Consolidated Condensed Schedule Of Investments (Investments Sold Short) - USD ($) shares in Thousands, $ in Thousands		9 Months Ended		12 Months Ended
		Sep. 30, 2016		Dec. 31, 2015
Investments Sold, Not yet Purchased [Line Items]
Investments sold short, at fair value-		$ (679,021)		$ (728,747)
Proceeds from investments sold short		$ (677,286)		$ (731,048)
TBA - Fixed Rate Agency Securities Sold Short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(76.98%)	[1],[2],[3]	(82.93%)	[4],[5],[6]
Current Principal/Notional Amount		$ (478,255)		$ (580,992)
Investments sold short, at fair value-		(511,754)	[1],[3]	(612,777)	[4],[6]
Proceeds from investments sold short		$ (511,170)	[1],[3]	$ (612,749)	[4],[6]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(41.86%)		(57.51%)
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(20.51%)		(23.25%)
TBA - Fixed Rate Agency Securities Sold Short [Member] | Government National Mortgage Association [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(14.61%)		(2.17%)
Government debt sold short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(14.84%)	[2],[3]	(15.43%)	[5],[6]
Investments sold short, at fair value-		$ (98,604)	[3]	$ (114,051)	[6]
Proceeds from investments sold short		$ (98,222)	[3]	$ (115,745)	[6]
Common Stock Sold Short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(4.43%)	[2],[3]	(0.20%)	[5],[6]
Investments sold short, at fair value-		$ (29,476)	[3]	$ (1,471)	[6]
Proceeds from investments sold short		$ (29,044)	[3]	$ (1,878)	[6]
Corporate Debt Sold Short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(5.90%)	[2],[3]	(0.06%)	[5],[6]
Investments sold short, at fair value-		$ (39,187)	[3]	$ (448)	[6]
Proceeds from investments sold short		$ (38,850)	[3]	$ (676)	[6]
Securities Sold Short - Securities Sold, Not Yet Purchased [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(102.15%)	[2],[3]	(98.62%)	[5],[6]
Investments sold short, at fair value-		$ (679,021)	[3]	$ (728,747)	[6]
Proceeds from investments sold short		$ (677,286)	[3]	$ (731,048)	[6]
North America [Member] | Government debt sold short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(6.26%)	[2],[3]	(12.11%)	[5],[6]
Investments sold short, at fair value-		$ (41,585)	[3]	$ (89,489)	[6]
Proceeds from investments sold short		$ (41,199)	[3]	$ (89,735)	[6]
Europe [Member] | Government debt sold short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity		(8.58%)	[2],[3]	(3.32%)	[5],[6]
Investments sold short, at fair value-		$ (57,019)	[3]	$ (24,562)	[6]
Proceeds from investments sold short		(57,023)	[3]	(26,010)	[6]
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 4.00% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (78,617)	[1],[3]	$ (110,327)	[4],[6]
Rate		4.00%	[1],[3]	4.00%	[4],[6]
Investments maturity date		2016-11	[1],[3]	2016-01	[4],[6]
Investments sold short, at fair value-		$ (84,243)	[1],[3]	$ (116,593)	[4],[6]
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Government National Mortgage Association (30 Year) 3.50% 201610 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[1],[3]	$ (68,630)
Rate	[1],[3]	3.50%
Investments maturity date	[1],[3]	2016-10
Investments sold short, at fair value-	[1],[3]	$ (72,931)
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 3.50% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (51,350)	[1],[3]	$ (69,760)	[4],[6]
Rate		3.50%	[1],[3]	3.50%	[4],[6]
Investments maturity date		2016-11	[1],[3]	2016-01	[4],[6]
Investments sold short, at fair value-		$ (54,108)	[1],[3]	$ (73,054)	[4],[6]
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 4.00% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (46,000)	[1],[3]	$ (48,200)	[4],[6]
Rate		4.00%	[1],[3]	4.00%	[4],[6]
Investments maturity date		2016-11	[1],[3]	2016-02	[4],[6]
Investments sold short, at fair value-		$ (49,346)	[1],[3]	$ (50,911)	[4],[6]
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 3.00% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (42,292)	[1],[3]	$ (23,600)	[4],[6]
Rate		3.00%	[1],[3]	3.00%	[4],[6]
Investments maturity date		2016-10	[1],[3]	2016-02	[4],[6]
