Notional Amount	[1],[3],[4]	$ 2,661,000
Rate	[1],[3],[4]	6.00%
Fair Value	[1],[3],[4]	$ 512,000
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	[1],[3],[4]	2040-06
Current Principal/Notional Amount	[1],[3],[4]	$ 81,664,000
Rate	[1],[3],[4]	0.26%
Fair Value	[1],[3],[4]	$ 472,000
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association 3.00% [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		$ 3,167,000	[1],[3],[4]	$ 3,909,000	[5],[7],[8]
Rate		3.00%	[1],[3],[4]	3.00%	[5],[7],[8]
Fair Value		$ 321,000	[1],[3],[4]	$ 421,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association 6.00% [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		$ 1,123,000	[1],[3],[4]	$ 1,544,000	[5],[7],[8]
Rate		6.00%	[1],[3],[4]	6.00%	[5],[7],[8]
Fair Value		$ 263,000	[1],[3],[4]	$ 330,000	[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		$ 1,396,000	[1],[3],[4]	$ 2,019,000	[5],[7],[8]
Rate		4.75%	[1],[3],[4]	4.75%	[5],[7],[8]
Fair Value		$ 253,000	[1],[3],[4]	$ 378,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association 5.50% [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		$ 1,201,000	[1],[3],[4]	$ 1,651,000	[5],[7],[8]
Rate		5.50%	[1],[3],[4]	5.50%	[5],[7],[8]
Fair Value		$ 163,000	[1],[3],[4]	$ 239,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Government National Mortgage Association 5.00% [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		$ 2,289,000	[1],[3],[4]	$ 3,782,000	[5],[7],[8]
Rate		5.00%	[1],[3],[4]	5.00%	[5],[7],[8]
Fair Value		$ 151,000	[1],[3],[4]	$ 311,000	[5],[7],[8]
Interest Only - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation 5.50% [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		$ 763,000	[1],[3],[4]	$ 1,109,000	[5],[7],[8]
Rate		5.50%	[1],[3],[4]	5.50%	[5],[7],[8]
Fair Value		$ 79,000	[1],[3],[4]	$ 126,000	[5],[7],[8]
TBA - Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		10.94%	[1],[2],[3],[4]	13.26%	[5],[6],[7],[8]
Current Principal/Notional Amount		$ 67,720,000		$ 94,602,000
Fair Value		$ 70,525,000	[1],[3],[4]	$ 98,009,000	[5],[7],[8]
TBA - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation (30 Year) 3.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2017-01	[1],[3],[4]	2016-01	[5],[7],[8]
Current Principal/Notional Amount		$ 28,560,000	[1],[3],[4]	$ 26,600,000	[5],[7],[8]
Rate		3.50%	[1],[3],[4]	3.50%	[5],[7],[8]
Fair Value		$ 29,247,000	[1],[3],[4]	$ 27,394,000	[5],[7],[8]
TBA - Fixed Rate Agency Securities [Member] | Government National Mortgage Association (30 Year) 4.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2017-01	[1],[3],[4]	2016-01	[5],[7],[8]
Current Principal/Notional Amount		$ 24,540,000	[1],[3],[4]	$ 700,000	[5],[7],[8]
Rate		4.00%	[1],[3],[4]	4.00%	[5],[7],[8]
Fair Value		$ 26,047,000	[1],[3],[4]	$ 743,000	[5],[7],[8]
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	[1],[3],[4]	2017-01
Current Principal/Notional Amount	[1],[3],[4]	$ 14,620,000
Rate	[1],[3],[4]	3.50%
Fair Value	[1],[3],[4]	$ 15,231,000
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	[5],[7],[8]			2016-01
Current Principal/Notional Amount	[5],[7],[8]			$ 40,262,000
Rate	[5],[7],[8]			4.00%
Fair Value	[5],[7],[8]			$ 42,607,000
TBA - Fixed Rate Agency Securities [Member] | Federal Home Loan Mortgage Corporation (30 Year) 3.00% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[5],[7],[8]			2016-01
Current Principal/Notional Amount	[5],[7],[8]			$ 15,040,000
Rate	[5],[7],[8]			3.00%
Fair Value	[5],[7],[8]			$ 15,022,000
TBA - Fixed Rate Agency Securities [Member] | Federal National Mortgage Association (15 Year) 2.50% [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date				2016-01
Current Principal/Notional Amount	[5],[7],[8]			$ 9,800,000
Rate	[5],[7],[8]			2.50%
Fair Value	[5],[7],[8]			$ 9,879,000
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	[5],[7],[8]			2016-01
Current Principal/Notional Amount	[5],[7],[8]			$ 2,200,000
Rate	[5],[7],[8]			4.50%
Fair Value	[5],[7],[8]			$ 2,364,000
