Consolidated Condensed Schedule Of Investments (Financial Derivatives)		6 Months Ended		12 Months Ended
		Jun. 30, 2015 USD ($) contracts		Dec. 31, 2014 USD ($) contracts
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	[1]	$ 91,665,000		$ 80,029,000
Derivative Liabilities	[1]	(45,565,000)		(66,116,000)
Net cost		87,291,000		61,560,000
Net proceeds		$ (35,500,000)		$ (33,555,000)
Index multiplier		50
Long US Treasury Note Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Number of contracts | contracts		1,644		1,346
Long Index Future [Member]
Investment Holdings, Other than Securities [Line Items]
Number of contracts | contracts		81
Eurodollar Future [Member]
Investment Holdings, Other than Securities [Line Items]
Future contract notional		$ 1,000,000		$ 1,000,000
Future contract | contracts		1		1
Purchased Options on U.S. Treasury Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Number of contracts | contracts				110
Financial Derivatives - Assets [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset		$ 91,665,000	[2]	$ 80,029,000	[3],[4]
Investment owned as a percentage of equity		11.80%	[2],[5]	10.15%	[3],[4],[6]
Net cost		$ 87,291,000	[2]	$ 61,560,000	[3],[4]
Financial Derivatives - Assets [Member] | Affiliates of Bank of America [Member]
Investment Holdings, Other than Securities [Line Items]
Investment owned as a percentage of equity		5.40%
Financial Derivatives - Assets [Member] | Long Credit Default Swap On Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Credit	[2],[7],[8]	Credit	[3],[4],[9]
Derivative Asset, Notional Amount		$ 432,911,000	[2],[7],[8]	$ 311,983,000	[3],[4],[9]
Derivative Asset		$ 61,542,000	[2],[7],[8]	$ 35,865,000	[3],[4],[9]
Financial Derivatives - Assets [Member] | Long Credit Default Swap On Corporate Bond Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2017-12	[2],[7],[8]	2017-12	[3],[4],[9]
Financial Derivatives - Assets [Member] | Long Credit Default Swap On Corporate Bond Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2020-06	[2],[7],[8]	2019-12	[3],[4],[9]
Financial Derivatives - Assets [Member] | Long Credit Default Swap On Asset Backed Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Credit	[2],[7],[8]	Credit	[3],[4],[9]
Derivative Asset, Notional Amount		$ 1,608,000	[2],[7],[8]	$ 3,734,000	[3],[4],[9]
Range of expiration dates	[2],[7],[8]	2037-12
Derivative Asset		$ 62,000	[2],[7],[8]	$ 61,000	[3],[4],[9]
Financial Derivatives - Assets [Member] | Long Credit Default Swap On Asset Backed Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[3],[4],[9]			2037-12
Financial Derivatives - Assets [Member] | Long Credit Default Swap On Asset Backed Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[3],[4],[9]			2063-05
Financial Derivatives - Assets [Member] | Long Interest Rate Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Interest Rates	[2],[8],[10]	Interest Rates	[3],[4],[11]
Derivative Asset, Notional Amount		$ 688,996,000	[2],[8],[10]	$ 1,017,067,000	[3],[4],[11]
Derivative Asset		$ 10,328,000	[2],[8],[10]	$ 23,243,000	[3],[4],[11]
Financial Derivatives - Assets [Member] | Long Interest Rate Swaps [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2016-10	[2],[8],[10]	2016-07	[3],[4],[11]
Financial Derivatives - Assets [Member] | Long Interest Rate Swaps [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2025-06	[2],[8],[10]	2044-12	[3],[4],[11]
Financial Derivatives - Assets [Member] | Long Total Return Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset	[2],[8]	$ 247,000
Financial Derivatives - Assets [Member] | Long Total Return Swaps [Member] | North America [Member] | Financial [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[3],[4],[12]			Equity Market
Derivative Asset, Notional Amount	[3],[4],[12]			$ 875,000
Range of expiration dates	[3],[4],[12]			2015-06
Derivative Asset	[3],[4],[12]			$ 8,000
Financial Derivatives - Assets [Member] | Long Total Return Swaps [Member] | North America [Member] | Communications [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[8],[13]	Credit
Derivative Asset, Notional Amount	[2],[8],[13]	$ 2,693,000
Range of expiration dates	[2],[8],[13]	2016-03
Derivative Asset	[2],[8],[13]	$ 33,000
Financial Derivatives - Assets [Member] | Long Total Return Swaps [Member] | North America [Member] | Consumer [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[8],[13]	Credit
Derivative Asset, Notional Amount	[2],[8],[13]	$ 6,076,000
Derivative Asset	[2],[8],[13]	$ 31,000
