Consolidated Condensed Schedule Of Investments (Investments Sold Short) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Investments Sold, Not yet Purchased [Line Items]
Investments sold short, at fair value-	$ (845,614)		$ (622,301)
Proceeds from investments sold short	(847,602)		(621,048)
Fair Value	1,730,130		1,375,116
TBA - Fixed Rate Agency Securities Sold Short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity	(129.69%)	[1],[2],[3],[4]	(120.22%)	[1],[2],[5]
Investments sold short, at fair value-	(811,957)	[2],[3],[4]	(608,720)	[2],[5]
Proceeds from investments sold short	(813,757)	[2],[3],[4]	(607,967)	[2],[5]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 year) 4.00% 2014-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(156,890)	[2],[3],[4]
Description	Federal National Mortgage Association (30 year)	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Investments maturity date	2014-01	[2],[3],[4]
Investments sold short, at fair value-	(161,689)	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 year) 3.50% 2014-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(136,182)	[2],[3],[4]
Description	Federal National Mortgage Association (30 year)	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Investments maturity date	2014-01	[2],[3],[4]
Investments sold short, at fair value-	(135,427)	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 year) 4.50% 2014-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(96,700)	[2],[3],[4]
Description	Federal National Mortgage Association (30 year)	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Investments maturity date	2014-01	[2],[3],[4]
Investments sold short, at fair value-	(102,559)	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 year) 3.50% 2014-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(89,600)	[2],[3],[4]
Description	Federal National Mortgage Association (15 year)	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Investments maturity date	2014-01	[2],[3],[4]
Investments sold short, at fair value-	(93,716)	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 year) 5.00% 2014-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(57,600)	[2],[3],[4]
Description	Federal National Mortgage Association (30 year)	[2],[3],[4]
Rate	5.00%	[2],[3],[4]
Investments maturity date	2014-01	[2],[3],[4]
Investments sold short, at fair value-	(62,617)	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 year) 3.00% 2014-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(58,960)	[2],[3],[4]
Description	Federal National Mortgage Association (15 year)	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Investments maturity date	2014-01	[2],[3],[4]
Investments sold short, at fair value-	(60,158)	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 year) 4.00% 2014-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(57,837)	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation (30 year)	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Investments maturity date	2014-01	[2],[3],[4]
Investments sold short, at fair value-	(59,409)	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 year) 2.50% 2014-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(31,150)	[2],[3],[4]
Description	Federal National Mortgage Association (15 year)	[2],[3],[4]
Rate	2.50%	[2],[3],[4]
Investments maturity date	2014-01	[2],[3],[4]
Investments sold short, at fair value-	(30,816)	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 year) 4.50% 2014-02 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(24,400)	[2],[3],[4]
Description	Federal National Mortgage Association (30 year)	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Investments maturity date	2014-02	[2],[3],[4]
Investments sold short, at fair value-	(25,798)	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 year) 5.00% 2014-02 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(23,200)	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation (30 year)	[2],[3],[4]
Rate	5.00%	[2],[3],[4]
Investments maturity date	2014-02	[2],[3],[4]
Investments sold short, at fair value-	(24,996)	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 year) 4.00% 2014-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(16,604)	[2],[3],[4]
Description	Federal National Mortgage Association (15 year)	[2],[3],[4]
Rate	4.00%	[2],[3],[4]
Investments maturity date	2014-01	[2],[3],[4]
Investments sold short, at fair value-	(17,589)	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (15 year) 3.50% 2014-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(8,200)	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation (15 year)	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Investments maturity date	2014-01	[2],[3],[4]
Investments sold short, at fair value-	(8,550)	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 year) 5.50% 2014-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(6,700)	[2],[3],[4]
Description	Federal National Mortgage Association (30 year)	[2],[3],[4]
Rate	5.50%	[2],[3],[4]
Investments maturity date	2014-01	[2],[3],[4]
Investments sold short, at fair value-	(7,373)	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 year) 3.50% 2014-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(6,550)	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation (30 year)	[2],[3],[4]
Rate	3.50%	[2],[3],[4]
Investments maturity date	2014-01	[2],[3],[4]
Investments sold short, at fair value-	(6,495)	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (15 year) 3.00% 2014-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(4,100)	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation (15 year)	[2],[3],[4]
Rate	3.00%	[2],[3],[4]
Investments maturity date	2014-01	[2],[3],[4]
Investments sold short, at fair value-	(4,175)	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 year) 4.50% 2014-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(3,900)	[2],[3],[4]
Description	Federal Home Loan Mortgage Corporation (30 year)	[2],[3],[4]
Rate	4.50%	[2],[3],[4]
Investments maturity date	2014-01	[2],[3],[4]
Investments sold short, at fair value-	(4,129)	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Other Federal National Mortgage Association (30 year) 6.00% 2014-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(2,500)	[2],[3],[4]
Description	Other Federal National Mortgage Association (30 Year)	[2],[3],[4]
Rate	6.00%	[2],[3],[4]
Investments maturity date	2014-01	[2],[3],[4]
Investments sold short, at fair value-	(2,776)	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Other Federal Home Loan Mortgage Corporation (30 year) 2014-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(3,815)	[2],[3],[4]
Description	Other Federal Home Loan Mortgage Corporation (30 Year)	[2],[3],[4]
Investments maturity date	2014-01	[2],[3],[4]
Investments sold short, at fair value-	(3,685)	[2],[3],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 3.50% 2013-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			(198,168)	[2],[5]
Description			Federal National Mortgage Association (30 Year)	[2],[5]
Rate			3.50%	[2],[5]
Investments maturity date			2013-01	[2],[5]
Investments sold short, at fair value-			(211,343)	[2],[5]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 5.00% 2013-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			(87,500)	[2],[5]
Description			Federal National Mortgage Association (30 Year)	[2],[5]
Rate			5.00%	[2],[5]
Investments maturity date			2013-01	[2],[5]
Investments sold short, at fair value-			(94,794)	[2],[5]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 4.50% 2013-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			(77,730)	[2],[5]
Description			Federal National Mortgage Association (30 Year)	[2],[5]
Rate			4.50%	[2],[5]
Investments maturity date			2013-01	[2],[5]
