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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 110,723 | $ 23,946
Accounts receivable, net of allowance for doubtful accounts of $3,513 and $4,887 at December 31, 2012 and 2011, respectively | 465,517 | 518,109
Inventory | 26,889 | 31,306
Deferred tax assets, net | 52,959 | 142,725
Other | 43,903 | 48,864
Total current assets | 699,991 | 764,950
Property and equipment, net | 3,615,383 | 3,167,266
Goodwill and intangible assets | 171,463 | 175,573
Deposits on equipment purchases | 43,776 | 99,543
Other | 26,298 | 14,569
Total assets | 4,556,911 | 4,221,901
Current liabilities: |  |
Accounts payable | 188,823 | 241,610
Federal and state income taxes payable | 6,158 | 2,473
Accrued expenses | 158,632 | 164,629
Current portion of long-term debt | 6,250 | 10,000
Total current liabilities | 359,863 | 418,712
Borrowings under revolving credit facility |  | 110,000
Other long-term debt | 692,500 | 382,500
Deferred tax liabilities, net | 857,302 | 786,632
Other | 6,589 | 7,426
Total liabilities | 1,916,254 | 1,705,270
Commitments and contingencies (see Note 9) |  |
Stockholders' equity: |  |
Preferred stock, par value $.01; authorized 1,000,000 shares, no shares issued |  |
Common stock, par value $.01; authorized 300,000,000 shares with 184,059,900 and 183,295,350 issued and 145,913,162 and 155,807,779 outstanding at December 31, 2012 and 2011, respectively | 1,841 | 1,833
Additional paid-in capital | 863,558 | 840,731
Retained earnings | 2,548,542 | 2,279,367
Accumulated other comprehensive income | 21,767 | 19,459
Treasury stock, at cost, 38,146,738 shares and 27,487,571 shares at December 31, 2012 and 2011, respectively | (795,051) | (624,759)
Total stockholders' equity | 2,640,657 | 2,516,631
Total liabilities and stockholders' equity | $ 4,556,911 | $ 4,221,901

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