Consolidated Condensed Schedule Of Investments (Financial Derivatives)		9 Months Ended		12 Months Ended
		Sep. 30, 2016 USD ($) contracts		Dec. 31, 2015 USD ($) contracts
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	[1]	$ 64,817,000		$ 162,905,000
Derivative Liabilities	[1]	(39,816,000)		(60,472,000)
Net cost		63,635,000		163,943,000
Net proceeds		(17,751,000)		(56,200,000)
Eurodollar Future [Member]
Investment Holdings, Other than Securities [Line Items]
Future contract notional		$ 1,000,000		$ 1,000,000
Future contract | contracts		1		1
Financial Derivatives - Assets [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset		$ 64,817,000	[2]	$ 162,905,000	[3]
Financial Derivative Assets, Percent of Net Assets		9.75%	[2],[4]	22.05%	[3],[5]
Net cost		$ 63,635,000	[2]	$ 163,934,000	[3]
Financial Derivatives - Assets [Member] | Affiliates of Bank of America [Member]
Investment Holdings, Other than Securities [Line Items]
Financial Derivative Assets, Percent of Net Assets				6.01%
Financial Derivatives - Assets [Member] | Swap [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset		$ 57,215,000	[2]	$ 159,423,000	[3],[6]
Financial Derivative Assets, Percent of Net Assets		8.61%	[2],[4]	21.58%	[3],[5],[6]
Net cost		$ 56,047,000	[2]	$ 161,193,000	[3],[6]
Financial Derivatives - Assets [Member] | Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset		$ 14,000	[2]	$ 32,000	[3]
Financial Derivative Assets, Percent of Net Assets		0.00%	[2],[4]	0.01%	[3],[5]
Financial Derivatives - Assets [Member] | Forwards [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	[3]			$ 1,138,000
Financial Derivative Assets, Percent of Net Assets	[3],[5]			0.15%
Financial Derivatives - Assets [Member] | Options [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset		$ 2,000	[2]	$ 2,162,000	[3]
Financial Derivative Assets, Percent of Net Assets		0.00%	[2],[4]	0.29%	[3],[5]
Net cost		$ 2,000	[2]	$ 2,600,000	[3]
Financial Derivatives - Assets [Member] | Warrant [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	[3]			$ 150,000
Financial Derivative Assets, Percent of Net Assets		1.14%	[2],[4]	0.02%	[3],[5]
Net cost		$ 7,586,000	[2]	$ 150,000	[3]
Financial Derivatives - Assets [Member] | Warrant [Member] | North America [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	[2]	7,586,000
Financial Derivatives - Liabilities [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities		$ (39,816,000)	[2]	$ (60,472,000)	[3]
Financial Derivative Liabilities, Percent of Net Assets		(5.99%)	[2],[4]	(8.18%)	[3],[5]
Net proceeds		$ (17,751,000)	[2]	$ (56,200,000)	[3]
Financial Derivatives - Liabilities [Member] | Affiliates of JP Morgan [Member]
Investment Holdings, Other than Securities [Line Items]
Financial Derivative Liabilities, Percent of Net Assets				(6.32%)
Financial Derivatives - Liabilities [Member] | Swap [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities	[3],[6]			$ (58,163,000)
Financial Derivative Liabilities, Percent of Net Assets		(5.93%)	[2],[4]	(7.87%)	[3],[5],[6]
Net proceeds		$ (17,722,000)	[2]	$ (53,679,000)	[3],[6]
Financial Derivatives - Liabilities [Member] | Swap [Member] | North America [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities	[2]	(39,443,000)
Financial Derivatives - Liabilities [Member] | Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities		$ (93,000)	[2]	$ (528,000)	[3]
Financial Derivative Liabilities, Percent of Net Assets		(0.02%)	[2],[4]	(0.07%)	[3],[5]
Financial Derivatives - Liabilities [Member] | Forwards [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities		$ (277,000)	[2]	$ (13,000)	[3]
Financial Derivative Liabilities, Percent of Net Assets		(0.04%)	[2],[4]	0.00%	[3],[5]
Financial Derivatives - Liabilities [Member] | Options [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities		$ (3,000)	[2]	$ (1,760,000)	[3]
Financial Derivative Liabilities, Percent of Net Assets		0.00%	[2],[4]	(0.24%)	[3],[5]
Net proceeds		$ (29,000)	[2]	$ (2,521,000)	[3]
Financial Derivatives - Liabilities [Member] | Mortgage Loan Purchase Commitments [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities	[3]			$ (8,000)
Financial Derivative Liabilities, Percent of Net Assets	[3],[5]			0.00%
Put Option [Member] | Options on U.S. Treasury Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Number of contracts | contracts				39
Call Option [Member] | Options on U.S. Treasury Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Number of contracts | contracts				39
Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Mortgage Loan Purchase Commitments [Member] | Mortgage-related Residential [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[7]			$ 7,713,000
Derivative Liabilities	[3],[7]			$ (8,000)
Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Mortgage Loan Purchase Commitments [Member] | Mortgage-related Residential [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[7]			2016-01
Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Mortgage Loan Purchase Commitments [Member] | Mortgage-related Residential [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[7]			2016-02
Equity Market Risk [Member] | Financial Derivatives - Assets [Member] | Warrant [Member] | North America [Member] | Mortgage-related Residential [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset		7,586,000	[2],[8]	$ 150,000	[3],[9]
Derivative notional		1,647,000	[2],[8]	$ 1,555,000	[3],[9]
Long [Member] | US Treasury Note Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Number of contracts | contracts				343