Investments sold short, at fair value-			(83,982)	[2],[5]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 3.50% 2013-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			(53,400)	[2],[5]
Description			Federal Home Loan Mortgage Corporation (30 Year)	[2],[5]
Rate			3.50%	[2],[5]
Investments maturity date			2013-01	[2],[5]
Investments sold short, at fair value-			(56,804)	[2],[5]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 3.00% 2013-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			(34,510)	[2],[5]
Description			Federal National Mortgage Association (15 Year)	[2],[5]
Rate			3.00%	[2],[5]
Investments maturity date			2013-01	[2],[5]
Investments sold short, at fair value-			(36,430)	[2],[5]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 3.00% 2013-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			(31,600)	[2],[5]
Description			Federal National Mortgage Association (30 Year)	[2],[5]
Rate			3.00%	[2],[5]
Investments maturity date			2013-01	[2],[5]
Investments sold short, at fair value-			(33,128)	[2],[5]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 5.00% 2013-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			(16,500)	[2],[5]
Description			Federal Home Loan Mortgage Corporation (30 Year)	[2],[5]
Rate			5.00%	[2],[5]
Investments maturity date			2013-01	[2],[5]
Investments sold short, at fair value-			(17,776)	[2],[5]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 3.50% 2013-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			(16,450)	[2],[5]
Description			Federal National Mortgage Association (15 Year)	[2],[5]
Rate			3.50%	[2],[5]
Investments maturity date			2013-01	[2],[5]
Investments sold short, at fair value-			(17,460)	[2],[5]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 4.00% 2013-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			(15,718)	[2],[5]
Description			Federal National Mortgage Association (30 Year)	[2],[5]
Rate			4.00%	[2],[5]
Investments maturity date			2013-01	[2],[5]
Investments sold short, at fair value-			(16,852)	[2],[5]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 4.00% 2013-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			(14,104)	[2],[5]
Description			Federal National Mortgage Association (15 Year)	[2],[5]
Rate			4.00%	[2],[5]
Investments maturity date			2013-01	[2],[5]
Investments sold short, at fair value-			(15,096)	[2],[5]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 4.50% 2013-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			(11,000)	[2],[5]
Description			Federal National Mortgage Association (15 Year)	[2],[5]
Rate			4.50%	[2],[5]
Investments maturity date			2013-01	[2],[5]
Investments sold short, at fair value-			(11,833)	[2],[5]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 5.50% 2013-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			(7,500)	[2],[5]
Description			Federal National Mortgage Association (30 Year)	[2],[5]
Rate			5.50%	[2],[5]
Investments maturity date			2013-01	[2],[5]
Investments sold short, at fair value-			(8,148)	[2],[5]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 6.00% 2013-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			(2,500)	[2],[5]
Description			Federal National Mortgage Association (30 Year)	[2],[5]
Rate			6.00%	[2],[5]
Investments maturity date			2013-01	[2],[5]
Investments sold short, at fair value-			(2,731)	[2],[5]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Other Federal National Mortgage Association (15 Year) 2.50% 2013-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			(1,200)	[2],[5]
Description			Other Federal National Mortgage Association (15 Year)	[2],[5]
Rate			2.50%	[2],[5]
Investments maturity date			2013-01	[2],[5]
Investments sold short, at fair value-			(1,255)	[2],[5]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Other Federal Home Loan Mortgage Corporation (30 Year) 6.00% 2013-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			(1,000)	[2],[5]
Description			Other Federal Home Loan Mortgage Corporation (30 Year)	[2],[5]
Rate			6.00%	[2],[5]
Investments maturity date			2013-01	[2],[5]
Investments sold short, at fair value-			(1,088)	[2],[5]
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	(111.89%)		(105.27%)
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	(17.80%)		(14.95%)
Us Treasury Securities Sold Short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity			(2.68%)	[1],[2]
Investments sold short, at fair value-			(13,581)	[2]
Proceeds from investments sold short			(13,081)	[2]
Us Treasury Securities Sold Short [Member] | U.S. Treasury Note 1.75% 2016-05 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount			(13,000)	[2]
Description			U.S. Treasury Note	[2]
Rate			1.75%	[2]
Investments maturity date			2016-05	[2]
Investments sold short, at fair value-			(13,581)	[2]
Government debt sold short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity	(4.36%)	[1],[2],[3]
Investments sold short, at fair value-	(27,288)	[2],[3]
Proceeds from investments sold short	(27,532)	[2],[3]
Government debt sold short [Member] | U.S. Treasury Note 1.25% 2018-10 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(20,000)	[2],[3]
Description	U.S. Treasury Note	[2],[3]
Rate	1.25%	[2],[3]
Investments maturity date	2018-10	[2],[3]
Investments sold short, at fair value-	(19,607)	[2],[3]
Government debt sold short [Member] | Sovereign Bond 3.75% 2018-10 [Member]
Investments Sold, Not yet Purchased [Line Items]
Current Principal/Notional Amount	(7,337)	[2],[3]
Description	European Sovereign Bond	[2],[3]
Rate	3.75%	[2],[3]
Investments maturity date	2018-10	[2],[3]
Investments sold short, at fair value-	(7,681)	[2],[3]
Common Stock Sold Short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity	(1.02%)	[1],[2],[3]
Investments sold short, at fair value-	(6,369)	[2],[3]
Proceeds from investments sold short	(6,313)	[2],[3]
Common Stock Sold Short [Member] | Publicly Traded Real Estate Investment Trusts [Member]
Investments Sold, Not yet Purchased [Line Items]
Description	Publicly Traded Real Estate Investment Trusts	[2],[3]
Investments sold short, at fair value-	(6,369)	[2],[3]
Investment Sold, Not yet Purchased, Balance, Shares	(763)	[2],[3]
Securities Sold Short - Securities Sold, Not Yet Purchased [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity	(135.07%)	[1],[2],[3]	(122.90%)	[1],[2]
Investments sold short, at fair value-	(845,614)	[2],[3]	(622,301)	[2]
Proceeds from investments sold short	(847,602)	[2],[3]	(621,048)	[2]
Minimum [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Other Federal Home Loan Mortgage Corporation (30 year) 2014-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	2.50%	[2],[3],[4]
Maximum [Member] | TBA - Fixed Rate Agency Securities Sold Short [Member] | Other Federal Home Loan Mortgage Corporation (30 year) 2014-01 [Member]
Investments Sold, Not yet Purchased [Line Items]
Rate	5.50%	[2],[3],[4]
Europe [Member] | Securities Sold Short - Securities Sold, Not Yet Purchased [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity	(1.23%)
Current Principal/Notional Amount	(7,337)
Investments sold short, at fair value-	(7,681)
Proceeds from investments sold short	(7,633)
North America [Member] | Common Stock Sold Short [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity	(1.02%)
Investments sold short, at fair value-	(6,369)
Investment Sold, Not yet Purchased, Balance, Shares	(763)
Proceeds from investments sold short	(6,313)
North America [Member] | Securities Sold Short - Securities Sold, Not Yet Purchased [Member]
Investments Sold, Not yet Purchased [Line Items]
Investment Sold, Not yet Purchased, Percent of Equity	(132.82%)
Current Principal/Notional Amount	(804,888)
Investments sold short, at fair value-	(831,564)
Proceeds from investments sold short	$ (833,656)

