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Derivative Instruments (Schedule Of Average Notional Value By Sector Of Futures And Forward Currency Contracts) (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Long [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts $ 638,778,038 $ 711,424,947 $ 647,209,847 $ 651,438,869 $ 1,298,466,252
Long [Member] | Futures Contracts [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts 563,199,016 623,381,797 551,918,998 594,608,329 1,069,608,758
Long [Member] | Energies [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts 5,304,721 9,908,768 9,885,686 1,449,651 58,506,140
Long [Member] | Grains [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts 105,533 3,483,270 5,699,917 4,514,320 18,708,435
Long [Member] | Interest Rates [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts 369,718,745 465,765,592 433,868,811 443,862,760 684,099,838
Long [Member] | Livestock [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts 508,193 55,860 75,460 312,778 6,012,536
Long [Member] | Metals [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts 12,756,310 8,167,515 3,391,534 2,425,751 32,405,876
Long [Member] | Softs [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts 421,375 2,494,206 2,867,192 2,068,245 5,798,787
Long [Member] | Stock Indices [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts 174,384,139 133,506,586 96,130,398 139,974,824 264,077,146
Long [Member] | Forward Currency Contracts [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts 75,579,022 88,043,150 95,290,849 56,830,540 228,857,494
Short [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts 186,869,927 165,588,171 148,741,279 189,839,013 179,306,621
Short [Member] | Futures Contracts [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts 75,409,080 63,521,177 68,116,089 91,966,523 113,364,695
Short [Member] | Energies [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts 25,161,374 10,663,625 13,083,750 19,980,201 36,503,884
Short [Member] | Grains [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts 19,042,922 16,076,288 15,034,753 9,729,741 17,339,007
Short [Member] | Interest Rates [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts 3,433,941 7,201,812 8,546,357 19,265,790 29,797,825
Short [Member] | Livestock [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts 578,507 1,364,840 1,308,067 1,891,970 2,708,046
Short [Member] | Metals [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts 8,143,304 14,594,787 16,259,462 25,691,322 13,151,885
Short [Member] | Softs [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts 5,662,123 1,866,875 1,660,076 4,421,026 7,150,901
Short [Member] | Stock Indices [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts 13,386,909 11,752,950 12,223,624 10,986,473 6,713,147
Short [Member] | Forward Currency Contracts [Member]          
Derivative [Line Items]          
Average notional amount of futures and forward currency contracts $ 111,460,847 $ 102,066,994 $ 80,625,190 $ 97,872,490 $ 65,941,926