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Consolidated Condensed Schedule Of Investments (Investments Sold Short) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Investments Sold, Not yet Purchased [Line Items]    
Investments sold short at fair value- $ (860,128) $ (622,301)
Proceeds from investments sold short (850,801) (621,048)
TBA - Fixed Rate Agency Securities Sold Short [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Investment Sold, Not yet Purchased, Percent of Net Assets (130.09%) [1],[2],[3] (120.22%) [1],[2],[4]
Investments sold short at fair value- (819,334) [2],[3] (608,720) [2],[4]
Proceeds from investments sold short (808,881) [2],[3] (607,967) [2],[4]
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 3.50% 2013-10 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (175,482) [2],[3]  
Description Federal National Mortgage Association (30 Year)  
Rate 3.50% [2],[3]  
Investments maturity date 2013-10 [2],[3]  
Investments sold short at fair value- (178,704) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 3.50% 2013-11 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (61,200) [2],[3]  
Description Federal National Mortgage Association (30 Year)  
Rate 3.50% [2],[3]  
Investments maturity date 2013-11 [2],[3]  
Investments sold short at fair value- (62,128) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 3.00% 2013-10 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (56,160) [2],[3]  
Description Federal National Mortgage Association (15 Year)  
Rate 3.00% [2],[3]  
Investments maturity date 2013-10 [2],[3]  
Investments sold short at fair value- (58,143) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 3.50% 2013-10 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (54,000) [2],[3]  
Description Federal National Mortgage Association (15 Year)  
Rate 3.50% [2],[3]  
Investments maturity date 2013-10 [2],[3]  
Investments sold short at fair value- (57,004) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 5.00% 2013-10 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (50,500) [2],[3]  
Description Federal National Mortgage Association (30 Year)  
Rate 5.00% [2],[3]  
Investments maturity date 2013-10 [2],[3]  
Investments sold short at fair value- (54,769) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 4.50% 2013-11 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (41,500) [2],[3]  
Description Federal National Mortgage Association (30 Year)  
Rate 4.50% [2],[3]  
Investments maturity date 2013-11 [2],[3]  
Investments sold short at fair value- (44,206) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 4.00% 2013-11 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (41,600) [2],[3]  
Description Federal National Mortgage Association (30 Year)  
Rate 4.00% [2],[3]  
Investments maturity date 2013-11 [2],[3]  
Investments sold short at fair value- (43,482) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 4.00% 2013-10 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (38,280) [2],[3]  
Description Federal National Mortgage Association (30 Year)  
Rate 4.00% [2],[3]  
Investments maturity date 2013-10 [2],[3]  
Investments sold short at fair value- (40,149) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 4.00% 2013-10 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (37,237) [2],[3]  
Description Federal Home Loan Mortgage Corporation (30 Year)  
Rate 4.00% [2],[3]  
Investments maturity date 2013-10 [2],[3]  
Investments sold short at fair value- (38,921) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 3.00% 2013-10 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (39,150) [2],[3]  
Description Federal National Mortgage Association (30 Year)  
Rate 3.00% [2],[3]  
Investments maturity date 2013-10 [2],[3]  
Investments sold short at fair value- (38,255) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 4.50% 2013-10 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (34,830) [2],[3]  
Description Federal National Mortgage Association (30 Year)  
Rate 4.50% [2],[3]  
Investments maturity date 2013-10 [2],[3]  
Investments sold short at fair value- (37,201) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 4.00% 2013-11 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (34,000) [2],[3]  
Description Federal Home Loan Mortgage Corporation (30 Year)  
Rate 4.00% [2],[3]  
Investments maturity date 2013-11 [2],[3]  
Investments sold short at fair value- (35,424) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 2.50% 2013-10 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (22,450) [2],[3]  
Description Federal National Mortgage Association (15 Year)  
Rate 2.50% [2],[3]  
Investments maturity date 2013-10 [2],[3]  
Investments sold short at fair value- (22,585) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporataion (30 Year) 5.00% 2013-10 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (16,500) [2],[3]  
