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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