Long [Member] | Financial Derivatives - Assets [Member] | Total Return Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	[3],[6]			$ 85,000
Long [Member] | Financial Derivatives - Assets [Member] | Total Return Swaps [Member] | North America [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	[2],[10]	196,000
Long [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	[2],[11]	1,128,000
Long [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities	[3],[6]			(4,662,000)
Long [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities	[2],[10]	(1,223,000)
Long [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities	[2],[11]	$ (3,432,000)
Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	[3],[6],[12]			$ 135,752,000
Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Asset Backed Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2037-12	[2],[11]	2037-12	[3],[6],[12]
Derivative Asset		$ 13,000	[2],[11]	$ 56,000	[3],[6],[12]
Derivative notional		1,272,000	[2],[11]	1,468,000	[3],[6],[12]
Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Total Return Swaps [Member] | North America [Member] | Communications [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	[3],[6],[13]			49,000
Derivative notional	[3],[6],[13]			$ 3,836,000
Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Total Return Swaps [Member] | North America [Member] | Communications [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[13]			2016-03
Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Total Return Swaps [Member] | North America [Member] | Communications [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[13]			2016-12
Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Total Return Swaps [Member] | North America [Member] | Consumer [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset		135,000	[2],[10]	$ 31,000	[3],[6],[13]
Derivative notional		$ 3,130,000	[2],[10]	$ 4,880,000	[3],[6],[13]
Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Total Return Swaps [Member] | North America [Member] | Consumer [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2017-02	[2],[10]	2016-03	[3],[6],[13]
Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Total Return Swaps [Member] | North America [Member] | Consumer [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2017-03	[2],[10]	2017-01	[3],[6],[13]
Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Total Return Swaps [Member] | North America [Member] | Energy [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[13]			2016-10
Derivative Asset	[3],[6],[13]			$ 5,000
Derivative notional	[3],[6],[13]			729,000
Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Total Return Swaps [Member] | North America [Member] | Utilities [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[10]	2017-02
Derivative Asset	[2],[10]	$ 61,000
Derivative notional	[2],[10]	$ 687,000
Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Communications [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[11]	2021-06
Derivative Asset	[2],[11]	$ 71,000
Derivative notional	[2],[11]	1,300,000
Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Consumer [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	[2],[11]	923,000
Derivative notional	[2],[11]	$ 9,516,000
Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Consumer [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[11]	2019-03
Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Consumer [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[11]	2021-12
Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Utilities [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[11]	2021-06
Derivative Asset	[2],[11]	$ 134,000
Derivative notional	[2],[11]	3,220,000
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Asset Backed Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		27,664,000	[2],[11]	4,458,000	[3],[6],[12]
Derivative Liabilities		$ (3,085,000)	[2],[11]	$ (365,000)	[3],[6],[12]
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Asset Backed Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2047-01	[2],[11]	2052-10	[3],[6],[12]
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Asset Backed Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2063-05	[2],[11]	2063-05	[3],[6],[12]
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Basic Materials [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2017-02	[2],[10]	2016-03	[3],[6],[13]
Derivative notional		$ 5,341,000	[2],[10]	$ 6,477,000	[3],[6],[13]
Derivative Liabilities		$ (403,000)	[2],[10]	(822,000)	[3],[6],[13]
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Communications [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[10]	2017-02
Derivative notional		$ 2,308,000	[2],[10]	11,009,000	[3],[6],[13]
Derivative Liabilities		$ (273,000)	[2],[10]	$ (2,581,000)	[3],[6],[13]
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Communications [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[13]			2016-03
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Communications [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[13]			2016-08
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Consumer [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[10]	2017-02
Derivative notional		$ 2,098,000	[2],[10]	$ 4,983,000	[3],[6],[13]
Derivative Liabilities		(547,000)	[2],[10]	$ (143,000)	[3],[6],[13]
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Consumer [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[13]			2016-06
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Consumer [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[13]			2016-08