Description Federal Home Loan Mortgage Corporation (30 Year)  
Rate 5.00% [2],[3]  
Investments maturity date 2013-10 [2],[3]  
Investments sold short at fair value- (17,799) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 4.00% 2013-10 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (14,104) [2],[3]  
Description Federal National Mortgage Association (15 Year)  
Rate 4.00% [2],[3]  
Investments maturity date 2013-10 [2],[3]  
Investments sold short at fair value- (14,981) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 5.00% 2013-12 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (13,100) [2],[3]  
Description Federal Home Loan Mortgage Corporation (30 Year)  
Rate 5.50% [2],[3]  
Investments maturity date 2013-12 [2],[3]  
Investments sold short at fair value- (14,189) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 3.50% 2013-10 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (13,550) [2],[3]  
Description Federal Home Loan Mortgage Corporation (30 Year)  
Rate 3.50% [2],[3]  
Investments maturity date 2013-10 [2],[3]  
Investments sold short at fair value- (13,760) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (15 Year) 4.50% 2013-10 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (11,000) [2],[3]  
Description Federal National Mortgage Association (15 Year)  
Rate 4.50% [2],[3]  
Investments maturity date 2013-10 [2],[3]  
Investments sold short at fair value- (11,677) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal National Mortgage Association (30 Year) 5.50% 2013-10 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (7,500) [2],[3]  
Description Federal National Mortgage Association (30 Year)  
Rate 5.50% [2],[3]  
Investments maturity date 2013-10 [2],[3]  
Investments sold short at fair value- (8,177) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 5.50% 2013-11 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (7,000) [2],[3]  
Description Federal Home Loan Mortgage Corporation (30 Year)  
Rate 5.50% [2],[3]  
Investments maturity date 2013-11 [2],[3]  
Investments sold short at fair value- (7,584) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (30 Year) 3.50% 2013-11 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (6,700) [2],[3]  
Description Federal Home Loan Mortgage Corporation (30 Year)  
Rate 3.50% [2],[3]  
Investments maturity date 2013-11 [2],[3]  
Investments sold short at fair value- (6,783) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (15 Year) 3.00% 2013-10 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (5,100) [2],[3]  
Description Federal Home Loan Mortgage Corporation (15 Year)  
Rate 3.00% [2],[3]  
Investments maturity date 2013-10 [2],[3]  
Investments sold short at fair value- (5,272) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Federal Home Loan Mortgage Corporation (15 Year) 3.50% 2013-10 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (4,100) [2],[3]  
Description Federal Home Loan Mortgage Corporation (15 Year)  
Rate 3.50% [2],[3]  
Investments maturity date 2013-10 [2],[3]  
Investments sold short at fair value- (4,315) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Other Federal National Mortgage Association (30 Year) 6.00% 2013-10 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (2,500) [2],[3]  
Description Other Federal National Mortgage Association (30 Year)  
Rate 6.00% [2],[3]  
Investments maturity date 2013-10 [2],[3]  
Investments sold short at fair value- (2,735) [2],[3]  
TBA - Fixed Rate Agency Securities Sold Short [Member] | Other Federal Home Loan Mortgage Corporation (30 Year) 6.00% 2013-10 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (1,000) [2],[3]  
Description Other Federal Home Loan Mortgage Corporation (30 Year)  
Rate 6.00% [2],[3]  
Investments maturity date 2013-10 [2],[3]  
Investments sold short at fair value- (1,091) [2],[3]  
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],[4]
Description   Federal National Mortgage Association (30 Year) [2],[4]
Rate   3.50% [2],[4]
Investments maturity date   2013-01 [2],[4]
Investments sold short at fair value-   (211,343) [2],[4]
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],[4]
Description   Federal National Mortgage Association (30 Year) [2],[4]
Rate   5.00% [2],[4]
Investments maturity date   2013-01 [2],[4]
Investments sold short at fair value-   (94,794) [2],[4]
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],[4]
Description   Federal National Mortgage Association (30 Year) [2],[4]
Rate   4.50% [2],[4]
Investments maturity date   2013-01 [2],[4]
Investments sold short at fair value-   (83,982) [2],[4]
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],[4]
Description   Federal Home Loan Mortgage Corporation (30 Year) [2],[4]
Rate   3.50% [2],[4]
Investments maturity date   2013-01 [2],[4]
Investments sold short at fair value-   (56,804) [2],[4]