Investments sold short, at fair value-		$ (43,965)	[1],[3]	$ (23,555)	[4],[6]
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 5.00% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (31,620)	[1],[3]	$ (51,970)	[4],[6]
Rate		5.00%	[1],[3]	5.00%	[4],[6]
Investments maturity date		2016-11	[1],[3]	2016-01	[4],[6]
Investments sold short, at fair value-		$ (35,107)	[1],[3]	$ (57,214)	[4],[6]
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 4.50% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (28,000)	[1],[3]	$ (79,210)	[4],[6]
Rate		4.50%	[1],[3]	4.50%	[4],[6]
Investments maturity date		2016-11	[1],[3]	2016-01	[4],[6]
Investments sold short, at fair value-		$ (30,635)	[1],[3]	$ (85,553)	[4],[6]
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 year) 3.50% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (28,000)	[1],[3]	$ (43,842)	[4],[6]
Rate		3.50%	[1],[3]	3.50%	[4],[6]
Investments maturity date		2016-11	[1],[3]	2016-01	[4],[6]
Investments sold short, at fair value-		$ (29,516)	[1],[3]	$ (45,233)	[4],[6]
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 4.50% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (23,151)	[1],[3]	$ (21,881)	[4],[6]
Rate		4.50%	[1],[3]	4.50%	[4],[6]
Investments maturity date		2016-11	[1],[3]	2016-01	[4],[6]
Investments sold short, at fair value-		$ (25,328)	[1],[3]	$ (23,577)	[4],[6]
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Government National Mortgage Association (30 Year) 4.50% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[1],[3]	$ (15,770)
Rate	[1],[3]	4.50%
Investments maturity date	[1],[3]	2016-10
Investments sold short, at fair value-	[1],[3]	$ (17,411)
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 4.50% 201610 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[1],[3]	$ (14,930)
Rate	[1],[3]	4.50%
Investments maturity date	[1],[3]	2016-10
Investments sold short, at fair value-	[1],[3]	$ (16,351)
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (15 Year) 3.00% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (13,510)	[1],[3]	$ (16,510)	[4],[6]
Rate		3.00%	[1],[3]	3.00%	[4],[6]
Investments maturity date		2016-10	[1],[3]	2016-01	[4],[6]
Investments sold short, at fair value-		$ (14,192)	[1],[3]	$ (17,018)	[4],[6]
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 4.00% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (11,170)	[1],[3]	$ (11,170)	[4],[6]
Rate		4.00%	[1],[3]	4.00%	[4],[6]
Investments maturity date		2016-10	[1],[3]	2016-01	[4],[6]
Investments sold short, at fair value-		$ (11,545)	[1],[3]	$ (11,629)	[4],[6]
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (15 Year) 3.50% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (8,790)	[1],[3]	$ (13,980)	[4],[6]
Rate		3.50%	[1],[3]	3.50%	[4],[6]
Investments maturity date		2016-10	[1],[3]	2016-01	[4],[6]
Investments sold short, at fair value-		$ (9,288)	[1],[3]	$ (14,618)	[4],[6]
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 5.50% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (6,860)	[1],[3]	$ (6,860)	[4],[6]
Rate		5.50%	[1],[3]	5.50%	[4],[6]
Investments maturity date		2016-10	[1],[3]	2016-01	[4],[6]
Investments sold short, at fair value-		$ (7,731)	[1],[3]	$ (7,646)	[4],[6]
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Government National Mortgage Association (30 Year) 3.50% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (4,000)	[1],[3]	$ (5,050)	[4],[6]
Rate		3.50%	[1],[3]	3.50%	[4],[6]
Investments maturity date		2016-11	[1],[3]	2016-01	[4],[6]
Investments sold short, at fair value-		$ (4,245)	[1],[3]	$ (5,267)	[4],[6]
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 3.00% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[1],[3]	$ (3,155)
Rate	[1],[3]	3.00%
Investments maturity date	[1],[3]	2016-10
Investments sold short, at fair value-	[1],[3]	$ (3,280)
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Government National Mortgage Association (30 Year) 3.00% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[1],[3]	$ (2,100)
Rate	[1],[3]	3.00%
Investments maturity date	[1],[3]	2016-10
Investments sold short, at fair value-	[1],[3]	$ (2,200)