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Industrial [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[13]			2016-03
Derivative notional	[3],[6],[13]			$ 1,000,000
Derivative Liabilities	[3],[6],[13]			$ (39,000)
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Diversified [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[13]			2016-03
Derivative notional	[3],[6],[13]			$ 2,765,000
Derivative Liabilities	[3],[6],[13]			(171,000)
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Energy [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[6],[13]			4,076,000
Derivative Liabilities	[3],[6],[13]			$ (812,000)
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Energy [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[13]			2016-04
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Energy [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[13]			2016-08
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Financial [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[13]			2016-09
Derivative notional	[3],[6],[13]			$ 2,646,000
Derivative Liabilities	[3],[6],[13]			$ (10,000)
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Technology [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[13]			2017-01
Derivative notional	[3],[6],[13]			$ 2,650,000
Derivative Liabilities	[3],[6],[13]			$ (84,000)
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Basic Materials [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[2],[11]	5,600,000
Derivative Liabilities	[2],[11]	$ (928,000)
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Basic Materials [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[11]	2021-06
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Basic Materials [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[11]	2021-12
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Communications [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[11]	2021-06
Derivative notional	[2],[11]	$ 3,310,000
Derivative Liabilities	[2],[11]	(66,000)
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Consumer [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[2],[11]	5,290,000
Derivative Liabilities	[2],[11]	$ (293,000)
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Consumer [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[11]	2021-06
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Consumer [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[11]	2021-12
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Energy [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[2],[11]	$ 12,707,000
Derivative Liabilities	[2],[11]	$ (2,145,000)
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Energy [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[11]	2018-03
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Energy [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[11]	2021-12
Long [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | Europe [Member] | Basic Materials [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[11]	2019-12
Derivative notional	[2],[11]	$ 12,000
Derivative Liabilities	[2],[11]	(6,000)
Long [Member] | Credit Risk [Member] | Put Option [Member] | Financial Derivatives - Assets [Member] | Options on Credit Default Swaps on Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[14]			2016-03
Derivative Asset	[3],[14]			$ 2,050,000
Derivative notional	[3],[14]			138,000,000
Long [Member] | Interest Rate Risk [Member] | Financial Derivatives - Assets [Member] | Interest Rate Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset		11,488,000	[2],[15]	7,254,000	[3],[6],[16]
Derivative notional		$ 353,545,000	[2],[15]	$ 545,232,000	[3],[6],[16]
Long [Member] | Interest Rate Risk [Member] | Financial Derivatives - Assets [Member] | Interest Rate Swaps [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2016-10	[2],[15]	2016-12	[3],[6],[16]
Long [Member] | Interest Rate Risk [Member] | Financial Derivatives - Assets [Member] | Interest Rate Swaps [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2046-07	[2],[15]	2045-12	[3],[6],[16]
Long [Member] | Interest Rate Risk [Member] | Financial Derivatives - Assets [Member] | US Treasury Note Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[17]			2016-03
Derivative Asset	[3],[17]			$ 2,000
Derivative notional	[3],[17]			$ 6,300,000
Long [Member] | Interest Rate Risk [Member] | Financial Derivatives - Assets [Member] | Eurodollar Future [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[18]			2017-06
Derivative Asset	[3],[18]			$ 17,000
Derivative notional	[3],[18]			23,000,000
Long [Member] | Interest Rate Risk [Member] | Financial Derivatives - Assets [Member] | Interest Rate Cap [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	[2],[19]	$ 2,000
Derivative notional	[2],[19]	$ 61,908,000
Long [Member] | Interest Rate Risk [Member] | Financial Derivatives - Assets [Member] | Interest Rate Cap [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[19]	2018-03
Long [Member] | Interest Rate Risk [Member] | Financial Derivatives - Assets [Member] | Interest Rate Cap [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[19]	2018-10
Long [Member] | Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Interest Rate Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ 125,211,000	[2],[15]	129,975,000	[3],[6],[16]
Derivative Liabilities		$ (701,000)	[2],[15]	$ (278,000)	[3],[6],[16]
Long [Member] | Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Interest Rate Swaps [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2019-02	[2],[15]	2016-10	[3],[6],[16]