Fixed Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		134.44%	[1],[2],[3],[4]	138.57%	[5],[6],[7],[8]
Fair Value		$ 866,846,000	[1],[3],[4]	$ 1,023,974,000	[5],[7],[8]
Investment Owned, at Cost		$ 869,071,000	[1],[3],[4]	$ 1,023,479,000	[5],[7],[8]
Principal And Interest - Floating Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		2.12%	[1],[2],[3],[4]	2.58%	[5],[6],[7],[8]
Fair Value		$ 13,688,000	[1],[3],[4]	$ 19,091,000	[5],[7],[8]
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		5,876,000	[1],[3],[4]	9,490,000	[5],[7],[8]
Fair Value		$ 6,129,000	[1],[3],[4]	$ 9,990,000	[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		2.55%	[1],[3],[4]	2.05%	[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]	6.04%	[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		$ 5,122,000	[1],[3],[4]	$ 6,287,000	[5],[7],[8]
Fair Value		$ 5,328,000	[1],[3],[4]	$ 6,625,000	[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]	2.61%	[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		5.97%	[1],[3],[4]	5.94%	[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		2064-11	[1],[3],[4]	2064-11	[5],[7],[8]
Current Principal/Notional Amount		$ 2,097,000	[1],[3],[4]	$ 2,349,000	[5],[7],[8]
Rate		2.89%	[1],[3],[4]	2.55%	[5],[7],[8]
Fair Value		$ 2,231,000	[1],[3],[4]	$ 2,476,000	[5],[7],[8]
Interest Only - Floating Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		2.71%	[1],[2],[3],[4]	2.37%	[5],[6],[7],[8]
Fair Value		$ 17,433,000	[1],[3],[4]	$ 17,515,000	[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		228,955,000	[1],[3],[4]	203,125,000	[5],[7],[8]
Fair Value		$ 13,831,000	[1],[3],[4]	$ 12,186,000	[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]	2042-11	[5],[7],[8]
Rate		0.40%	[1],[3],[4]	0.43%	[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]	2063-10	[5],[7],[8]
Rate		6.09%	[1],[3],[4]	6.35%	[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		$ 12,928,000	[1],[3],[4]	$ 18,517,000	[5],[7],[8]
Fair Value		$ 1,867,000	[1],[3],[4]	$ 2,718,000	[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		5.39%	[1],[3],[4]	5.50%	[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		6.79%	[1],[3],[4]	7.13%	[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		$ 15,902,000	[1],[3],[4],[9]	$ 20,272,000	[5],[7],[8],[10]
Rate		3.95%	[1],[3],[4],[9]	4.31%	[5],[7],[8],[10]
Fair Value		$ 870,000	[1],[3],[4],[9]	$ 1,486,000	[5],[7],[8],[10]
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		5,182,000	[1],[3],[4]	6,446,000	[5],[7],[8]
Fair Value		$ 865,000	[1],[3],[4]	$ 1,125,000	[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		5.30%	[1],[3],[4]	5.67%	[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		5.93%	[1],[3],[4]	6.30%	[5],[7],[8]
Floating Rate Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		4.83%	[1],[2],[3],[4]	4.95%	[5],[6],[7],[8]
Fair Value		$ 31,121,000	[1],[3],[4]	$ 36,606,000	[5],[7],[8]
Investment Owned, at Cost		$ 31,069,000	[1],[3],[4]	$ 36,192,000	[5],[7],[8]
Agency Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		139.27%	[1],[2],[3],[4]	143.52%	[5],[6],[7],[8]
Fair Value		$ 897,967,000	[1],[3],[4]	$ 1,060,580,000	[5],[7],[8]
Investment Owned, at Cost		$ 900,140,000	[1],[3],[4]	$ 1,059,671,000	[5],[7],[8]
Principal And Interest - Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		28.17%	[2],[3],[4]	38.20%	[6],[7],[8]
Fair Value		$ 181,649,000	[3],[4]	$ 282,301,000	[7],[8]
Investment Owned, at Cost		$ 184,417,000	[3],[4]	$ 280,475,000	[7],[8]
Principal And Interest - Private Label Securities [Member] | North America [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		20.48%	[2],[3],[4]	32.11%	[6],[7],[8]
Fair Value		$ 132,071,000	[3],[4]	$ 237,325,000	[7],[8]
Investment Owned, at Cost		$ 125,106,000	[3],[4]	$ 229,780,000	[7],[8]
Principal And Interest - Private Label Securities [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		7.69%	[2],[3],[4]	6.09%	[6],[7],[8]
Fair Value		$ 49,578,000	[3],[4]	$ 44,976,000	[7],[8]
