Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2011

Fair Value Measurements (Tables) [Abstract]

Financial assets and liabilities measured at fair value on recurring basis

	Fair Value at June 30, 2011
	Total		Level 1		Level 2		Level 3
Assets:
Cash equivalents	$	39,509	$	39,509	$	—	$	—
Short-term deposits		480		480		—		—
Marketable equity securities		9,056		9,056		—		—
Restricted certificates of deposit		1,178		1,178		—		—
Put and call options		5,583		5,583		—		—
Silver ounces receivable from Mandalay		2,058		—		2,058		—
	$	57,864	$	55,806	$	2,058	$	—
Liabilities:
Royalty obligation embedded derivative	$	164,891	$	—	$	164,891	$	—
Put and call options		18,655		18,655		—		—
Other derivative instruments, net		890		—		890		—
	$	184,436	$	18,655	$	165,781	$	—

	Fair Value at December 31, 2010
	Total		Level 1		Level 2		Level 3
Assets:
Cash equivalents	$	11	$	11	$	—	$	—
Restricted certificates of deposit		2,965		2,965		—		—
Gold forward contract		425		425		—		—
Put and call options		5,403		5,403		—		—
Silver ounces receivable from Mandalay		1,594		—		1,594		—
Other derivative instruments, net		1,685		—		1,685		—
	$	12,083	$	8,804	$	3,279	$	—
Liabilities:
Gold lease facility	$	2,213	$	—	$	2,213	$	—
Royalty obligation embedded derivative		162,003		—		162,003		—
Put and call options		20,151		20,151		—		—
	$	184,367	$	20,151	$	164,216	$	—