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Government National Mortgage Association (30 Year) 4.00% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (310)	[1],[3]	$ (10,150)	[4],[6]
Rate		4.00%	[1],[3]	4.00%	[4],[6]
Investments maturity date		2016-10	[1],[3]	2016-01	[4],[6]
Investments sold short, at fair value-		$ (332)	[1],[3]	$ (10,782)	[4],[6]
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 3.00% [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[4],[6]			$ (37,140)
Rate	[4],[6]			3.00%
Investments maturity date	[4],[6]			2016-01
Investments sold short, at fair value-	[4],[6]			$ (38,264)
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 3.50% 201602 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[4],[6]			$ (17,600)
Rate	[4],[6]			3.50%
Investments maturity date	[4],[6]			2016-02
Investments sold short, at fair value-	[4],[6]			$ (18,120)
Mortgage-related Residential [Member] | North America [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 3.00% 2016-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[4],[6]			$ (13,742)
Rate	[4],[6]			3.00%
Investments maturity date	[4],[6]			2016-01
Investments sold short, at fair value-	[4],[6]			$ (13,743)
Government [Member] | North America [Member] | Government debt sold short [Member] | US Treasury Note, 1.50 Percent, Maturity Date 2026 08 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (8,020)
Rate	[3]	1.50%
Investments maturity date	[3]	2026-08
Investments sold short, at fair value-	[3]	$ (7,942)
Government [Member] | North America [Member] | Government debt sold short [Member] | US Treasury Note, 1.13 Percent, Maturity Date 2021 08 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (6,060)
Rate	[3]	1.13%
Investments maturity date	[3]	2021-08
Investments sold short, at fair value-	[3]	$ (6,055)
Government [Member] | North America [Member] | Government debt sold short [Member] | US Treasury Note, 1.13 Percent, Maturity Date 2021 09 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (5,630)
Rate	[3]	1.13%
Investments maturity date	[3]	2021-09
Investments sold short, at fair value-	[3]	$ (5,622)
Government [Member] | North America [Member] | Government debt sold short [Member] | US Treasury Note, 1.50 Percent, Maturity Date 2020 05 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (4,000)
Rate	[3]	1.50%
Investments maturity date	[3]	2020-05
Investments sold short, at fair value-	[3]	$ (4,070)
Government [Member] | North America [Member] | Government debt sold short [Member] | US Treasury Bond Securities [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (3,630)
Rate	[3]	2.25%
Investments maturity date	[3]	2046-08
Investments sold short, at fair value-	[3]	$ (3,564)
Government [Member] | North America [Member] | Government debt sold short [Member] | US Treasury Note, 1.63 Percent, Maturity Date 2020 11 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (3,400)
Rate	[3]	1.63%
Investments maturity date	[3]	2020-11
Investments sold short, at fair value-	[3]	$ (3,475)
Government [Member] | North America [Member] | Government debt sold short [Member] | US Treasury Note, 1.38 Percent, Maturity Date 2021 04 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (2,071)
Rate	[3]	1.38%
Investments maturity date	[3]	2021-04
Investments sold short, at fair value-	[3]	$ (2,093)
Government [Member] | North America [Member] | Government debt sold short [Member] | US Treasury Note, 2.00 Percent, Maturity Date 2022 07 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (2,000)
Rate	[3]	2.00%
Investments maturity date	[3]	2022-07
Investments sold short, at fair value-	[3]	$ (2,079)
Government [Member] | North America [Member] | Government debt sold short [Member] | US Treasury Note, 1.25 Percent, Maturity Date 2020 01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (2,000)
Rate	[3]	1.25%
Investments maturity date	[3]	2020-01
Investments sold short, at fair value-	[3]	$ (2,019)
Government [Member] | North America [Member] | Government debt sold short [Member] | US Treasury Note, 1.63 Percent, Maturity Date 2020 06 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (1,695)
Rate	[3]	1.63%
Investments maturity date	[3]	2020-06
