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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Current assets: |  |
Cash and cash equivalents | $ 75,299 | $ 23,946
Accounts receivable, net of allowance for doubtful accounts of $4,734 and $4,887 at June 30, 2012 and December 31, 2011, respectively | 528,808 | 518,109
Federal and state income taxes receivable | 1,905 |
Inventory | 27,390 | 31,306
Deferred tax assets, net | 81,932 | 142,725
Other | 45,231 | 48,864
Total current assets | 760,565 | 764,950
Property and equipment, net | 3,402,413 | 3,167,266
Goodwill and intangible assets | 173,518 | 175,573
Deposits on equipment purchases | 88,573 | 99,543
Other | 17,546 | 14,569
Total assets | 4,442,615 | 4,221,901
Current liabilities: |  |
Accounts payable | 224,917 | 241,610
Federal and state income taxes payable |  | 2,473
Accrued expenses | 153,382 | 164,629
Current portion of long-term debt |  | 10,000
Total current liabilities | 378,299 | 418,712
Borrowings under revolving credit facility |  | 110,000
Other long-term debt | 600,000 | 382,500
Deferred tax liabilities, net | 828,415 | 786,632
Other | 6,618 | 7,426
Total liabilities | 1,813,332 | 1,705,270
Commitments and contingencies (see Note 10) |  |
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 184,053,434 and 183,295,350 issued and 151,773,850 and 155,807,779 outstanding at June 30, 2012 and December 31, 2011, respectively | 1,840 | 1,833
Additional paid-in capital | 850,951 | 840,731
Retained earnings | 2,453,741 | 2,279,367
Accumulated other comprehensive income | 18,847 | 19,459
Treasury stock, at cost, 32,279,584 shares and 27,487,571 shares at June 30, 2012 and December 31, 2011, respectively | (696,096) | (624,759)
Total stockholders' equity | 2,629,283 | 2,516,631
Total liabilities and stockholders' equity | $ 4,442,615 | $ 4,221,901

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