This element represents the sum of the: (1) acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer and (2) the acquisition-date fair value of any equity interest in the acquiree held by the acquirer prior to the business combination (for example, a step acquisition).

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The number of shares issued as [noncash or part noncash] consideration for a business or asset acquired. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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SUBSEQUENT EVENTS (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended		12 Months Ended			1 Months Ended			1 Months Ended
	Feb. 28, 2012	Jul. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Jan. 31, 2012 Grayd	Nov. 30, 2011 Grayd	Nov. 18, 2011 Grayd	Jan. 31, 2012 Acquisition Grayd	Jan. 23, 2012 Acquisition Grayd
Subsequent event disclosures
Total purchase price to allocate (in dollars)								$ 222,100		$ 11,800
Maximum cash payable to total consideration (in dollars)								$ 165,954		$ 9,300
Shares issued for acquisition of mining property (in shares)		15,000				68,941	1,250,477		68,941
Cash dividends declared per common share (in dollars per share)	$ 0.2		$ 0	$ 0.64	$ 0.18