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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Current assets:    
Cash and cash equivalents $ 83,473 $ 23,946
Accounts receivable, net of allowance for doubtful accounts of $4,614 and $4,887 at September 30, 2012 and December 31, 2011, respectively 470,786 518,109
Federal and state income taxes receivable 764  
Inventory 25,709 31,306
Deferred tax assets, net 71,288 142,725
Other 43,215 48,864
Total current assets 695,235 764,950
Property and equipment, net 3,522,904 3,167,266
Goodwill and intangible assets 172,491 175,573
Deposits on equipment purchases 54,781 99,543
Other 24,564 14,569
Total assets 4,469,975 4,221,901
Current liabilities:    
Accounts payable 215,516 241,610
Federal and state income taxes payable   2,473
Accrued expenses 156,679 164,629
Current portion of long-term debt   10,000
Total current liabilities 372,195 418,712
Borrowings under revolving credit facility   110,000
Other long-term debt 600,000 382,500
Deferred tax liabilities, net 846,926 786,632
Other 6,686 7,426
Total liabilities 1,825,807 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 184,021,577 and 183,295,350 issued and 149,320,434 and 155,807,779 outstanding at September 30, 2012 and December 31, 2011, respectively 1,840 1,833
Additional paid-in capital 856,981 840,731
Retained earnings 2,497,029 2,279,367
Accumulated other comprehensive income 23,263 19,459
Treasury stock, at cost, 34,701,143 shares and 27,487,571 shares at September 30, 2012 and December 31, 2011, respectively (734,945) (624,759)
Total stockholders' equity 2,644,168 2,516,631
Total liabilities and stockholders' equity $ 4,469,975 $ 4,221,901