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Schedule of Investments
Dec. 31, 2017
USD ($)
Contracts
Dec. 31, 2016
USD ($)
Contracts
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 55,721,680 $ 37,435,507
Open Futures Contracts, Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG February 2018 contracts, expiring January 2018 [Member]    
Notional Amount $ 461,049,780  
Number of Contracts | Contracts 17,082  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 43,381,680  
% of Partners' Capital 6.66%  
Open Futures Contracts, Long [Member] | United States [Member] | ICE Natural Gas Futures LD1 H February 2018 contracts, expiring February 2018 [Member]    
Notional Amount $ 135,310,000  
Number of Contracts | Contracts 20,000  
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 12,340,000  
% of Partners' Capital 1.89%  
Open Futures Contracts, Long [Member] | United States [Member] | NYMEX Natural Gas Futures NG February 2017 contracts, expiring January 2017    
Notional Amount   $ 326,459,573
Number of Contracts | Contracts   9,442
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 25,160,507
% of Partners' Capital   4.68%
Open Futures Contracts, Long [Member] | United States [Member] | ICE Natural Gas Futures LD1 H February 2017 contracts, expiring February 2017    
Notional Amount   $ 173,925,000
Number of Contracts | Contracts   20,000
Value/ Unrealized Gain (Loss) on Open Commodity Contracts   $ 12,275,000
% of Partners' Capital   2.28%
Total Open Futures Contracts [Member] | Open Futures Contracts, Long [Member] | United States [Member]    
Notional Amount $ 596,359,780 [1] $ 500,384,573 [2]
Number of Contracts | Contracts 37,082 [1] 29,442 [2]
Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 55,721,680 [1] $ 37,435,507 [2]
% of Partners' Capital 8.55% [1] 6.96% [2]
Cash Equivalents [Member] | United States [Member]    
Market Value $ 483,194,474 $ 484,298,065
% of Partners' Capital 74.10% 90.05%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member]    
Market Value $ 463,194,474 $ 434,298,065
% of Partners' Capital 71.04% 80.75%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.12%, 1/04/2018 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,999,071  
% of Partners' Capital 1.53%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.11%, 1/11/2018 [Member]    
Principal Amount $ 15,000,000  
Market Value $ 14,995,396  
% of Partners' Capital 2.30%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.10%, 1/18/2018 [Member]    
Principal Amount $ 15,000,000  
Market Value $ 14,992,279  
% of Partners' Capital 2.30%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.12%, 1/25/2018 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,992,567  
% of Partners' Capital 1.53%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.12%, 2/01/2018 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,990,399  
% of Partners' Capital 1.53%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.13%, 2/08/2018 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,988,125  
% of Partners' Capital 1.53%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.12%, 2/15/2018 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,986,125  
% of Partners' Capital 1.53%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.10%, 2/22/2018 [Member]    
Principal Amount $ 15,000,000  
Market Value $ 14,976,383  
% of Partners' Capital 2.30%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.09%, 3/01/2018 [Member]    
Principal Amount $ 20,000,000  
Market Value $ 19,964,436  
% of Partners' Capital 3.06%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.14%, 3/08/2018 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,979,237  
% of Partners' Capital 1.53%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.14%, 3/15/2018 [Member]    
Principal Amount $ 10,000,000  
Market Value $ 9,977,086  
% of Partners' Capital 1.53%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.16%, 3/22/2018 [Member]    
Principal Amount $ 15,000,000  
Market Value $ 14,961,667  
% of Partners' Capital 2.30%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.17%, 3/29/2018 [Member]    
Principal Amount $ 15,000,000  
Market Value $ 14,957,950  
% of Partners' Capital 2.29%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.19%, 4/05/2018 [Member]    
Principal Amount $ 25,000,000  
Market Value $ 24,922,646  
% of Partners' Capital 3.82%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.22%, 4/12/2018 [Member]    
Principal Amount $ 25,000,000  
Market Value $ 24,914,781  
% of Partners' Capital 3.82%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.23%, 4/19/2018 [Member]    
Principal Amount $ 25,000,000  
Market Value $ 24,908,687  
% of Partners' Capital 3.82%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.25%, 4/26/2018 [Member]    
Principal Amount $ 25,000,000  
Market Value $ 24,900,972  
% of Partners' Capital 3.82%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.27%, 5/03/2018 [Member]    
Principal Amount $ 15,000,000  
Market Value $ 14,935,950  
% of Partners' Capital 2.29%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.32%, 5/10/2018 [Member]    
Principal Amount $ 20,000,000  
Market Value $ 19,906,117  
% of Partners' Capital 3.05%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.37%, 5/17/2018 [Member]    
Principal Amount $ 20,000,000  
Market Value $ 19,897,433  
% of Partners' Capital 3.05%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.43%, 5/24/2018 [Member]    
Principal Amount $ 20,000,000  
Market Value $ 19,887,586  
% of Partners' Capital 3.05%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.43%, 5/31/2018 [Member]    
Principal Amount $ 20,000,000  
Market Value $ 19,881,667  
% of Partners' Capital 3.05%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.45%, 6/07/2018 [Member]    
Principal Amount $ 20,000,000  
Market Value $ 19,874,400  
% of Partners' Capital 3.05%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.46%, 6/14/2018 [Member]    
