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Summary Of Significant Accounting Policies (Activity In Gold Bullion) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
oz
Sep. 30, 2011
oz
Summary Of Significant Accounting Policies [Abstract]  
Beginning balance, Ounces4,638,6003,783,000
Gold contributed, Ounces847,7002,033,500
Gold distributed, Ounces(219,100)(544,400)
Gold sold, Ounces(3,000)(7,900)
Ending balance, Ounces5,264,2005,264,200
Beginning balance, Average Cost$ 4,978,476$ 3,568,036
Gold contributed, Average Cost1,409,8163,139,985
Gold distributed, Average Cost(254,552)(569,456)
Gold sold, Average Cost(3,372)(8,197)
Ending balance, Average Cost6,130,3686,130,368
Beginning balance, Fair Value6,983,4355,317,017
Gold contributed, Fair Value1,409,8163,139,985
Gold distributed, Fair Value(375,194)(819,772)
Gold sold, Fair Value(4,991)(11,981)
Adjustment for realized gain, Fair Value122,261254,100
Adjustment for unrealized gain on gold bullion, Fair Value392,743648,721
Ending balance, Fair Value8,528,0708,528,070
Gold distributed, Realized Gain (Loss)120,642250,316
Gold sold, Realized Gain (Loss)1,6193,784
Ending balance, Realized Gain (Loss)$ 122,261$ 254,100