Investment Owned, at Cost		59,311,000	[3],[4]	50,695,000	[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		119,636,000	[3],[4]	84,045,000	[7],[8]
Fair Value		30,334,000	[3],[4]	24,456,000	[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		9,361,000	[3],[4]	7,821,000	[7],[8]
Fair Value		8,680,000	[3],[4]	7,812,000	[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		233,890,000	[3],[4]	380,261,000	[7],[8]
Fair Value		101,737,000	[3],[4]	212,869,000	[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		63,244,000	[3],[4]	50,851,000	[7],[8]
Fair Value		$ 40,898,000	[3],[4]	$ 37,164,000	[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]	3.00%	[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]	2048-02	[7],[8]
Rate		4.41%	[3],[4]	4.40%	[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]	2019-06	[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		9.35%	[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]	2050-03	[7],[8]
Rate		5.15%	[3],[4]	5.32%	[7],[8]
Principal Only - Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	[6],[7],[8]			0.51%
Fair Value	[7],[8]			$ 3,749,000
Investment Owned, at Cost	[7],[8]			$ 3,024,000
Principal Only - Private Label Securities [Member] | Various Issuer [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[7],[8]			2030-08
Current Principal/Notional Amount	[7],[8]			$ 5,800,000
Rate	[7],[8]			0.00%
Fair Value	[7],[8]			$ 3,749,000
Interest Only - Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		0.81%	[2],[3],[4]	0.41%	[6],[7],[8]
Fair Value		$ 5,227,000	[3],[4]	$ 3,012,000	[7],[8]
Investment Owned, at Cost		4,963,000	[3],[4]	2,110,000	[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]	27,254,000	[7],[8]
Fair Value		4,254,000	[3],[4]	1,877,000	[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		36,498,000	[3],[4]	41,097,000	[7],[8]
Fair Value		$ 973,000	[3],[4]	$ 1,135,000	[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]	1.43%	[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		2044-06	[3],[4]	2044-06	[7],[8]
Rate		0.50%	[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]	2048-02	[7],[8]
Rate		2.71%	[3],[4]	1.57%	[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		245,000	[3],[4]	273,000	[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		$ 90,639,000	[3],[4]	$ 100,882,000	[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]	2048-02	[7],[8]
Private Label Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		28.98%	[2],[3],[4]	39.12%	[6],[7],[8]
Fair Value		$ 186,876,000	[3],[4]	$ 289,062,000	[7],[8]
Investment Owned, at Cost		$ 189,625,000	[3],[4]	$ 285,882,000	[7],[8]
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		168.25%	[2],[3],[4]	182.64%	[6],[7],[8]
Fair Value		$ 1,084,843,000	[3],[4]	$ 1,349,642,000	[7],[8]
Investment Owned, at Cost		$ 1,089,765,000	[3],[4]	$ 1,345,553,000	[7],[8]
Collateralized Loan Obligations [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		6.97%	[2],[3],[4]	6.22%	[6],[7],[8]
Fair Value		$ 44,956,000	[3],[4]	$ 45,974,000	[7],[8]
Investment Owned, at Cost		$ 49,087,000	[3],[4]	$ 52,576,000	[7],[8]
Collateralized Loan Obligations [Member] | North America [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		3.49%	[2],[3],[4]	2.86%	[6],[7],[8]
Fair Value		$ 22,519,000	[3],[4]	$ 21,120,000	[7],[8]
Investment Owned, at Cost		$ 25,860,000	[3],[4]	$ 26,341,000	[7],[8]
Collateralized Loan Obligations [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		3.48%	[2],[3],[4]	3.36%	[6],[7],[8]
Fair Value		$ 22,437,000	[3],[4]	$ 24,854,000	[7],[8]
Investment Owned, at Cost		23,227,000	[3],[4]	26,235,000	[7],[8]
Collateralized Loan Obligations [Member] | Various Issuer [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		69,917,000	[3],[4]	67,640,000	[7],[8]
Fair Value		22,519,000	[3],[4]	21,120,000	[7],[8]
Collateralized Loan Obligations [Member] | Various Issuer [Member] | Europe [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		28,053,000	[3],[4]	35,472,000	[7],[8]