Financial Derivatives - Assets [Member] | Long Total Return Swaps [Member] | North America [Member] | Consumer [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[2],[8],[13]	2016-03
Financial Derivatives - Assets [Member] | Long Total Return Swaps [Member] | North America [Member] | Consumer [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[2],[8],[13]	2016-06
Financial Derivatives - Assets [Member] | Long Total Return Swaps [Member] | North America [Member] | Diversified [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[8],[13]	Credit
Derivative Asset, Notional Amount	[2],[8],[13]	$ 2,779,000
Range of expiration dates	[2],[8],[13]	2016-03
Derivative Asset	[2],[8],[13]	$ 16,000
Financial Derivatives - Assets [Member] | Long Total Return Swaps [Member] | North America [Member] | Industrial [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[8],[13]	Credit
Derivative Asset, Notional Amount	[2],[8],[13]	$ 2,700,000
Range of expiration dates	[2],[8],[13]	2016-03
Derivative Asset	[2],[8],[13]	$ 163,000
Financial Derivatives - Assets [Member] | Long Total Return Swaps [Member] | North America [Member] | Technology [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[8],[13]	Credit
Derivative Asset, Notional Amount	[2],[8],[13]	$ 1,400,000
Range of expiration dates	[2],[8],[13]	2016-06
Derivative Asset	[2],[8],[13]	$ 4,000
Financial Derivatives - Assets [Member] | Short Credit Default Swap On Asset Backed Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Credit	[2],[8],[14]	Credit	[3],[4],[15]
Derivative Asset, Notional Amount		$ (64,458,000)	[2],[8],[14]	$ (50,981,000)	[3],[4],[15]
Derivative Asset		$ 2,532,000	[2],[8],[14]	$ 1,820,000	[3],[4],[15]
Financial Derivatives - Assets [Member] | Short Credit Default Swap On Asset Backed Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2046-05	[2],[8],[14]	2046-05	[3],[4],[15]
Financial Derivatives - Assets [Member] | Short Credit Default Swap On Asset Backed Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2063-05	[2],[8],[14]	2052-10	[3],[4],[15]
Financial Derivatives - Assets [Member] | Short Interest Rate Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Interest Rates	[2],[8],[16]	Interest Rates	[3],[4],[17]
Derivative Asset, Notional Amount		$ (516,806,000)	[2],[8],[16]	$ (627,931,000)	[3],[4],[17]
Derivative Asset		$ 4,693,000	[2],[8],[16]	$ 5,411,000	[3],[4],[17]
Financial Derivatives - Assets [Member] | Short Interest Rate Swaps [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2018-03	[2],[8],[16]	2016-10	[3],[4],[17]
Financial Derivatives - Assets [Member] | Short Interest Rate Swaps [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2045-02	[2],[8],[16]	2044-12	[3],[4],[17]
Financial Derivatives - Assets [Member] | Short Credit Default Swap On Asset Backed Securities [Member] | North America [Member] | Mortgage-related Residential [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Credit	[2],[8],[14]	Credit	[3],[4],[15]
Derivative Asset, Notional Amount		$ (14,937,000)	[2],[8],[14]	$ (17,691,000)	[3],[4],[15]
Derivative Asset		$ 9,449,000	[2],[8],[14]	$ 11,387,000	[3],[4],[15]
Financial Derivatives - Assets [Member] | Short Credit Default Swap On Asset Backed Securities [Member] | North America [Member] | Mortgage-related Residential [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2034-09	[2],[8],[14]	2034-09	[3],[4],[15]
Financial Derivatives - Assets [Member] | Short Credit Default Swap On Asset Backed Securities [Member] | North America [Member] | Mortgage-related Residential [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2036-05	[2],[8],[14]	2036-05	[3],[4],[15]
Financial Derivatives - Assets [Member] | Short Total Return Swaps [Member] | North America [Member] | Financial [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[8],[18]	Equity Market
Derivative Asset, Notional Amount	[2],[8],[18]	$ (44,359,000)
Range of expiration dates	[2],[8],[18]	2017-03
Derivative Asset	[2],[8],[18]	$ 1,000
Financial Derivatives - Assets [Member] | Swap [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset		$ 88,854,000	[2],[8]	$ 77,795,000	[3],[4]
Investment owned as a percentage of equity		11.44%	[2],[5],[8]	9.87%	[3],[4],[6]
Net cost		$ 86,025,000	[2],[8]	$ 59,299,000	[3],[4]
Financial Derivatives - Assets [Member] | Long US Treasury Note Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Interest Rates	[2],[19]	Interest Rates	[3],[4],[20]
Derivative Asset, Notional Amount		$ 159,700,000	[2],[19]	$ 109,300,000	[3],[4],[20]
Range of expiration dates		2015-09	[2],[19]	2015-03	[3],[4],[20]