Long [Member] | Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Interest Rate Swaps [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2045-01	[2],[15]	2045-12	[3],[6],[16]
Long [Member] | Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | US Treasury Note Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[17]			2016-03
Derivative notional	[3],[17]			$ 37,700,000
Derivative Liabilities	[3],[17]			$ (235,000)
Long [Member] | Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Eurodollar Future [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[20]	2017-06
Derivative notional	[2],[20]	$ 11,000,000
Derivative Liabilities	[2],[20]	(3,000)
Long [Member] | Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Straddle Swaption [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[21]			2018-11
Derivative notional	[3],[21]			$ 8,400,000
Derivative Liabilities	[3],[21]			$ (31,000)
Long [Member] | Interest Rate Risk [Member] | Put Option [Member] | Financial Derivatives - Assets [Member] | Options on U.S. Treasury Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[22]			2016-02
Derivative Asset	[3],[22]			$ 61,000
Derivative notional	[3],[22]			$ 3,900,000
Long [Member] | Interest Rate Risk [Member] | Call Option [Member] | Financial Derivatives - Assets [Member] | Options on U.S. Treasury Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[22]			2016-02
Derivative Asset	[3],[22]			$ 51,000
Derivative notional	[3],[22]			$ 3,900,000
Long [Member] | Currency risk [Member] | Financial Derivatives - Liabilities [Member] | Forwards [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[23]			2016-03
Derivative notional	[3],[23]			$ 2,734,000
Derivative Liabilities	[3],[23]			$ (13,000)
Long [Member] | Equity Market Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Energy [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[24]			2017-07
Derivative notional	[3],[6],[24]			$ 35,000
Derivative Liabilities	[3],[6],[24]			$ 0
Long [Member] | Equity Market Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Financial [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[24]			2016-11
Derivative notional	[3],[6],[24]			$ 21,635,000
Derivative Liabilities	[3],[6],[24]			0
Short [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	[2],[25]	1,631,000
Short [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities	[3],[6]			0
Short [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities	[3],[6],[26]			(683,000)
Short [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities	[2],[25]	(3,458,000)
Short [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	[3],[6],[26]			1,891,000
Derivative notional	[3],[6],[26]			$ (15,208,000)
Short [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bond Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[26]			2017-12
Short [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bond Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[26]			2019-12
Short [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Asset Backed Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset		20,959,000	[2],[25]	$ 5,354,000	[3],[6],[26]
Derivative notional		$ (134,719,000)	[2],[25]	$ (95,589,000)	[3],[6],[26]
Short [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Asset Backed Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2046-05	[2],[25]	2046-05	[3],[6],[26]
Short [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Asset Backed Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2058-09	[2],[25]	2063-05	[3],[6],[26]
Short [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Basic Materials [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[25]	2020-03
Derivative Asset	[2],[25]	$ 271,000
Derivative notional	[2],[25]	(4,650,000)
Short [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Consumer [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[26]			2019-12
Derivative Asset	[3],[6],[26]			$ 10,000
Derivative notional	[3],[6],[26]			(590,000)
Short [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Energy [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	[2],[25]	1,360,000
Derivative notional	[2],[25]	$ (18,760,000)
Short [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Energy [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[25]	2017-06
Short [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Energy [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[25]	2021-12
Short [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Asset Backed Securities [Member] | North America [Member] | Mortgage-related Residential [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset		$ 5,857,000	[2],[25]	6,332,000	[3],[6],[26]
Derivative notional		$ (7,582,000)	[2],[25]	$ (8,967,000)	[3],[6],[26]
Short [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Asset Backed Securities [Member] | North America [Member] | Mortgage-related Residential [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2035-05	[2],[25]	2034-09	[3],[6],[26]
Short [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Asset Backed Securities [Member] | North America [Member] | Mortgage-related Residential [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2035-12	[2],[25]	2035-12	[3],[6],[26]
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ (269,035,000)	[2],[25]	$ (1,001,913,000)	[3],[6],[26]
Derivative Liabilities		$ (9,594,000)	[2],[25]	$ (47,298,000)	[3],[6],[26]
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bond Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2016-12	[2],[25]	2016-12	[3],[6],[26]
