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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 348 | $ 252
Accounts receivable, less allowance for doubtful accounts of $2,494 and $2,374 | 179,667 | 167,495
Derivative assets | 4,421 | 137,552
Deferred tax assets | 51,414 | 0
Inventory and other | 12,451 | 22,315
Total current assets | 248,301 | 327,614
Derivative assets | 9,233 | 15,715
Equity method investments | 129,034 | 132,449
Natural gas and oil properties, successful efforts method | 9,032,881 | 8,111,775
Accumulated depletion and depreciation | (2,274,444) | (2,015,591)
Natural gas and oil properties, successful efforts method, net | 6,758,437 | 6,096,184
Transportation and field assets | 118,625 | 117,717
Accumulated depreciation and amortization | (85,841) | (76,150)
Transportation and field assets, net | 32,784 | 41,567
Other assets | 121,297 | 115,206
Total assets | 7,299,086 | 6,728,735
Current liabilities: |  |
Accounts payable | 258,431 | 234,651
Asset retirement obligations | 5,037 | 2,470
Accrued liabilities | 161,520 | 139,379
Deferred tax liability |  | 37,924
Accrued interest | 44,375 | 36,248
Derivative liabilities | 26,198 | 4,471
Total current liabilities | 495,561 | 455,143
Bank debt | 500,000 | 739,000
Subordinated notes | 2,640,516 | 2,139,185
Deferred tax liability | 771,980 | 698,302
Derivative liabilities | 25 | 3,463
Deferred compensation liability | 247,537 | 187,604
Asset retirement obligations and other liabilities | 229,015 | 148,646
Total liabilities | 4,884,634 | 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, 163,441,414 issued at December 31, 2013 and 162,641,896 issued at December 31, 2012 | 1,634 | 1,626
Common stock held in treasury, 98,520 shares at December 31, 2013 and 127,798 shares at December 31, 2012 | (3,637) | (4,760)
Additional paid-in capital | 1,959,636 | 1,915,627
Retained earnings | 450,583 | 360,990
Accumulated other comprehensive income | 6,236 | 83,909
Total stockholders' equity | 2,414,452 | 2,357,392
Total liabilities and stockholders' equity | $ 7,299,086 | $ 6,728,735

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 + Details
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