Derivative Asset		$ 212,000	[2],[19]	$ 162,000	[3],[4],[20]
Financial Derivatives - Assets [Member] | Long Eurodollar Future [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Interest Rates	[2],[21]	Interest Rates	[3],[4],[22]
Derivative Asset, Notional Amount		$ 23,000,000	[2],[21]	$ 11,000,000	[3],[4],[22]
Range of expiration dates	[3],[4],[22]			2017-06
Derivative Asset		$ 24,000	[2],[21]	$ 7,000	[3],[4],[22]
Financial Derivatives - Assets [Member] | Long Eurodollar Future [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[2],[21]	2015-12
Financial Derivatives - Assets [Member] | Long Eurodollar Future [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[2],[21]	2017-06
Financial Derivatives - Assets [Member] | Short Eurodollar Future [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[3],[4],[22]			Interest Rates
Derivative Asset, Notional Amount	[3],[4],[22]			$ (520,000,000)
Derivative Asset	[3],[4],[22]			$ 92,000
Financial Derivatives - Assets [Member] | Short Eurodollar Future [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[3],[4],[22]			2015-09
Financial Derivatives - Assets [Member] | Short Eurodollar Future [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[3],[4],[22]			2017-09
Financial Derivatives - Assets [Member] | Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset		$ 236,000	[2]	$ 261,000	[3],[4]
Investment owned as a percentage of equity		0.03%	[2],[5]	0.03%	[3],[4],[6]
Financial Derivatives - Assets [Member] | Option on CDS on Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Credit	[2],[23]	Credit	[3],[4],[24]
Derivative Asset, Notional Amount		$ 74,556,000	[2],[23]	$ 364,400,000	[3],[4],[24]
Derivative Asset		$ 564,000	[2],[23]	$ 625,000	[3],[4],[24]
Financial Derivatives - Assets [Member] | Option on CDS on Corporate Bond Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2015-09	[2],[23]	2015-01	[3],[4],[24]
Financial Derivatives - Assets [Member] | Option on CDS on Corporate Bond Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2015-10	[2],[23]	2015-03	[3],[4],[24]
Financial Derivatives - Assets [Member] | Purchased Payer Swaption [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[3],[4],[25]			Interest Rates
Derivative Asset, Notional Amount	[3],[4],[25]			$ 822,800,000
Derivative Asset	[3],[4],[25]			$ 344,000
Financial Derivatives - Assets [Member] | Purchased Payer Swaption [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[3],[4],[25]			2015-01
Financial Derivatives - Assets [Member] | Purchased Payer Swaption [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[3],[4],[25]			2015-06
Financial Derivatives - Assets [Member] | Purchased Options on U.S. Treasury Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[3],[4],[26]			Interest Rates
Derivative Asset, Notional Amount	[3],[4],[26]			$ 11,000,000
Derivative Asset	[3],[4],[26]			$ 20,000
Financial Derivatives - Assets [Member] | Purchased Options on U.S. Treasury Futures [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[3],[4],[26]			2015-02
Financial Derivatives - Assets [Member] | Purchased Options on U.S. Treasury Futures [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[3],[4],[26]			2015-03
Financial Derivatives - Assets [Member] | Purchased receiver swaptions [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[27]	Interest Rates
Derivative Asset, Notional Amount	[2],[27]	$ 29,000,000
Range of expiration dates	[2],[27]	2018-06
Derivative Asset	[2],[27]	$ 710,000
Financial Derivatives - Assets [Member] | Written Straddle Swaption [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[28]	Interest Rates
Derivative Asset, Notional Amount	[2],[28]	$ (14,000,000)
Range of expiration dates	[2],[28]	2016-06
Derivative Asset	[2],[28]	$ 9,000
Financial Derivatives - Assets [Member] | Options [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset		$ 1,283,000	[2]	$ 989,000	[3],[4]
Investment owned as a percentage of equity		0.17%	[2],[5]	0.13%	[3],[4],[6]
Net cost		$ 1,166,000	[2]	$ 2,161,000	[3],[4]
Financial Derivatives - Assets [Member] | Long Currency Forward [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[29]	Currency
Derivative Asset, Notional Amount	[2],[29]	$ 5,192,000
Range of expiration dates	[2],[29]	2015-09
Derivative Asset	[2],[29]	$ 5,000
Financial Derivatives - Assets [Member] | Short Currency Forward [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Currency	[2],[30]	Currency	[3],[4],[31]
Derivative Asset, Notional Amount		$ (104,038,000)	[2],[30]	$ (35,849,000)	[3],[4],[31]
Range of expiration dates		2015-09	[2],[30]	2015-03	[3],[4],[31]