Principal Amount $ 25,000,000  
Market Value $ 24,835,431  
% of Partners' Capital 3.82%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | Us Treasury Bills 1.49%, 6/21/2018 [Member]    
Principal Amount $ 30,000,000  
Market Value $ 29,789,100  
% of Partners' Capital 4.57%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 1.50%, 6/28/2018 [Member]    
Principal Amount $ 30,000,000  
Market Value $ 29,778,983  
% of Partners' Capital 4.57%  
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S. Treasury Bills 0.34%, 1/05/2017 [Member]    
Principal Amount   $ 15,000,000
Market Value   $ 14,999,433
% of Partners' Capital   2.79%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | Us Treasury Bills 0.36%, 1/26/2017 [Member]    
Principal Amount   $ 10,000,000
Market Value   $ 9,997,500
% of Partners' Capital   1.86%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | Us Treasury Bills 0.40%, 2/02/2017 [Member]    
Principal Amount   $ 10,000,000
Market Value   $ 9,996,444
% of Partners' Capital   1.86%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | Us Treasury Bills 0.42%, 2/09/2017 [Member]    
Principal Amount   $ 10,000,000
Market Value   $ 9,995,450
% of Partners' Capital   1.86%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | Us Treasury Bills 0.45%, 2/16/2017 [Member]    
Principal Amount   $ 10,000,000
Market Value   $ 9,994,250
% of Partners' Capital   1.86%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S Treasury Bills 0.45%, 2/23/2017 [Member]    
Principal Amount   $ 10,000,000
Market Value   $ 9,993,449
% of Partners' Capital   1.86%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S Treasury Bills 0.45%, 3/02/2017 [Member]    
Principal Amount   $ 15,000,000
Market Value   $ 14,988,750
% of Partners' Capital   2.79%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S Treasury Bills 0.47%, 3/09/2017 [Member]    
Principal Amount   $ 15,000,000
Market Value   $ 14,986,879
% of Partners' Capital   2.79%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S Treasury Bills 0.50%, 3/16/2017 [Member]    
Principal Amount   $ 15,000,000
Market Value   $ 14,984,506
% of Partners' Capital   2.79%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S Treasury Bills 0.45%, 3/23/2017 [Member]    
Principal Amount   $ 20,000,000
Market Value   $ 19,979,975
% of Partners' Capital   3.71%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S Treasury Bills 0.43%, 3/30/2017 [Member]    
Principal Amount   $ 25,000,000
Market Value   $ 24,973,722
% of Partners' Capital   4.64%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S Treasury Bills 0.46%, 4/06/2017 [Member]    
Principal Amount   $ 20,000,000
Market Value   $ 19,975,986
% of Partners' Capital   3.71%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S Treasury Bills 0.47%, 4/13/2017 [Member]    
Principal Amount   $ 25,000,000
Market Value   $ 24,966,708
% of Partners' Capital   4.64%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S Treasury Bills 0.46%, 4/20/2017 [Member]    
Principal Amount   $ 25,000,000
Market Value   $ 24,965,559
% of Partners' Capital   4.64%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | U.S Treasury Bills 0.47%, 4/27/2017 [Member]    
Principal Amount   $ 25,000,000
Market Value   $ 24,962,542
% of Partners' Capital   4.64%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | Us Treasury Bills 0.49%, 5/04/2017 [Member]    
Principal Amount   $ 20,000,000
Market Value   $ 19,966,346
% of Partners' Capital   3.71%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | Us Treasury Bills 0.55%, 5/11/2017 [Member]    
Principal Amount   $ 20,000,000
Market Value   $ 19,960,639
% of Partners' Capital   3.71%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | Us Treasury Bills 0.60%, 5/18/2017 [Member]    
Principal Amount   $ 20,000,000
Market Value   $ 19,954,714
% of Partners' Capital   3.71%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | Us Treasury Bills 0.61%, 5/25/2017 [Member]    
Principal Amount   $ 20,000,000
Market Value   $ 19,951,400
% of Partners' Capital   3.71%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | Us Treasury Bills 0.60%, 6/01/2017 [Member]    
Principal Amount   $ 25,000,000
Market Value   $ 24,937,608
% of Partners' Capital   4.64%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | Us Treasury Bills 0.62%, 6/08/2017 [Member]    
Principal Amount   $ 20,000,000
Market Value   $ 19,946,017
% of Partners' Capital   3.71%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | Us Treasury Bills 0.65%, 6/15/2017 [Member]    
Principal Amount   $ 25,000,000
Market Value   $ 24,926,094
% of Partners' Capital   4.63%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | Us Treasury Bills 0.64%, 6/22/2017 [Member]    
Principal Amount   $ 20,000,000
Market Value   $ 19,938,844
% of Partners' Capital   3.71%
Cash Equivalents [Member] | United States [Member] | US Treasury Securities [Member] | Us Treasury Bills 0.60%, 6/29/2017 [Member]    
Principal Amount   $ 15,000,000
Market Value   $ 14,955,250
% of Partners' Capital   2.78%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member]    
Market Value $ 20,000,000 $ 50,000,000
% of Partners' Capital 3.06% 9.30%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Fidelity Investments Money Market Funds - Government Portfolio [Member]    
Principal Amount $ 10,000,000 $ 20,000,000
Market Value $ 10,000,000 $ 20,000,000
% of Partners' Capital 1.53% 3.72%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]    
Principal Amount $ 10,000,000 $ 20,000,000
Market Value $ 10,000,000 $ 20,000,000
% of Partners' Capital 1.53% 3.72%
Cash Equivalents [Member] | United States [Member] | Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]    
Principal Amount   $ 10,000,000
Market Value   $ 10,000,000
% of Partners' Capital   1.86%
[1] Collateral amounted to $101,001,407 on open futures contracts.
[2] Collateral amounted to $44,966,225 on open futures contracts.