Fair Value Measurements (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Assets:
Cash equivalents	$ 39,509	$ 11
Certificates of Deposits	480
Equity Securities	9,056
Restricted certificates of deposits	1,178	2,965
Gold forward contract		425
Put and call options	5,583	5,403
Silver ounce receivable from Mandalay	2,058	1,594
Other derivative instruments , net		1,685
Total assets	57,864	12,083
Liabilities:
Gold lease facility		2,213
Royalty obligation embedded derivative	164,891	162,003
Put and call options	18,655	20,151
Other derivative instruments,net	890
Total liabilities	184,436	184,367
Fair Value, Inputs, Level 1 [Member]
Assets:
Cash equivalents	39,509	11
Certificates of Deposits	480
Equity Securities	9,056
Restricted certificates of deposits	1,178	2,965
Gold forward contract		425
Put and call options	5,583	5,403
Silver ounce receivable from Mandalay	0	0
Other derivative instruments , net		0
Total assets	55,806	8,804
Fair Value, Inputs, Level 1 [Member]
Liabilities:
Gold lease facility		0
Royalty obligation embedded derivative	0	0
Put and call options	18,655	20,151
Other derivative instruments,net	0
Total liabilities	18,655	20,151
Fair Value, Inputs, Level 2 [Member]
Assets:
Cash equivalents	0	0
Certificates of Deposits	0
Equity Securities	0
Restricted certificates of deposits	0	0
Gold forward contract		0
Put and call options	0	0
Silver ounce receivable from Mandalay	2,058	1,594
Other derivative instruments , net		1,685
Total assets	2,058	3,279
Fair Value, Inputs, Level 2 [Member]
Liabilities:
Gold lease facility		2,213
Royalty obligation embedded derivative	164,891	162,003
Put and call options	0	0
Other derivative instruments,net	890
Total liabilities	165,781	164,216
Fair Value, Inputs, Level 3 [Member]
Assets:
Cash equivalents	0	0
Certificates of Deposits	0
Equity Securities	0
Restricted certificates of deposits	0	0
Gold forward contract		0
Put and call options	0	0
Silver ounce receivable from Mandalay	0	0
Other derivative instruments , net		0
Total assets	0	0
Fair Value, Inputs, Level 3 [Member]
Liabilities:
Gold lease facility		0
Royalty obligation embedded derivative	0	0
Put and call options	0	0
Other derivative instruments,net	0
Total liabilities	$ 0	$ 0