Derivative Asset		$ 1,187,000	[2],[30]	$ 884,000	[3],[4],[31]
Financial Derivatives - Assets [Member] | Forwards [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset		$ 1,192,000	[2]	$ 884,000	[3],[4]
Investment owned as a percentage of equity		0.15%	[2],[5]	0.11%	[3],[4],[6]
Financial Derivatives - Assets [Member] | Warrant [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Asset		$ 100,000	[2]	$ 100,000	[3],[4]
Investment owned as a percentage of equity		0.01%	[2],[5]	0.01%	[3],[4],[6]
Net cost		$ 100,000	[2]	$ 100,000	[3],[4]
Financial Derivatives - Assets [Member] | Warrant [Member] | North America [Member] | Mortgage-related Residential [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Equity Market	[2],[32]	Equity Market	[3],[4],[33]
Derivative Asset, Notional Amount		$ 1,554,000	[2],[32]	$ 1,554,000	[3],[4],[33]
Derivative Asset		100,000	[2],[32]	100,000	[3],[4],[33]
Financial Derivatives - Liabilities [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities		$ (45,565,000)	[2]	$ (66,116,000)	[3],[4]
Investment owned as a percentage of equity		(5.86%)	[2],[5]	(8.39%)	[3],[4],[6]
Net proceeds		$ (35,500,000)	[2]	$ (33,555,000)	[3],[4]
Financial Derivatives - Liabilities [Member] | Affiliates of JP Morgan [Member]
Investment Holdings, Other than Securities [Line Items]
Investment owned as a percentage of equity				(5.18%)
Financial Derivatives - Liabilities [Member] | Long Credit Default Swap On Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[3],[4],[9],[34]			Credit
Derivative Liability, Notional Amount	[3],[4],[9],[34]			$ 3,756,000
Range of expiration dates	[3],[4],[9],[34]			2017-12
Derivative Liabilities	[3],[4],[9],[34]			$ (1,231,000)
Financial Derivatives - Liabilities [Member] | Long Credit Default Swap On Asset Backed Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Credit	[2],[7]	Credit	[3],[4],[9],[34]
Derivative Liability, Notional Amount		$ 59,467,000	[2],[7]	$ 17,113,000	[3],[4],[9],[34]
Derivative Liabilities		$ (6,507,000)	[2],[7]	$ (4,248,000)	[3],[4],[9],[34]
Financial Derivatives - Liabilities [Member] | Long Credit Default Swap On Asset Backed Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2047-01	[2],[7]	2049-03	[3],[4],[9],[34]
Financial Derivatives - Liabilities [Member] | Long Credit Default Swap On Asset Backed Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2063-05	[2],[7]	2052-10	[3],[4],[9],[34]
Financial Derivatives - Liabilities [Member] | Long Interest Rate Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Interest Rates	[2],[10]	Interest Rates	[3],[4],[11],[34]
Derivative Liability, Notional Amount		$ 137,722,000	[2],[10]	$ 230,410,000	[3],[4],[11],[34]
Derivative Liabilities		$ (1,863,000)	[2],[10]	$ (678,000)	[3],[4],[11],[34]
Financial Derivatives - Liabilities [Member] | Long Interest Rate Swaps [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2019-10	[2],[10]	2016-10	[3],[4],[11],[34]
Financial Derivatives - Liabilities [Member] | Long Interest Rate Swaps [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2025-04	[2],[10]	2044-12	[3],[4],[11],[34]
Financial Derivatives - Liabilities [Member] | Long Total Return Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities	[2]	$ (1,905,000)
Financial Derivatives - Liabilities [Member] | Long Total Return Swaps [Member] | North America [Member] | Financial [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Equity Market	[2],[18]	Equity Market	[3],[4],[12],[34]
Derivative Liability, Notional Amount		$ 54,960,000	[2],[18]	$ 72,075,000	[3],[4],[12],[34]
Derivative Liabilities		$ (2,000)	[2],[18]	$ (21,000)	[3],[4],[12],[34]
Financial Derivatives - Liabilities [Member] | Long Total Return Swaps [Member] | North America [Member] | Financial [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2016-11	[2],[18]	2015-01	[3],[4],[12],[34]
Financial Derivatives - Liabilities [Member] | Long Total Return Swaps [Member] | North America [Member] | Financial [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2017-04	[2],[18]	2016-11	[3],[4],[12],[34]
Financial Derivatives - Liabilities [Member] | Long Total Return Swaps [Member] | North America [Member] | Basic Materials [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[13]	Credit
Derivative Liability, Notional Amount	[2],[13]	$ 6,509,000
Range of expiration dates	[2],[13]	2016-03
Derivative Liabilities	[2],[13]	$ (260,000)
Financial Derivatives - Liabilities [Member] | Long Total Return Swaps [Member] | North America [Member] | Communications [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[13]	Credit