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],[4]
Description   Federal National Mortgage Association (15 Year) [2],[4]
Rate   3.00% [2],[4]
Investments maturity date   2013-01 [2],[4]
Investments sold short at fair value-   (36,430) [2],[4]
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],[4]
Description   Federal National Mortgage Association (30 Year) [2],[4]
Rate   3.00% [2],[4]
Investments maturity date   2013-01 [2],[4]
Investments sold short at fair value-   (33,128) [2],[4]
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],[4]
Description   Federal Home Loan Mortgage Corporation (30 Year) [2],[4]
Rate   5.00% [2],[4]
Investments maturity date   2013-01 [2],[4]
Investments sold short at fair value-   (17,776) [2],[4]
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],[4]
Description   Federal National Mortgage Association (15 Year) [2],[4]
Rate   3.50% [2],[4]
Investments maturity date   2013-01 [2],[4]
Investments sold short at fair value-   (17,460) [2],[4]
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],[4]
Description   Federal National Mortgage Association (30 Year) [2],[4]
Rate   4.00% [2],[4]
Investments maturity date   2013-01 [2],[4]
Investments sold short at fair value-   (16,852) [2],[4]
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],[4]
Description   Federal National Mortgage Association (15 Year) [2],[4]
Rate   4.00% [2],[4]
Investments maturity date   2013-01 [2],[4]
Investments sold short at fair value-   (15,096) [2],[4]
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],[4]
Description   Federal National Mortgage Association (15 Year) [2],[4]
Rate   4.50% [2],[4]
Investments maturity date   2013-01 [2],[4]
Investments sold short at fair value-   (11,833) [2],[4]
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],[4]
Description   Federal National Mortgage Association (30 Year) [2],[4]
Rate   5.50% [2],[4]
Investments maturity date   2013-01 [2],[4]
Investments sold short at fair value-   (8,148) [2],[4]
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],[4]
Description   Federal National Mortgage Association (30 Year) [2],[4]
Rate   6.00% [2],[4]
Investments maturity date   2013-01 [2],[4]
Investments sold short at fair value-   (2,731) [2],[4]
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],[4]
Description   Other Federal National Mortgage Association (15 Year) [2],[4]
Rate   2.50% [2],[4]
Investments maturity date   2013-01 [2],[4]
Investments sold short at fair value-   (1,255) [2],[4]
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],[4]
Description   Other Federal Home Loan Mortgage Corporation (30 Year) [2],[4]
Rate   6.00% [2],[4]
Investments maturity date   2013-01 [2],[4]
Investments sold short at fair value-   (1,088) [2],[4]
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 Net Assets (107.05%) (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 Net Assets (23.04%) (14.95%)
U.S. Treasury Securities Sold Short [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Investment Sold, Not yet Purchased, Percent of Net Assets (6.48%) [1],[2] (2.68%) [1],[2]
Investments sold short at fair value- (40,794) [2] (13,581) [2]
Proceeds from investments sold short (41,920) [2] (13,081) [2]
U.S. Treasury Securities Sold Short [Member] | U.S. Treasury Note 2.00% 2023-02 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (18,700) [2]  
Description U.S. Treasury Note [2]  
Rate 2.00% [2]  
Investments maturity date 2023-02 [2]  
Investments sold short at fair value- (17,796) [2]  
U.S. 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] (13,000) [2]
Description U.S. Treasury Note [2] U.S. Treasury Note [2]
Rate 1.75% [2] 1.75% [2]
Investments maturity date 2016-05 [2] 2016-05 [2]
Investments sold short at fair value- (13,415) [2] (13,581) [2]
U.S. Treasury Securities Sold Short [Member] | U.S. Treasury Note 1.13% 2019-02 [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Current Principal/Notional Amount (10,000) [2]  
Description U.S. Treasury Note [2]  
Rate 1.13% [2]  
Investments maturity date 2019-12 [2]  
Investments sold short at fair value- (9,583) [2]  
Securities Sold Short - Securities Sold, Not Yet Purchased [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Investment Sold, Not yet Purchased, Percent of Net Assets (136.57%) [1],[2] (122.90%) [1],[2]
Investments sold short at fair value- (860,128) [2] (622,301) [2]
Proceeds from investments sold short $ (850,801) [2] $ (621,048) [2]
[1] Classification percentages are based on Total Equity.
[2] See Note 2 and Note 3 in Notes to Consolidated Financial Statements.
[3] At September 30, 2013, the Company's short investments guaranteed by the Federal National Mortgage Association and the Federal Home Loan Mortgage Corporation represented 107.05% and 23.04% of equity, respectively.
[4] 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.