Fair Value		$ 22,437,000	[3],[4]	$ 24,854,000	[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]	2016-05	[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		2022-01	[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		2024-06	[3],[4]	2068-09	[7],[8]
Rate		7.88%	[3],[4]	9.15%	[7],[8]
Collateralized Loan Obligations [Member] | Various Issuer [Member] | Maximum [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date		2025-03	[3],[4]	2056-12	[7],[8]
Rate		3.84%	[3],[4]	4.43%	[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		17.76%	[2],[3],[4],[11]	15.61%	[6],[7],[8],[12]
Fair Value		$ 114,472,000	[3],[4],[11]	$ 115,376,000	[7],[8],[12]
Investment Owned, at Cost		122,538,000	[3],[4],[11]	$ 115,624,000	[7],[8],[12]
Fair value of loans held in related party trust		$ 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		17.28%	[2],[3],[4],[11]	15.22%	[6],[7],[8],[12]
Fair Value		$ 111,423,000	[3],[4],[11]	$ 112,471,000	[7],[8],[12]
Investment Owned, at Cost		$ 120,405,000	[3],[4],[11]	$ 112,840,000	[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		0.48%	[2],[3],[4],[11]	0.39%	[6],[7],[8],[12]
Fair Value		$ 3,049,000	[3],[4],[11]	$ 2,905,000	[7],[8],[12]
Investment Owned, at Cost		2,133,000	[3],[4],[11]	2,784,000	[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		103,536,000	[3],[4],[11],[13],[14],[15]	109,763,000	[7],[8],[12],[16]
Fair Value		111,423,000	[3],[4],[11],[13],[14],[15]	$ 112,471,000	[7],[8],[12],[16]
Consumer loans and asset-backed securities backed by consumer loans [Member] | Various Issuer [Member] | Consumer [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date	[7],[8],[12]			2024-08
Current Principal/Notional Amount		$ 3,449,000	[3],[4],[11]	$ 2,163,000	[7],[8],[12]
Rate		0.00%	[3],[4],[11]	0.00%	[7],[8],[12]
Fair Value		$ 3,049,000	[3],[4],[11]	$ 2,905,000	[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		2017-01	[3],[4],[11],[13],[14],[15]	2016-01	[7],[8],[12],[16]
Rate		5.31%	[3],[4],[11],[13],[14],[15]	5.50%	[7],[8],[12],[16]
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	[3],[4],[11]	2024-08
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		2021-12	[3],[4],[11],[13],[14],[15]	2020-12	[7],[8],[12],[16]
Rate		60.28%	[3],[4],[11],[13],[14],[15]	49.00%	[7],[8],[12],[16]
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	[3],[4],[11]	2026-03
Corporate Debt [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		12.42%	[2],[3],[4]	3.66%	[6],[7],[8]
Fair Value		$ 80,095,000	[3],[4]	$ 27,028,000	[7],[8]
Investment Owned, at Cost		$ 81,036,000	[3],[4]	$ 34,786,000	[7],[8]
Corporate Debt [Member] | North America [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		12.13%	[2],[3],[4]	2.50%	[6],[7],[8]
Fair Value		$ 78,187,000	[3],[4]	$ 18,452,000	[7],[8]
Investment Owned, at Cost		$ 78,482,000	[3],[4]	$ 25,815,000	[7],[8]
Corporate Debt [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		0.29%	[2],[3],[4]	1.16%	[6],[7],[8]
Fair Value		$ 1,908,000	[3],[4]	$ 8,576,000	[7],[8]
Investment Owned, at Cost		2,554,000	[3],[4]	$ 8,971,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Basic Materials [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[7],[8]			2019-01
Current Principal/Notional Amount	[7],[8]			$ 5,720,000
Rate	[7],[8]			11.75%
Fair Value	[7],[8]			$ 889,000
Corporate Debt [Member] | Various Issuer [Member] | Communications [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		9,381,000
Fair Value		9,489,000
Corporate Debt [Member] | Various Issuer [Member] | Communications [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date	[7],[8]			2018-10
Current Principal/Notional Amount	[7],[8]			$ 7,885,000
Rate	[7],[8]			14.00%
Fair Value	[7],[8]			$ 8,083,000
Corporate Debt [Member] | Various Issuer [Member] | Consumer [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		22,991,000	[3],[4]	3,985,000	[7],[8]
Fair Value		24,187,000	[3],[4]	$ 1,282,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Consumer [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date	[7],[8]			2016-12