Derivative Liability, Notional Amount	[2],[13]	$ 8,060,000
Derivative Liabilities	[2],[13]	$ (1,479,000)
Financial Derivatives - Liabilities [Member] | Long Total Return Swaps [Member] | North America [Member] | Communications [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[2],[13]	2016-03
Financial Derivatives - Liabilities [Member] | Long Total Return Swaps [Member] | North America [Member] | Communications [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[2],[13]	2016-05
Financial Derivatives - Liabilities [Member] | Long Total Return Swaps [Member] | North America [Member] | Energy [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[13]	Credit
Derivative Liability, Notional Amount	[2],[13]	$ 5,752,000
Derivative Liabilities	[2],[13]	$ (164,000)
Financial Derivatives - Liabilities [Member] | Long Total Return Swaps [Member] | North America [Member] | Energy [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[2],[13]	2016-04
Financial Derivatives - Liabilities [Member] | Long Total Return Swaps [Member] | North America [Member] | Energy [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[2],[13]	2016-06
Financial Derivatives - Liabilities [Member] | Short Credit Default Swap On Asset Backed Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[3],[4],[15],[34]			Credit
Derivative Liability, Notional Amount	[3],[4],[15],[34]			$ (20,050,000)
Range of expiration dates	[3],[4],[15],[34]			2063-05
Derivative Liabilities	[3],[4],[15],[34]			$ (162,000)
Financial Derivatives - Liabilities [Member] | Short Interest Rate Swaps [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Interest Rates	[2],[16]	Interest Rates	[3],[4],[17],[34]
Derivative Liability, Notional Amount		$ (646,784,000)	[2],[16]	$ (1,024,716,000)	[3],[4],[17],[34]
Derivative Liabilities		$ (7,440,000)	[2],[16]	$ (28,727,000)	[3],[4],[17],[34]
Financial Derivatives - Liabilities [Member] | Short Interest Rate Swaps [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2016-01	[2],[16]	2015-03	[3],[4],[17],[34]
Financial Derivatives - Liabilities [Member] | Short Interest Rate Swaps [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2044-11	[2],[16]	2044-11	[3],[4],[17],[34]
Financial Derivatives - Liabilities [Member] | Short Credit Default Swap On Asset Backed Securities [Member] | North America [Member] | Mortgage-related Residential [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Credit	[2],[14]	Credit	[3],[4],[15],[34]
Derivative Liability, Notional Amount		$ (3,237,000)	[2],[14]	$ (3,000,000)	[3],[4],[15],[34]
Range of expiration dates	[3],[4],[15],[34]			2035-03
Derivative Liabilities		$ (280,000)	[2],[14]	$ (239,000)	[3],[4],[15],[34]
Financial Derivatives - Liabilities [Member] | Short Credit Default Swap On Asset Backed Securities [Member] | North America [Member] | Mortgage-related Residential [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[2],[14]	2034-10
Financial Derivatives - Liabilities [Member] | Short Credit Default Swap On Asset Backed Securities [Member] | North America [Member] | Mortgage-related Residential [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[2],[14]	2035-03
Financial Derivatives - Liabilities [Member] | Long Credit Default Swap On Corporate Bonds [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities	[3],[4],[9],[34]			$ (2,706,000)
Financial Derivatives - Liabilities [Member] | Long Credit Default Swap On Corporate Bonds [Member] | North America [Member] | Communications [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[3],[4],[9],[34]			Credit
Derivative Liability, Notional Amount	[3],[4],[9],[34]			$ 500,000
Range of expiration dates	[3],[4],[9],[34]			2019-09
Derivative Liabilities	[3],[4],[9],[34]			$ (172,000)
Financial Derivatives - Liabilities [Member] | Long Credit Default Swap On Corporate Bonds [Member] | North America [Member] | Consumer [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[3],[4],[9],[34]			Credit
Derivative Liability, Notional Amount	[3],[4],[9],[34]			$ 3,498,000
Range of expiration dates	[3],[4],[9],[34]			2019-06
Derivative Liabilities	[3],[4],[9],[34]			$ (2,283,000)
Financial Derivatives - Liabilities [Member] | Long Credit Default Swap On Corporate Bonds [Member] | North America [Member] | Energy [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[3],[4],[9],[34]			Credit
Derivative Liability, Notional Amount	[3],[4],[9],[34]			$ 430,000
Range of expiration dates	[3],[4],[9],[34]			2019-12
