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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |
Net income | $ 246,571 | $ 162,388 | $ 195,010
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Provision for doubtful accounts | 1,735 | 2,511 | 129
Depreciation, depletion and amortization | 628,834 | 370,876 | 316,690
Accretion of asset retirement obligations | 28,996 | 9,368 | 9,421
Impairment | 316,004 | 2,825 | 0
Debt issuance costs amortization | 14,388 | 11,372 | 11,006
Amortization of discount, net of premium, on long-term debt | 2,592 | 2,383 | 2,153
Bargain purchase gain | (122,696) | 0 | 0
Loss on extinguishment of debt | 3,075 | 38,232 | 0
Deferred income taxes | (100,288) | (6,986) | (447,500)
Unrealized (gain) loss on derivative contracts | (217,755) | (101,034) | 283,604
Loss (gain) on sale of assets | 3,089 | (2,044) | 2,424
Stock-based compensation | 42,795 | 38,684 | 37,681
Other | (1,537) | 155 | (460)
Changes in operating assets and liabilities increasing (decreasing) cash |  |  |
Receivables | (141,534) | (61,645) | (11,480)
Inventories | 3,111 | (2,998) | (238)
Billings and estimated contract loss in excess of costs incurred, net | (89,003) | (11,013) | (61,180)
Other current assets | (10,649) | 71 | 8,079
Other assets and liabilities, net | 34,447 | (35,773) | 2,667
Asset retirement obligations | (84,361) | (16,531) | (9,234)
Accounts payable and accrued expenses | 121,889 | 51,522 | 42,122
Net cash provided by operating activities | 783,160 | 458,954 | 380,894
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |
Capital expenditures for property, plant and equipment | (2,146,372) | (1,727,106) | (1,035,137)
Acquisitions, net of cash received of $0, $0 and $39,518, respectively | (840,740) | (34,628) | (138,428)
Proceeds from sale of assets | 431,167 | 859,405 | 204,951
Deposit received on pending asset sale | 0 | 0 | 10,000
Refunds of restricted deposits | 0 | 0 | 5,095
Net cash used in investing activities | (2,555,945) | (902,329) | (953,519)
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |
Proceeds from borrowings | 1,850,344 | 2,033,000 | 2,117,914
Repayments of borrowings | (366,029) | (2,130,293) | (1,789,919)
Premium on debt redemption | (844) | (30,338) | 0
Debt issuance costs | (48,538) | (20,326) | (12,540)
Proceeds from issuance of royalty trust units | 587,086 | 917,528 | 0
Proceeds from the sale of royalty trust units | 139,360 | 0 | 0
Noncontrolling interest distributions | (181,727) | (60,200) | (3,515)
Noncontrolling interest contributions | 0 | 0 | 306
Proceeds from issuance of convertible perpetual preferred stock, net | 0 | (231) | 290,704
Stock-based compensation excess tax benefit | (16) | 53 | 15
Purchase of treasury stock | (14,723) | (13,796) | (7,169)
Dividends paid - preferred | (55,525) | (56,742) | (28,525)
Cash (paid) received on settlement of financing derivative contracts | (34,518) | 6,538 | 3,356
Net cash provided by financing activities | 1,874,870 | 645,193 | 570,627
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 102,085 | 201,818 | (1,998)
CASH AND CASH EQUIVALENTS, beginning of year | 207,681 | 5,863 | 7,861
CASH AND CASH EQUIVALENTS, end of year | 309,766 | 207,681 | 5,863
Amended |  |  |
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Realized (gain) loss on derivative contracts | 117,108 | 0 | 0
Financing |  |  |
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Realized (gain) loss on derivative contracts | $ (13,651) | $ 6,591 | $ 0

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- Definition Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: 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 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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b -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 aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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