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Intangible Assets | 12 Months Ended
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Dec. 31, 2011
Intangible Assets [Abstract] |
Intangible Assets | 8. Intangible Assets Amounts recorded as intangible assets along with the balances and accumulated amortization at December 31, 2011 and 2010 are reflected in the table below:
|  | December 31, 2011 |  |  | December 31, 2010 |
|  | (In thousands) |
Contract intangibles |  | $ | 89,420 |  |  | $ | 180,233 |
Less accumulated amortization |  |  | (14,258 | ) |  |  | (18,302 | )
Net book value |  | $ | 75,164 |  |  | $ | 161,931 |
|  | For the years ended December 31, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
|  | (In thousands) |
Total amortization expense on intangible assets |  | $ | 9,298 |  |  | $ | 10,150 |  |  | $ | 3,423 |
The estimates of amortization expense for the periods as indicated below are based on current mining plans and are subject to revision as those plans change in future periods.
Estimated amortization expense (In thousands) |  |  |  |
For year ended December 31, 2012 |  | $ | 3,766 |
For year ended December 31, 2013 |  |  | 4,664 |
For year ended December 31, 2014 |  |  | 4,500 |
For year ended December 31, 2015 |  |  | 4,500 |
For year ended December 31, 2016 |  |  | 4,500 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44, 45, 46 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275 + Details
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