Derivative Liabilities	[3],[4],[9],[34]			$ (251,000)
Financial Derivatives - Liabilities [Member] | Short Credit Default Swaps On Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Credit	[2],[14]	Credit	[3],[4],[15],[34]
Derivative Liability, Notional Amount		$ (315,202,000)	[2],[14]	$ (352,945,000)	[3],[4],[15],[34]
Derivative Liabilities		$ (24,400,000)	[2],[14]	$ (27,357,000)	[3],[4],[15],[34]
Financial Derivatives - Liabilities [Member] | Short Credit Default Swaps On Corporate Bond Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2016-12	[2],[14]	2016-12	[3],[4],[15],[34]
Financial Derivatives - Liabilities [Member] | Short Credit Default Swaps On Corporate Bond Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2020-06	[2],[14]	2019-12	[3],[4],[15],[34]
Financial Derivatives - Liabilities [Member] | Short Credit Default Swaps on Corporate Bonds [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities	[2]	$ (320,000)
Financial Derivatives - Liabilities [Member] | Short Credit Default Swaps on Corporate Bonds [Member] | North America [Member] | Financial [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[14]	Credit
Derivative Liability, Notional Amount	[2],[14]	$ (4,000,000)
Range of expiration dates	[2],[14]	2020-03
Derivative Liabilities	[2],[14]	$ (81,000)
Financial Derivatives - Liabilities [Member] | Short Credit Default Swaps on Corporate Bonds [Member] | North America [Member] | Consumer [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Credit	[2],[14]	Credit	[3],[4],[15],[34]
Derivative Liability, Notional Amount		$ (5,970,000)	[2],[14]	$ (5,970,000)	[3],[4],[15],[34]
Derivative Liabilities		$ (239,000)	[2],[14]	$ (247,000)	[3],[4],[15],[34]
Financial Derivatives - Liabilities [Member] | Short Credit Default Swaps on Corporate Bonds [Member] | North America [Member] | Consumer [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2019-09	[2],[14]	2019-09	[3],[4],[15],[34]
Financial Derivatives - Liabilities [Member] | Short Credit Default Swaps on Corporate Bonds [Member] | North America [Member] | Consumer [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2019-12	[2],[14]	2019-12	[3],[4],[15],[34]
Financial Derivatives - Liabilities [Member] | Short Total Return Swaps [Member] | North America [Member] | Financial [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[18]	Equity Market
Derivative Liability, Notional Amount	[2],[18]	$ (33,349,000)
Range of expiration dates	[2],[18]	2017-03
Derivative Liabilities	[2],[18]	$ (14,000)
Financial Derivatives - Liabilities [Member] | Short Total Return Swaps [Member] | North America [Member] | Energy [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[18]	Equity Market
Derivative Liability, Notional Amount	[2],[18]	$ (1,290,000)
Derivative Liabilities	[2],[18]	$ 0
Financial Derivatives - Liabilities [Member] | Short Total Return Swaps [Member] | North America [Member] | Energy [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[2],[18]	2017-03
Financial Derivatives - Liabilities [Member] | Short Total Return Swaps [Member] | North America [Member] | Energy [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[2],[18]	2017-06
Financial Derivatives - Liabilities [Member] | Swap [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities		$ (42,729,000)	[2]	$ (65,616,000)	[3],[4],[34]
Investment owned as a percentage of equity		(5.50%)	[2],[5]	(8.32%)	[3],[4],[6],[34]
Net proceeds		$ (31,972,000)	[2]	$ (33,400,000)	[3],[4],[34]
Financial Derivatives - Liabilities [Member] | Long US Treasury Note Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Interest Rates	[2],[19]	Interest Rates	[3],[4],[20]
Derivative Liability, Notional Amount		$ 44,600,000	[2],[19]	$ 50,600,000	[3],[4],[20]
Range of expiration dates		2015-09	[2],[19]	2015-03	[3],[4],[20]
Derivative Liabilities		$ (166,000)	[2],[19]	$ (13,000)	[3],[4],[20]
Financial Derivatives - Liabilities [Member] | Long Index Future [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[35]	Credit
Derivative Liability, Notional Amount	[2],[35]	$ 8,321,000
Range of expiration dates	[2],[35]	2015-09
Derivative Liabilities	[2],[35]	$ (10,000)
Financial Derivatives - Liabilities [Member] | Short Eurodollar Future [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Interest Rates	[2],[21]	Interest Rates	[3],[4],[22]
Derivative Liability, Notional Amount		$ (644,000,000)	[2],[21]	$ (179,000,000)	[3],[4],[22]
Derivative Liabilities		$ (457,000)	[2],[21]	$ (68,000)	[3],[4],[22]
