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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