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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