Investments sold short, at fair value-	[3]	$ (1,732)
Government [Member] | North America [Member] | Government debt sold short [Member] | US Treasury Note, 1.13 Percent, Maturity Date 2021 02 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (1,314)
Rate	[3]	1.13%
Investments maturity date	[3]	2021-02
Investments sold short, at fair value-	[3]	$ (1,315)
Government [Member] | North America [Member] | Government debt sold short [Member] | US Treasury Note, 0.75 Percent, Maturity Date 2019 08 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (1,200)
Rate	[3]	0.75%
Investments maturity date	[3]	2019-08
Investments sold short, at fair value-	[3]	$ (1,196)
Government [Member] | North America [Member] | Government debt sold short [Member] | US Treasury Note, 1.38 Percent, Maturity Date 2020 03 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (417)
Rate	[3]	1.38%
Investments maturity date	[3]	2020-03
Investments sold short, at fair value-	[3]	$ (423)
Government [Member] | North America [Member] | Government debt sold short [Member] | US Treasury Notes Securities [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[6]			(90,120)
Investments sold short, at fair value-	[6]			$ (89,489)
Government [Member] | North America [Member] | Government debt sold short [Member] | Minimum [Member] | US Treasury Notes Securities [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	[6]			1.25%
Investments maturity date	[6]			2018-10
Government [Member] | North America [Member] | Government debt sold short [Member] | Maximum [Member] | US Treasury Notes Securities [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	[6]			2.25%
Investments maturity date	[6]			2025-08
Government [Member] | Europe [Member] | Government debt sold short [Member] | Sovereign Debt Securities [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (22,113)	[3]	$ (23,907)	[6]
Investments maturity date	[3]	2020-11
Investments sold short, at fair value-		$ (22,721)	[3]	$ (24,562)	[6]
Government [Member] | Europe [Member] | Government debt sold short [Member] | Spanish Sovereign Bond, 0.25 Percent [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (15,457)
Rate	[3]	0.25%
Investments maturity date	[3]	2018-04
Investments sold short, at fair value-	[3]	$ (15,572)
Government [Member] | Europe [Member] | Government debt sold short [Member] | Spanish Sovereign Bond, 2.75 Percent [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (8,867)
Rate	[3]	2.75%
Investments maturity date	[3]	2019-04
Investments sold short, at fair value-	[3]	$ (9,526)
Government [Member] | Europe [Member] | Government debt sold short [Member] | Spanish Sovereign Bond, 1.15 Percent [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (8,797)
Rate	[3]	1.15%
Investments maturity date	[3]	2020-07
Investments sold short, at fair value-	[3]	$ (9,200)
Government [Member] | Europe [Member] | Government debt sold short [Member] | Minimum [Member] | Sovereign Debt Securities [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate		0.25%	[3]	0.25%	[6]
Investments maturity date	[6]			2016-09
Government [Member] | Europe [Member] | Government debt sold short [Member] | Maximum [Member] | Sovereign Debt Securities [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate		0.65%	[3]	4.00%	[6]
Investments maturity date	[6]			2019-04
Basic Materials [Member] | North America [Member] | Corporate Debt Sold Short [Member] | Various Issuer [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (6,100)
Investments sold short, at fair value-	[3]	$ (5,793)
Basic Materials [Member] | North America [Member] | Corporate Debt Sold Short [Member] | Minimum [Member] | Various Issuer [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	[3]	3.55%
Investments maturity date	[3]	2021-10
Basic Materials [Member] | North America [Member] | Corporate Debt Sold Short [Member] | Maximum [Member] | Various Issuer [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	[3]	5.13%
Investments maturity date	[3]	2022-03
Communications [Member] | North America [Member] | Corporate Debt Sold Short [Member] | Various Issuer [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (9,800)
