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CONDENSED CONSOLIDATED BALANCE SHEET (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Current assets |  |
Cash and cash equivalents | $ 47,277 | $ 30,736
Accounts receivable, net | 204,970 | 172,419
Income taxes receivable | 7,273 |
Inventories | 18,276 | 14,173
Deferred income taxes | 50,864 |
Derivative instruments | 69,644 | 50,824
Other current assets | 4,889 | 2,158
Total current assets | 403,193 | 270,310
Properties and equipment, net (Successful efforts method) | 4,558,207 | 4,310,977
Derivative instruments | 17,963 |
Other assets | 38,573 | 35,026
TOTAL ASSETS | 5,017,936 | 4,616,313
Current liabilities |  |
Accounts payable | 356,851 | 312,480
Current portion of long-term debt | 75,000 | 75,000
Accrued liabilities | 58,571 | 49,789
Income taxes payable | 3,969 | 1,667
Deferred income taxes |  | 5,203
Total current liabilities | 494,391 | 444,139
Postretirement benefits | 40,313 | 38,864
Long-term debt | 1,067,000 | 1,012,000
Deferred income taxes | 1,015,493 | 882,672
Asset retirement obligation | 68,390 | 67,016
Other liabilities | 46,108 | 40,175
Total liabilities | 2,731,695 | 2,484,866
Commitments and contingencies |  |
Stockholders' equity |  |
Common stock: Authorized -- 480,000,000 shares of $0.10 par value in 2013 and 2012, respectively Issued--210,758,335 shares and 210,429,731 shares in 2013 and 2012, respectively | 21,076 | 21,043
Additional paid-in capital | 725,156 | 716,609
Retained earnings | 1,496,795 | 1,373,264
Accumulated other comprehensive income / (loss) | 46,563 | 23,880
Less treasury stock, at cost: 404,400 shares in 2013 and 2012, respectively | (3,349) | (3,349)
Total stockholders' equity | 2,286,241 | 2,131,447
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | $ 5,017,936 | $ 4,616,313

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