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bond Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2021-06	[2],[25]	2020-12	[3],[6],[26]
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Basic Materials [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[2],[25]	$ (2,320,000)
Derivative Liabilities	[2],[25]	$ (72,000)
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Basic Materials [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[25]	2017-06
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Basic Materials [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[25]	2021-03
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Communications [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[25]	2021-06
Derivative notional	[2],[25]	$ (1,300,000)
Derivative Liabilities	[2],[25]	(71,000)
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Consumer [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		(26,590,000)	[2],[25]	$ (8,780,000)	[3],[6],[26]
Derivative Liabilities		$ (2,747,000)	[2],[25]	$ (584,000)	[3],[6],[26]
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Consumer [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2019-03	[2],[25]	2019-09	[3],[6],[26]
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Consumer [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2021-12	[2],[25]	2020-12	[3],[6],[26]
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Industrial [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[2],[25]	$ (8,380,000)
Derivative Liabilities	[2],[25]	$ (69,000)
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Industrial [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[25]	2021-06
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Industrial [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[25]	2021-12
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Financial [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[26]			2020-03
Derivative notional	[3],[6],[26]			$ (4,000,000)
Derivative Liabilities	[3],[6],[26]			(99,000)
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Technology [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[25]	2020-03
Derivative notional	[2],[25]	$ (3,020,000)
Derivative Liabilities	[2],[25]	$ (378,000)
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Corporate Bonds [Member] | North America [Member] | Utilities [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[25]	2021-06
Derivative notional	[2],[25]	$ (860,000)
Derivative Liabilities	[2],[25]	(121,000)
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Asset Backed Securities [Member] | North America [Member] | Mortgage-related Residential [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		(3,093,000)	[2],[25]	(3,209,000)	[3],[6],[26]
Derivative Liabilities		$ (262,000)	[2],[25]	$ (221,000)	[3],[6],[26]
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Asset Backed Securities [Member] | North America [Member] | Mortgage-related Residential [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2034-10	[2],[25]	2034-10	[3],[6],[26]
Short [Member] | Credit Risk [Member] | Financial Derivatives - Liabilities [Member] | Credit Default Swaps On Asset Backed Securities [Member] | North America [Member] | Mortgage-related Residential [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2035-03	[2],[25]	2035-03	[3],[6],[26]
Short [Member] | Credit Risk [Member] | Put Option [Member] | Financial Derivatives - Liabilities [Member] | Options on Credit Default Swaps on Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[27]	2016-10
Derivative notional		$ (29,000,000)	[2],[27]	$ (171,750,000)	[3],[28]
Derivative Liabilities		(3,000)	[2],[27]	$ (720,000)	[3],[28]
Short [Member] | Credit Risk [Member] | Put Option [Member] | Financial Derivatives - Liabilities [Member] | Options on Credit Default Swaps on Corporate Bond Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[28]			2016-02
Short [Member] | Credit Risk [Member] | Put Option [Member] | Financial Derivatives - Liabilities [Member] | Options on Credit Default Swaps on Corporate Bond Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[28]			2016-03
Short [Member] | Credit Risk [Member] | Call Option [Member] | Financial Derivatives - Liabilities [Member] | Options on Credit Default Swaps on Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[29]			$ (273,100,000)
Derivative Liabilities	[3],[29]			$ (884,000)
Short [Member] | Credit Risk [Member] | Call Option [Member] | Financial Derivatives - Liabilities [Member] | Options on Credit Default Swaps on Corporate Bond Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[29]			2016-01
Short [Member] | Credit Risk [Member] | Call Option [Member] | Financial Derivatives - Liabilities [Member] | Options on Credit Default Swaps on Corporate Bond Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[29]			2016-02
Short [Member] | Interest Rate Risk [Member] | Financial Derivatives - Assets [Member] | Interest Rate Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset		93,000	[2],[30]	$ 2,689,000	[3],[6],[31]
Derivative notional		$ (60,379,000)	[2],[30]	$ (608,365,000)	[3],[6],[31]
Short [Member] | Interest Rate Risk [Member] | Financial Derivatives - Assets [Member] | Interest Rate Swaps [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2018-04	[2],[30]	2016-12	[3],[6],[31]
Short [Member] | Interest Rate Risk [Member] | Financial Derivatives - Assets [Member] | Interest Rate Swaps [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2045-01	[2],[30]	2045-12	[3],[6],[31]
