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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 284 | $ 252
Accounts receivable, less allowance for doubtful accounts of $2,493 and $2,374 | 159,981 | 167,495
Unrealized derivatives | 97,052 | 137,552
Inventory and other | 16,131 | 22,315
Total current assets | 273,448 | 327,614
Unrealized derivatives | 30,467 | 15,715
Equity method investments | 132,115 | 132,449
Natural gas and oil properties, successful efforts method | 8,369,641 | 8,111,775
Accumulated depletion and depreciation | (2,035,850) | (2,015,591)
Natural gas and oil properties, successful efforts method, net | 6,333,791 | 6,096,184
Transportation and field assets | 116,578 | 117,717
Accumulated depreciation and amortization | (80,371) | (76,150)
Transportation and field assets, net | 36,207 | 41,567
Other assets | 124,154 | 115,206
Total assets | 6,930,182 | 6,728,735
Current liabilities: |  |
Accounts payable | 303,618 | 234,651
Asset retirement obligations | 2,366 | 2,470
Accrued liabilities | 133,064 | 139,379
Deferred tax liability | 21,312 | 37,924
Accrued interest | 44,016 | 36,248
Unrealized derivatives |  | 4,471
Total current liabilities | 504,376 | 455,143
Bank debt | 309,000 | 739,000
Subordinated notes | 2,639,835 | 2,139,185
Deferred tax liability | 735,166 | 698,302
Unrealized derivatives |  | 3,463
Deferred compensation liability | 207,906 | 187,604
Asset retirement obligations and other liabilities | 148,116 | 148,646
Total liabilities | 4,544,399 | 4,371,343
Commitments and contingencies |  |
Stockholders’ Equity |  |
Preferred stock, $1 par, 10,000,000 shares authorized, none issued and outstanding |  |
Common stock, $0.01 par, 475,000,000 shares authorized,163,395,396 issued at June 30, 2013 and 162,641,896 issued at December 31, 2012 | 1,634 | 1,626
Common stock held in treasury, 101,301 shares at June 30, 2013 and 127,798 shares at December 31, 2012 | (3,751) | (4,760)
Additional paid-in capital | 1,934,706 | 1,915,627
Retained earnings | 416,306 | 360,990
Accumulated other comprehensive income | 36,888 | 83,909
Total stockholders’ equity | 2,385,783 | 2,357,392
Total liabilities and stockholders’ equity | $ 6,930,182 | $ 6,728,735

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