Financial Derivatives - Liabilities [Member] | Short Eurodollar Future [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2015-09	[2],[21]	2015-03	[3],[4],[22]
Financial Derivatives - Liabilities [Member] | Short Eurodollar Future [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates		2017-09	[2],[21]	2015-06	[3],[4],[22]
Financial Derivatives - Liabilities [Member] | Futures [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities		$ (633,000)	[2]	$ (81,000)	[3],[4]
Investment owned as a percentage of equity		(0.08%)	[2],[5]	(0.01%)	[3],[4],[6]
Financial Derivatives - Liabilities [Member] | Option on CDS on Corporate Bond Indices [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Credit	[2],[36]	Credit	[3],[4],[37]
Derivative Liability, Notional Amount		$ (518,680,000)	[2],[36]	$ (25,900,000)	[3],[4],[37]
Range of expiration dates	[3],[4],[37]			2018-03
Derivative Liabilities		$ (1,334,000)	[2],[36]	$ (146,000)	[3],[4],[37]
Financial Derivatives - Liabilities [Member] | Option on CDS on Corporate Bond Indices [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[2],[36]	2015-08
Financial Derivatives - Liabilities [Member] | Option on CDS on Corporate Bond Indices [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[2],[36]	2015-10
Financial Derivatives - Liabilities [Member] | Written Payer Swaption [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[3],[4],[38]			Interest Rates
Derivative Liability, Notional Amount	[3],[4],[38]			$ (10,200,000)
Range of expiration dates	[3],[4],[38]			2015-01
Derivative Liabilities	[3],[4],[38]			$ 0
Financial Derivatives - Liabilities [Member] | Purchased Payer Swaption [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Interest Rates	[2],[39]	Interest Rates	[3],[4],[25]
Derivative Liability, Notional Amount		$ 126,000,000	[2],[39]	$ 260,000,000	[3],[4],[25]
Range of expiration dates		2016-06	[2],[39]	2015-03	[3],[4],[25]
Derivative Liabilities		$ (40,000)	[2],[39]	$ (137,000)	[3],[4],[25]
Financial Derivatives - Liabilities [Member] | Purchased Straddle Swaption [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[28]	Interest Rates
Derivative Liability, Notional Amount	[2],[28]	$ 22,000,000
Range of expiration dates	[2],[28]	2018-06
Derivative Liabilities	[2],[28]	$ (30,000)
Financial Derivatives - Liabilities [Member] | Written receiver swaptions [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[40]	Interest Rates
Derivative Liability, Notional Amount	[2],[40]	$ (13,000,000)
Range of expiration dates	[2],[40]	2018-06
Derivative Liabilities	[2],[40]	$ (594,000)
Financial Derivatives - Liabilities [Member] | Options [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities		$ (1,998,000)	[2]	$ (283,000)	[3],[4]
Investment owned as a percentage of equity		(0.25%)	[2],[5]	(0.04%)	[3],[4],[6]
Net proceeds		$ (3,528,000)	[2]	$ (155,000)	[3],[4]
Financial Derivatives - Liabilities [Member] | Long Currency Forward [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Currency	[2],[29]	Currency	[3],[4],[41]
Derivative Liability, Notional Amount		$ 8,664,000	[2],[29]	$ 9,518,000	[3],[4],[41]
Range of expiration dates		2015-09	[2],[29]	2015-03	[3],[4],[41]
Derivative Liabilities		$ (131,000)	[2],[29]	$ (136,000)	[3],[4],[41]
Financial Derivatives - Liabilities [Member] | Short Currency Forward [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure		Currency	[2],[30]	Currency	[3],[4],[31]
Derivative Liability, Notional Amount		$ (10,162,000)	[2],[30]	$ (117,000)	[3],[4],[31]
Range of expiration dates		2015-09	[2],[30]	2015-03	[3],[4],[31]
Derivative Liabilities		$ (74,000)	[2],[30]	$ 0	[3],[4],[31]
Financial Derivatives - Liabilities [Member] | Forwards [Member]
Investment Holdings, Other than Securities [Line Items]
Derivative Liabilities		$ (205,000)	[2]	$ (136,000)	[3],[4]
Investment owned as a percentage of equity		(0.03%)	[2],[5]	(0.02%)	[3],[4],[6]
Financial Derivatives - Liabilities [Member] | Loan Purchase Commitments [Member]
Investment Holdings, Other than Securities [Line Items]
Primary risk exposure	[2],[42]	Interest Rates
Derivative Liability, Notional Amount	[2],[42]	$ 1,680,000
Derivative Liabilities	[2],[42]	$ 0
Investment owned as a percentage of equity	[2],[5]	0.00%
Financial Derivatives - Liabilities [Member] | Loan Purchase Commitments [Member] | Minimum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[2],[42]	2015-07
Financial Derivatives - Liabilities [Member] | Loan Purchase Commitments [Member] | Maximum [Member]
Investment Holdings, Other than Securities [Line Items]
Range of expiration dates	[2],[42]	2015-08