Short [Member] | Interest Rate Risk [Member] | Financial Derivatives - Assets [Member] | Eurodollar Future [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2016-12	[2],[20]	2016-12	[3],[18]
Derivative Asset		$ 14,000	[2],[20]	$ 13,000	[3],[18]
Derivative notional		(102,000,000)	[2],[20]	(90,000,000)	[3],[18]
Short [Member] | Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Interest Rate Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		(765,451,000)	[2],[30]	(518,235,000)	[3],[6],[31]
Derivative Liabilities		$ (17,504,000)	[2],[30]	$ (4,656,000)	[3],[6],[31]
Short [Member] | Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Interest Rate Swaps [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2016-10	[2],[30]	2016-01	[3],[6],[31]
Short [Member] | Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Interest Rate Swaps [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2046-05	[2],[30]	2046-01	[3],[6],[31]
Short [Member] | Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Interest Rate Basis Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[2],[32]	$ (100,200,000)
Derivative Liabilities	[2],[32]	$ (94,000)
Short [Member] | Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Interest Rate Basis Swaps [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[32]	2017-06
Short [Member] | Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Interest Rate Basis Swaps [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[32]	2019-06
Short [Member] | Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Eurodollar Future [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional		$ (62,000,000)	[2],[20]	$ (306,000,000)	[3],[18]
Derivative Liabilities		$ (90,000)	[2],[20]	$ (293,000)	[3],[18]
Short [Member] | Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Eurodollar Future [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2017-03	[2],[20]	2016-03	[3],[18]
Short [Member] | Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Eurodollar Future [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2017-09	[2],[20]	2017-09	[3],[18]
Short [Member] | Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Straddle Swaption [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative notional	[3],[21]			$ (13,100,000)
Derivative Liabilities	[3],[21]			$ (125,000)
Short [Member] | Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Straddle Swaption [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3]			2016-01
Short [Member] | Interest Rate Risk [Member] | Financial Derivatives - Liabilities [Member] | Straddle Swaption [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3]			2016-06
Short [Member] | Currency risk [Member] | Financial Derivatives - Assets [Member] | Forwards [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[33]			2016-03
Derivative Asset	[3],[33]			$ 1,138,000
Derivative notional	[3],[33]			$ (95,326,000)
Short [Member] | Currency risk [Member] | Financial Derivatives - Liabilities [Member] | Forwards [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[34]	2016-12
Derivative notional	[2],[34]	$ (53,422,000)
Derivative Liabilities	[2],[34]	$ (277,000)
Short [Member] | Equity Market Risk [Member] | Financial Derivatives - Assets [Member] | Total Return Swaps [Member] | North America [Member] | Financial [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[35]	2018-08
Derivative Asset	[2],[35]	$ 1,000
Derivative notional	[2],[35]	(46,662,000)
Short [Member] | Equity Market Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Energy [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[24]			2017-07
Derivative notional	[3],[6],[24]			$ (58,000)
Derivative Liabilities	[3],[6],[24]			$ 0
Short [Member] | Equity Market Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Financial [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[24]			2017-03
Derivative notional		(99,938,000)	[2],[35]	$ (4,048,000)	[3],[6],[24]
Derivative Liabilities		$ (84,000)	[2],[35]	$ 0	[3],[6],[24]
Short [Member] | Equity Market Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Financial [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[35]	2017-05
Short [Member] | Equity Market Risk [Member] | Financial Derivatives - Liabilities [Member] | Total Return Swaps [Member] | North America [Member] | Financial [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[2],[35]	2018-08
CDX.NA.HY 25 35-100 [Member] | Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[12]			2020-12
Derivative Asset	[3],[6],[12]			$ 81,758,000
Derivative notional	[3],[6],[12]			$ 442,140,000
ITRX EUR XOVER 24 5Y 35-100 [Member] | Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date	[3],[6],[12]			2020-12
Derivative Asset	[3],[6],[12]			$ 46,716,000
Derivative notional	[3],[6],[12]			229,954,000
Other Credit Default Swaps on Corporate Bond Indices [Member] | Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset		$ 15,849,000	[2],[11]	7,278,000	[3],[6],[12]
Derivative notional		$ 157,716,000	[2],[11]	$ 121,730,000	[3],[6],[12]
Other Credit Default Swaps on Corporate Bond Indices [Member] | Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bond Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2018-12	[2],[11]	2018-06	[3],[6],[12]
Other Credit Default Swaps on Corporate Bond Indices [Member] | Long [Member] | Credit Risk [Member] | Financial Derivatives - Assets [Member] | Credit Default Swaps On Corporate Bond Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Derivatives Maturity Date		2021-06	[2],[11]	2020-06	[3],[6],[12]