Current Principal/Notional Amount		$ 17,618,000	[3],[4]	$ 16,443,000	[7],[8]
Rate		0.00%	[3],[4]	0.00%	[7],[8]
Fair Value		$ 380,000	[3],[4]	$ 493,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Energy [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		16,170,000	[3],[4]	14,193,000	[7],[8]
Fair Value		16,951,000	[3],[4]	$ 2,459,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Financial [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[7],[8]			2023-08
Current Principal/Notional Amount	[7],[8]			$ 54,000
Rate	[7],[8]			10.25%
Fair Value	[7],[8]			$ 52,000
Corporate Debt [Member] | Various Issuer [Member] | Industrial [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[3],[4]	12,470,000
Fair Value	[3],[4]	$ 12,709,000
Corporate Debt [Member] | Various Issuer [Member] | Industrial [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	3021-03
Current Principal/Notional Amount	[3],[4]	$ 1,867,000
Rate	[3],[4]	6.50%
Fair Value	[3],[4]	$ 1,528,000
Corporate Debt [Member] | Various Issuer [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2019-10
Current Principal/Notional Amount		$ 10,500,000	[3],[4]	14,250,000	[7],[8]
Rate	[3],[4]	15.00%
Fair Value		$ 9,975,000	[3],[4]	$ 13,770,000	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Technology [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[3],[4]	3,827,000
Fair Value	[3],[4]	$ 3,937,000
Corporate Debt [Member] | Various Issuer [Member] | Utilities [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2021-07
Current Principal/Notional Amount	[3],[4]	$ 840,000
Rate	[3],[4]	7.38%
Fair Value	[3],[4]	$ 939,000
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | Communications [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2018-04
Rate	[3],[4]	6.75%
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]	2020-05	[7],[8]
Rate		3.85%	[3],[4]	0.00%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | Consumer [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2017-12
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]	2018-09	[7],[8]
Rate		6.38%	[3],[4]	6.50%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | Industrial [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2019-05
Rate	[3],[4]	3.75%
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[7],[8]			2017-12
Rate	[7],[8]			15.00%
Corporate Debt [Member] | Various Issuer [Member] | Minimum [Member] | Technology [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2020-03
Rate	[3],[4]	6.13%
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | Communications [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2022-12
Rate	[3],[4]	9.07%
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | Consumer [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2025-05	[3],[4]	2020-07	[7],[8]
Rate		11.00%	[3],[4]	10.00%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | Consumer [Member] | Europe [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2018-12
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | Energy [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date		2023-02	[3],[4]	2020-02	[7],[8]
Rate		9.63%	[3],[4]	12.25%	[7],[8]
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | Industrial [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2022-12
Rate	[3],[4]	7.75%
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[7],[8]			2019-10
Rate	[7],[8]			20.00%
Corporate Debt [Member] | Various Issuer [Member] | Maximum [Member] | Technology [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2022-08
Rate	[3],[4]	7.50%
Mortgage Loans [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		22.55%	[2],[3],[4],[11]	11.97%	[6],[7],[8],[12]
Fair Value		$ 145,419,000	[3],[4],[11]	$ 88,488,000	[7],[8],[12]
Investment Owned, at Cost		148,173,000	[3],[4],[11]	89,009,000	[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		71,020,000	[3],[4],[11],[17]	77,556,000	[7],[8],[12],[18]
Fair Value		61,129,000	[3],[4],[11],[17]	66,399,000	[7],[8],[12],[18]