[1] Classification percentages are based on Total Equity.

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

[3] The following table details the breakout by geographical region of long investments, investments sold short, and repurchase agreements:Region Current Principal/Number of Shares Cost Fair Value Percent ofEquityLong Investments: (In thousands, Expressed in U.S. Dollars) North America 2,470,650 $1,682,533 $1,724,370 275.44 %Europe 7,641 5,724 5,760 0.92 %Total 2,478,291 $1,688,257 $1,730,130 276.36 %Investments Sold Short: North America (TBAs and Government Debt) (804,888) $(833,656) $(831,564) (132.82)%Europe (Government Debt) (7,337) (7,633) (7,681) (1.23)%North America (Common Stock) (763) (6,313) (6,369) (1.02)%Total $(847,602) $(845,614) (135.07)%Repurchase Agreements: North America 19,675 $19,675 $19,675 3.15 %Europe 8,287 8,268 8,287 1.32 %Total 27,962 $27,943 $27,962 4.47 %

[4] At December 31, 2013, the Company's short investments guaranteed by the Federal National Mortgage Association and the Federal Home Loan Mortgage Corporation represented 111.89% and 17.80% of equity, respectively.

[5] At December 31, 2012, the Company's short investments guaranteed by the Federal National Mortgage Association and the Federal Home Loan Mortgage Corporation represented 105.27% and 14.95% of equity, respectively.