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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (in thousands, except share amounts) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Assets |  |
Cash and cash equivalents at beginning of period | $ 176 | $ 5,926
Accounts receivable | 278,125 | 254,805
Refundable income taxes | 2,854 | 3,364
Prepaid expense and other | 10,498 | 30,017
Derivative asset | 43,305 | 37,873
Deferred income taxes | 10,912 | 8,579
Total current assets | 345,870 | 340,564
Land | 1,857 | 1,845
Proved oil and gas properties | 5,414,842 | 5,401,684
Less - accumulated depletion, depreciation, and amortization | (2,418,939) | (2,376,170)
Unproved oil and gas properties | 263,662 | 175,287
Wells in progress | 301,609 | 273,928
Materials inventory, at lower of cost or market | 14,115 | 13,444
Oil and gas properties held for sale net of accumulated depletion, depreciation and amortization of $539,769 in 2013 and 20,676 in 2012 | 400,393 | 33,620
Other property and equipment, net of accumulated depreciation of $27,571 in 2013 and $22,442 in 2012 | 203,799 | 153,559
Total property and equipment, net | 4,181,338 | 3,677,197
Derivative asset | 28,659 | 16,466
Restricted cash | 94,700 | 86,773
Other noncurrent assets | 86,278 | 78,529
Total other noncurrent assets | 209,637 | 181,768
Total Assets | 4,736,845 | 4,199,529
Liabilities |  |
Accounts payable and accrued expenses | 601,131 | 525,627
Derivative liability | 22,648 | 8,999
Other current liabilities | 6,000 | 6,920
Total current liabilities | 629,779 | 541,546
Revolving credit facility | 28,000 | 340,000
6.625% Senior Notes Due 2019 | 350,000 | 350,000
6.50% Senior Notes Due 2021 | 350,000 | 350,000
6.50% Senior Notes Due 2023 | 400,000 | 400,000
5.0% Senior Notes Due 2024 | 500,000 | 0
Asset retirement obligation | 101,650 | 112,912
Asset retirement obligation associated with oil and gas properties held for sale | 25,339 | 1,393
Net Profits Plan liability | 72,404 | 78,827
Deferred income taxes | 639,000 | 537,383
Derivatives liability | 6,873 | 6,645
Other noncurrent liabilities | 47,016 | 66,357
Total noncurrent liabilities | 2,520,282 | 2,243,517
Commitments and contingencies (note 6) |  |
Stockholders' equity: |  |
Common stock, $0.01 par value - authorized: 200,000,000 shares; issued: 66,994,516 shares in 2013 and 66,245,816 shares in 2012; outstanding, net of treasury shares: 66,972,104 shares in 2013 and 66,195,235 shares in 2012 | 670 | 662
Additional paid-in-capital | 247,165 | 233,642
Treasury stock, at cost: 22,412 shares in 2013 and 50,581 in 2012 | (823) | (1,221)
Retained earnings | 1,347,674 | 1,190,397
Accumulated other comprehensive loss | (7,902) | (9,014)
Total stockholders' equity | 1,586,784 | 1,414,466
Total Liabilities and Stockholders' Equity | $ 4,736,845 | $ 4,199,529

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