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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
ASSETS |  |
Cash and cash equivalents | $ 282,248 | $ 5,926
Accounts receivable (Note 2) | 318,371 | 254,805
Refundable income taxes | 4,630 | 3,364
Prepaid expenses and other | 9,944 | 30,017
Derivative asset | 21,559 | 37,873
Deferred income taxes | 10,749 | 8,579
Total current assets | 647,501 | 340,564
Land | 1,857 | 1,845
Proved oil and gas properties | 5,637,462 | 5,401,684
Less - accumulated depletion, depreciation, and amortization | (2,583,698) | (2,376,170)
Unproved oil and gas properties | 271,100 | 175,287
Wells in progress | 279,654 | 273,928
Materials inventory, at lower of cost or market | 15,950 | 13,444
Oil and gas properties held for sale, net of accumulated depletion, depreciation and amortization of $7,390 in 2013 and $20,676 in 2012 | 19,072 | 33,620
Other property and equipment, net of accumulated depreciation of $28,775 in 2013 and $22,442 in 2012 | 218,395 | 153,559
Total property and equipment, net | 3,859,792 | 3,677,197
Derivative asset | 30,951 | 16,466
Restricted cash | 96,713 | 86,773
Other noncurrent assets | 70,208 | 78,529
Total other noncurrent assets | 197,872 | 181,768
Total Assets | 4,705,165 | 4,199,529
LIABILITIES |  |
Accounts payable and accrued expenses (note 2) | 606,751 | 525,627
Derivative liabilities | 26,380 | 8,999
Other current liabilities | 6,000 | 6,920
Total current liabilities | 639,131 | 541,546
Revolving credit facility | 0 | 340,000
Senior Notes (note 5) | 1,600,000 | 1,100,000
Asset retirement obligation | 115,659 | 112,912
Asset retirement obligation associated with oil and gas properties held for sale | 3,033 | 1,393
Net Profits Plan liability | 56,985 | 78,827
Deferred income taxes; Net, non-current | 650,125 | 537,383
Derivative liabilities | 4,640 | 6,645
Other noncurrent liabilities | 28,771 | 66,357
Total noncurrent liabilities | 2,459,213 | 2,243,517
Commitments and contingencies (note 6) |  |
STOCKHOLDERS' EQUITY |  |
Common stock, $0.01 par value - authorized: 200,000,000 shares; issued: 67,078,853 shares in 2013 and 66,245,816 shares in 2012; outstanding, net of treasury shares: 67,056,441 shares in 2013 and 66,195,235 shares in 2012 | 671 | 662
Additional paid-in capital | 257,720 | 233,642
Treasury stock, at cost: 22,412 shares in 2013 and 50,581 shares in 2012 | (823) | (1,221)
Retained earnings | 1,354,669 | 1,190,397
Accumulated other comprehensive loss | (5,416) | (9,014)
Total stockholders' equity | 1,606,821 | 1,414,466
Total Liabilities and Stockholders' Equity | $ 4,705,165 | $ 4,199,529

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- Definition Oil and Gas properties with proved reserves under the successful effort method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Glossary Proved Properties -URI http://asc.fasb.org/extlink&oid=6522428 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64746-109465 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 11 -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. + Details
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- Definition Oil and Gas properties with unproved reserves under the successful effort method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61926-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -Glossary Unproved Properties -URI http://asc.fasb.org/extlink&oid=6527831 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64746-109465 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 11 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 147, 148 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 59N -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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