[1] In the Company's Consolidated Statement of Assets, Liabilities, and Equity, all balances associated with repurchase agreements, reverse repurchase agreements, and financial derivatives are presented on a gross basis.

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

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

[4] Classification percentages are based on Total Equity.

[5] Classification percentages are based on Total Equity.

[6] The following table shows the Company's swap assets and liabilities by dealer as a percentage of Total Equity:Dealer/Parent Company Asset/Liability Percent of EquityAffiliates of Bank of America Financial derivatives—asset 6.01 %Affiliates of JP Morgan Financial derivatives—liability (6.32)%

[7] Notional value represents principal balance of mortgage loan purchase commitments. Actual loan purchases are contingent upon successful loan closings in accordance with agreed-upon parameters.

[8] Notional value represents number of shares that warrants are convertible into.

[9] Notional value represents number of shares that warrants are convertible into.

[10] Notional value represents outstanding principal balance on underlying corporate debt.

[11] For long credit default swaps, the Company sold protection.

[12] For long credit default swaps, the Company sold protection.

[13] Notional value represents outstanding principal balance on underlying corporate debt.

[14] Represents the option on the part of the Company to enter into a credit default swap on a corporate bond index whereby the Company would pay a fixed rate and receive credit protection payments.

[15] For long interest rate swap contracts, the Company pays a floating rate and receives a fixed rate.

[16] For long interest rate swap contracts, the Company pays a floating rate and receives a fixed rate.

[17] Notional value represents the total face amount of U.S. Treasury Notes underlying all contracts held; as of December 31, 2015, 343 long futures contracts were held.

[18] Every $1,000,000 in notional value represents one contract.

[19] Notional value represents the amount on which interest payments are calculated to the extent the market interest rate exceeds the rate cap on the contract.

[20] Every $1,000,000 in notional value represents one contract.

[21] Represents the combination of a written payer swaption and a written receiver swaption on the same underlying swap.

[22] Represents the option on the part of the Company to enter into a futures contract with a counterparty; as of December 31, 2015, 39 put options and 39 call options contracts were held.

[23] Notional value represents U.S. Dollars to be paid by the Company at the maturity of the forward contract.

[24] Notional value represents number of underlying shares times the closing price of the underlying security.

[25] For short credit default swaps, the Company purchased protection.

[26] For short credit default swaps, the Company purchased protection.

[27] Represents the option on the part of a counterparty to enter into a credit default swap on a corporate bond index whereby the Company would receive a fixed rate and pay credit protection payments.

[28] Represents the option on the part of a counterparty to enter into a credit default swap on a corporate bond index whereby the Company would receive a fixed rate and pay credit protection payments.

[29] Represents the option on the part of a counterparty to enter into a credit default swap on a corporate bond index whereby the Company would pay a fixed rate and receive credit protection payments.

[30] For short interest rate swap contracts, the Company pays a fixed rate and receives a floating rate.

[31] For short interest rate swap contracts, the Company pays a fixed rate and receives a floating rate.

[32] The Company pays a floating rate and receives a floating rate.

[33] Notional value represents U.S. Dollars to be received by the Company at the maturity of the forward contract.

[34] Notional value represents U.S. Dollars to be received by the Company at the maturity of the forward contract.

[35] Notional value represents number of underlying shares times the closing price of the underlying security.