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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 17,825 | $ 23,946
Accounts receivable, net of allowance for doubtful accounts of $6,540 and $4,887 at March 31, 2012 and December 31, 2011, respectively | 559,548 | 518,109
Inventory | 28,585 | 31,306
Deferred tax assets, net | 116,543 | 142,725
Other | 44,903 | 48,864
Total current assets | 767,404 | 764,950
Property and equipment, net | 3,308,263 | 3,167,266
Goodwill and intangible assets | 174,546 | 175,573
Deposits on equipment purchases | 97,643 | 99,543
Other | 15,976 | 14,569
Total assets | 4,363,832 | 4,221,901
Current liabilities: |  |
Accounts payable | 274,788 | 241,610
Federal and state income taxes payable | 8,241 | 2,473
Accrued expenses | 152,442 | 164,629
Current portion of long-term debt | 10,000 | 10,000
Total current liabilities | 445,471 | 418,712
Borrowings under revolving credit facility | 108,500 | 110,000
Other long-term debt | 380,000 | 382,500
Deferred tax liabilities, net | 808,857 | 786,632
Other | 6,529 | 7,426
Total liabilities | 1,749,357 | 1,705,270
Commitments and contingencies (see Note 11) |  |
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 183,315,514 and 183,295,350 issued and 155,827,260 and 155,807,779 outstanding at March 31, 2012 and December 31, 2011, respectively | 1,833 | 1,833
Additional paid-in capital | 846,550 | 840,731
Retained earnings | 2,368,853 | 2,279,367
Accumulated other comprehensive income | 22,013 | 19,459
Treasury stock, at cost, 27,488,254 shares and 27,487,571 shares at March 31, 2012 and December 31, 2011, respectively | (624,774) | (624,759)
Total stockholders' equity | 2,614,475 | 2,516,631
Total liabilities and stockholders' equity | $ 4,363,832 | $ 4,221,901

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