Mortgage Loans [Member] | Various Issuer [Member] | Mortgage-related Residential [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount		89,658,000	[3],[4],[11],[19]	30,267,000	[7],[8],[12],[20]
Fair Value		$ 84,290,000	[3],[4],[11],[19]	$ 22,089,000	[7],[8],[12],[20]
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],[17]	2016-04	[7],[8],[12],[18]
Rate		2.73%	[3],[4],[11],[17]	2.54%	[7],[8],[12],[18]
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],[19]	2021-07	[7],[8],[12],[20]
Rate		2.00%	[3],[4],[11],[19]	1.00%	[7],[8],[12],[20]
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],[17]	2045-07	[7],[8],[12],[18]
Rate		12.12%	[3],[4],[11],[17]	12.00%	[7],[8],[12],[18]
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],[19]	2055-09	[7],[8],[12],[20]
Rate		12.63%	[3],[4],[11],[19]	13.50%	[7],[8],[12],[20]
Real Estate Owned [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		0.52%	[2],[3],[4],[11],[21]	1.70%	[6],[7],[8],[12],[22]
Fair Value		$ 3,349,000	[3],[4],[11],[21]	$ 12,522,000	[7],[8],[12],[22]
Investment Owned, at Cost		3,539,000	[3],[4],[11],[21]	12,254,000	[7],[8],[12],[22]
Real Estate Owned [Member] | Single-Family Houses [Member] | Real estate-related [Member] | North America [Member]
Schedule of Investments [Line Items]
Fair Value		$ 1,699,000	[3],[4],[11],[21]	$ 4,090,000	[7],[8],[12],[22]
Number of Real Estate Properties		9	[3],[4],[11],[21]	28	[7],[8],[12],[22]
Real Estate Owned [Member] | Commercial Property [Member] | Real estate-related [Member] | North America [Member]
Schedule of Investments [Line Items]
Fair Value		$ 1,650,000	[3],[4],[11],[21]	$ 8,432,000	[7],[8],[12],[22]
Number of Real Estate Properties		1	[3],[4],[11],[21]	2	[7],[8],[12],[22]
Private Corporate Equity Investments [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		4.11%	[2],[3],[4]	2.99%	[6],[7],[8]
Fair Value		$ 26,473,000	[3],[4]	$ 22,088,000	[7],[8]
Investment Owned, at Cost		$ 25,937,000	[3],[4]	$ 22,598,000	[7],[8]
Private Corporate Equity Investments [Member] | North America [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		4.11%	[2],[3],[4]	2.99%	[6],[7],[8]
Fair Value		$ 26,473,000	[3],[4]	$ 22,088,000	[7],[8]
Investment Owned, at Cost		$ 25,937,000	[3],[4]	$ 22,598,000	[7],[8]
Private 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]
Private Corporate Equity Investments [Member] | Non-Exchange Traded Corporate Equity [Member] | Consumer [Member] | North America [Member]
Schedule of Investments [Line Items]
Fair Value		$ 825,000	[3],[4]	$ 3,032,000	[7],[8]
Investment Owned, Balance, Shares		1,557	[3],[4]	1,592	[7],[8]
Private 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]
Private Corporate Equity Investments [Member] | Non-Exchange Traded Corporate Equity [Member] | Diversified [Member] | North America [Member]
Schedule of Investments [Line Items]
Fair Value		$ 3,162,000	[3],[4]	$ 2,389,000	[7],[8]
Investment Owned, Balance, Shares		191	[3],[4]	160	[7],[8]
Private Corporate Equity Investments [Member] | Non-Exchange Traded Corporate Equity [Member] | Technology [Member] | North America [Member]
Schedule of Investments [Line Items]
Fair Value	[7],[8]			$ 741,000
Investment Owned, Balance, Shares	[7],[8]			99
Private Corporate Equity Investments [Member] | Exchange Traded Equity [Member] | Financial [Member] | North America [Member]
Schedule of Investments [Line Items]
Fair Value	[3],[4]	$ 4,396,000
Investment Owned, Balance, Shares	[3],[4]	51
Private Corporate Equity Investments [Member] | Non-Exchange Traded Preferred Equity Investment in Commercial Mortgage-related Private Partnership | Mortgage-related Commercial [Member] | North America [Member]
Schedule of Investments [Line Items]
Fair Value	[7],[8]			$ 7,687,000
Investment Owned, Balance, Shares	[7],[8]			8,171
Private 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		$ 3,090,000	[3],[4]	$ 2,871,000	[7],[8]
Private 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		$ 14,325,000	[3],[4]	$ 4,325,000	[7],[8]