[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] Conformed to current period presentation.

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

[5] Classification percentages are based on Total Equity.

[6] Classification percentages are based on Total Equity.

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

[8] The following table shows the Company's swap assets by dealer as a percentage of Total Equity:Dealer/Parent Company Asset/Liability Percent of EquityAffiliates of Bank of America Financial derivatives—asset 5.40%

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

[10] For long interest rate swap contracts, a floating rate is being paid and a fixed rate is being received.

[11] For long interest rate swap contracts, a floating rate is being paid and a fixed rate is being received.

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

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

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

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

[16] For short interest rate swap contracts, a fixed rate is being paid and a floating rate is being received.

[17] For short interest rate swap contracts, a fixed rate is being paid and a floating rate is being received.

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

[19] Notional value represents the total face amount of U.S. Treasury Notes underlying all contracts held; as of June 30, 2015, 1,644 contracts were held.

[20] Notional value represents the total face amount of U.S. Treasury Notes underlying all contracts held; as of December 31, 2014, 1,346 contracts were held.

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

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

[23] 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.

[24] 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.

[25] Represents the option on the part of the Company to enter into an interest rate swap whereby the Company would pay a fixed rate and receive a floating rate.

[26] Represents the option on the part of the Company to enter into a futures contract with a counterparty; as of December 31, 2014, 110 contracts were held.

[27] Represents the option on the part of the Company to enter into an interest rate swap whereby the Company would pay a floating rate and receive a fixed rate.

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

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

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

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

[32] Notional amount represents number of warrants.

[33] Notional amount represents number of warrants.

[34] The following table shows the Company's swap liabilities by dealer as a percentage of Total Equity:Dealer/Parent Company Percent of EquityAffiliates of JP Morgan (5.18)%

[35] Notional value represents the number of contracts held times 50 times the Index price at June 30, 2015; as of June 30, 2015, 81 contracts were held.

[36] 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.

[37] 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.

[38] Represents the option on the part of a counterparty to enter into an interest rate swap with the Company whereby the Company would receive a fixed rate and pay a floating rate.

[39] Represents the option on the part of the Company to enter into an interest rate swap whereby the Company would pay a fixed rate and receive a floating rate.

[40] Represents the option on the part of a counterparty to enter into an interest rate swap with the Company whereby the Company would pay a fixed rate and receive a floating rate.

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

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