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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Operating activities: |  |
Net income | $ 12,572 | $ 43,357
Non-cash elements included in net income: |  |
Depreciation, depletion and amortization | 11,269 | 12,327
Gain on sale of investments |  | (611)
Gain on disposition of properties, plants, equipment, and mineral interests | (28) |
Provision for reclamation and closure costs | 1,427 | 279
Stock compensation | 558 | 377
Deferred income taxes | 2,826 | 23,135
Amortization of loan origination fees | 100 | 166
(Gain) loss on derivative contracts | 12,140 | (5,186)
Other non-cash charges, net | 270 | 324
Change in assets and liabilities: |  |
Accounts receivable | 8,014 | (13,395)
Inventories | 1,948 | 1,310
Other current and non-current assets | 549 | 1,683
Accounts payable and accrued liabilities | (5,580) | 1,043
Accrued payroll and related benefits | (3,870) | (1,188)
Accrued taxes | 2,890 | (1,333)
Accrued reclamation and closure costs and other non-current liabilities | (3,659) | (1,378)
Cash provided by operating activities | 41,426 | 60,910
Investing activities: |  |
Additions to properties, plants, equipment and mineral interests | (24,652) | (21,831)
Proceeds from sale of investments |  | 1,366
Proceeds from disposition of properties, plants and equipment | 35 | 112
Purchases of investments |  | (3,200)
Changes in restricted cash and investment balances |  | 5
Net cash used in investing activities | (24,617) | (23,548)
Financing activities: |  |
Proceeds from exercise of stock options and warrants |  | 4,739
Acquisition of treasury shares |  | (18)
Dividends paid to common shareholders | (3,566) |
Dividends paid to preferred shareholders | (138) | (3,408)
Repayments of capital leases | (1,064) | (619)
Net cash (used) provided by financing activities | (4,768) | 694
Change in cash and cash equivalents: |  |
Net increase in cash and cash equivalents | 12,041 | 38,056
Cash and cash equivalents at beginning of period | 266,463 | 283,606
Cash and cash equivalents at end of period | 278,504 | 321,662
Significant non-cash investing and financing activities: |  |
Addition of capital lease obligations | 4,417 | 1,065
Accounts payable change relating to capital additions | $ (2,126) | $ (3,488)

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- Definition The net cash inflow or outflow from financing activity for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3574-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 -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. + Details
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- Definition The net cash inflow or outflow from investing activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3574-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 -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. + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the purchase of all investments (debt, security, other) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 17 -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. + Details
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