Investment Owned, Balance, Shares		1,838	[3],[4]	9,482	[7],[8]
Private 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]	$ 1,043,000	[7],[8]
Investment Owned, Balance, Shares		6,750	[3],[4]	7,479	[7],[8]
US Treasury Securities [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity	[2],[3],[4]	0.84%
Fair Value	[3],[4]	$ 5,419,000
Investment Owned, at Cost	[3],[4]	5,635,000
US Treasury Securities [Member] | US Treasury Notes Securities [Member] | Government [Member] | North America [Member]
Schedule of Investments [Line Items]
Current Principal/Notional Amount	[3],[4]	5,620,000
Fair Value	[3],[4]	$ 5,419,000
US Treasury Securities [Member] | US Treasury Notes Securities [Member] | Minimum [Member] | Government [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2021-05
Rate	[3],[4]	1.13%
US Treasury Securities [Member] | US Treasury Notes Securities [Member] | Maximum [Member] | Government [Member] | North America [Member]
Schedule of Investments [Line Items]
Investments maturity date	[3],[4]	2026-05
Rate	[3],[4]	1.63%
Long Investments [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		233.42%	[2],[3],[4]	224.79%	[6],[7],[8]
Fair Value		$ 1,505,026,000	[3],[4]	$ 1,661,118,000	[7],[8]
Investment Owned, at Cost		$ 1,525,710,000	[3],[4]	$ 1,672,400,000	[7],[8]
Long Investments [Member] | Government National Mortgage Association [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		23.36%		18.91%
Long Investments [Member] | Federal National Mortgage Association [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		73.78%		77.17%
Long Investments [Member] | Federal Home Loan Mortgage Corporation [Member]
Schedule of Investments [Line Items]
Investment owned as a percentage of equity		42.13%		47.44%
Related Party 1 [Member]
Schedule of Investments [Line Items]
Fair value of loans held in related party trust		$ 7,600,000		$ 3,800,000
Related Party 2 [Member]
Schedule of Investments [Line Items]
Fair value of loans held in related party trust		43,200,000
Related Party 3 [Member]
Schedule of Investments [Line Items]
Fair value of loans held in related party trust		$ 7,300,000

[1] 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.

[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 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%

[5] At December 31, 2015, 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 77.17%, 47.44%, and 18.91% 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 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 143.52%A/A/A 0.32%Baa/BBB/BBB 1.07%Ba/BB/BB or below 34.89%Unrated 44.99%

[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 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.

[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 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.

[14] 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.

[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 $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.

[16] Includes investments in participation certificates related to loans held in a trust owned by a related party of Ellington Financial Management LLC. Through its participation certificates, the Company has beneficial interests in the cash flows of the underlying loans held by the trust. At December 31, 2015 loans held in the related party trust for which the Company has beneficial interests in the residual cash flows, totaled $3.8 million.

[17] 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.

[18] Includes non-performing commercial loans in the amount of $22.6 million whereby principal and/or interest is past due and a maturity date is not applicable.

[19] 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.

[20] As of December 31, 2015, the Company had residential mortgage loans that were in the process of foreclosure with a fair value of $5.9 million.

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

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