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Condensed Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
ASSETS |  |
Cash and cash equivalents | $ 287,298 | $ 470,872
Short-term investments |  | 19,994
Accounts receivable - oil and gas revenues | 78,455 | 52,164
Accounts receivable - joint interest partners | 67,015 | 67,268
Inventory | 10,422 | 3,543
Prepaid expenses | 1,740 | 2,140
Advances to joint interest partners | 3,280 | 3,935
Deferred income taxes | 6,807 | 3,233
Other current assets | 80 | 491
Total current assets | 455,097 | 623,640
Property, plant and equipment |  |
Oil and gas properties (successful efforts method) | 1,515,788 | 1,235,357
Other property and equipment | 38,660 | 20,859
Less: accumulated depreciation, depletion, amortization and impairment | (215,436) | (176,261)
Total property, plant and equipment, net | 1,339,012 | 1,079,955
Derivative instruments | 486 | 4,362
Deferred costs and other assets | 18,815 | 19,425
Total assets | 1,813,410 | 1,727,382
LIABILITIES AND STOCKHOLDERS' EQUITY |  |
Accounts payable | 516 | 12,207
Advances from joint interest partners | 14,548 | 9,064
Revenues and production taxes payable | 45,276 | 19,468
Accrued liabilities | 139,713 | 119,692
Accrued interest payable | 15,024 | 15,774
Derivative instruments | 16,469 | 5,907
Other current liabilities | 316 | 472
Total current liabilities | 231,862 | 182,584
Long-term debt | 800,000 | 800,000
Asset retirement obligations | 15,664 | 13,075
Derivative instruments | 6,434 | 3,505
Deferred income taxes | 106,348 | 92,983
Other liabilities | 2,013 | 997
Total liabilities | 1,162,321 | 1,093,144
Commitments and contingencies (Note 11) |  |
Stockholders' equity |  |
Common stock, $0.01 par value; 300,000,000 shares authorized; 93,136,773 issued and 93,074,949 outstanding at March 31, 2012; 92,483,393 issued and 92,460,914 outstanding at December 31, 2011 | 922 | 921
Treasury stock, at cost; 61,824 and 22,479 shares at March 31, 2012 and December 31, 2011, respectively | (1,783) | (602)
Additional paid-in-capital | 648,964 | 647,374
Retained earnings (deficit) | 2,986 | (13,455)
Total stockholders' equity | 651,089 | 634,238
Total liabilities and stockholders' equity | $ 1,813,410 | $ 1,727,382

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A3 -Appendix A Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707 + Details
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