Investments sold short, at fair value-	[3]	$ (10,019)
Communications [Member] | North America [Member] | Corporate Debt Sold Short [Member] | Minimum [Member] | Various Issuer [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	[3]	5.25%
Investments maturity date	[3]	2021-09
Communications [Member] | North America [Member] | Corporate Debt Sold Short [Member] | Maximum [Member] | Various Issuer [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	[3]	6.73%
Investments maturity date	[3]	2022-10
Consumer [Member] | North America [Member] | Corporate Debt Sold Short [Member] | Various Issuer [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (11,070)
Investments sold short, at fair value-	[3]	$ (11,556)
Consumer [Member] | North America [Member] | Corporate Debt Sold Short [Member] | Minimum [Member] | Various Issuer [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	[3]	3.88%
Investments maturity date	[3]	2022-01
Consumer [Member] | North America [Member] | Corporate Debt Sold Short [Member] | Maximum [Member] | Various Issuer [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	[3]	6.25%
Investments maturity date	[3]	2024-10
Energy [Member] | North America [Member] | Common Stock Sold Short [Member] | Exchange Traded Equity [Member]
Investments Sold, Not yet Purchased [Line Items]
Investments sold short, at fair value-	[6]			$ (1,471)
Investment Sold, Not yet Purchased, Balance, Shares	[6]			(306)
Energy [Member] | North America [Member] | Corporate Debt Sold Short [Member] | Various Issuer [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount		$ (8,677)	[3]	$ (1,120)	[6]
Investments sold short, at fair value-		$ (8,082)	[3]	$ (448)	[6]
Energy [Member] | North America [Member] | Corporate Debt Sold Short [Member] | Minimum [Member] | Various Issuer [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate		2.40%	[3]	10.00%	[6]
Investments maturity date		2021-06	[3]	2020-03	[6]
Energy [Member] | North America [Member] | Corporate Debt Sold Short [Member] | Maximum [Member] | Various Issuer [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate		7.75%	[3]	11.00%	[6]
Investments maturity date		2024-11	[3]	2020-06	[6]
Financial [Member] | North America [Member] | Common Stock Sold Short [Member] | Exchange Traded Equity [Member]
Investments Sold, Not yet Purchased [Line Items]
Investments sold short, at fair value-	[3]	$ (27,669)
Investment Sold, Not yet Purchased, Balance, Shares	[3]	(317)
Financial [Member] | North America [Member] | Common Stock Sold Short [Member] | Publicly Traded Real Estate Investment Trusts [Member]
Investments Sold, Not yet Purchased [Line Items]
Investments sold short, at fair value-	[3]	$ (1,807)
Investment Sold, Not yet Purchased, Balance, Shares	[3]	(312)
Utilities [Member] | North America [Member] | Corporate Debt Sold Short [Member] | Various Issuer [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	[3]	$ (3,670)
Investments sold short, at fair value-	[3]	$ (3,737)
Utilities [Member] | North America [Member] | Corporate Debt Sold Short [Member] | Minimum [Member] | Various Issuer [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	[3]	5.50%
Investments maturity date	[3]	2022-07
Utilities [Member] | North America [Member] | Corporate Debt Sold Short [Member] | Maximum [Member] | Various Issuer [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	[3]	6.25%
Investments maturity date	[3]	2024-02

[1] At September 30, 2016, the Company's short investments guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, and the Government National Mortgage Association, represented 41.86%, 20.51%, and 14.61% of equity, respectively.

[2] Classification percentages are based on Total Equity.

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

[4] At December 31, 2015, the Company's short investments guaranteed by the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation, and the Government National Mortgage Association, represented 57.51%, 23.25%, and 2.17% of equity, respectively.

[5] Classification percentages are based on Total Equity.

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