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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Current assets:    
Cash and cash equivalents $ 23,946 $ 27,612
Accounts receivable, net of allowance for doubtful accounts of $4,887 and $5,114 at December 31, 2011 and 2010, respectively 518,109 337,167
Federal and state income taxes receivable   75,062
Inventory 31,306 17,215
Deferred tax assets, net 142,725 26,815
Assets held for sale   23,370
Other 48,864 50,169
Total current assets 764,950 557,410
Property and equipment, net 3,167,266 2,620,900
Goodwill and intangible assets 175,573 179,683
Deposits on equipment purchases 99,543 51,084
Other 14,569 13,954
Total assets 4,221,901 3,423,031
Current liabilities:    
Accounts payable 241,610 162,400
Federal and state income taxes payable 2,473  
Accrued expenses 164,629 147,315
Current portion of long-term debt 10,000 6,250
Total current liabilities 418,712 315,965
Borrowings under revolving credit facility 110,000  
Other long-term debt 382,500 392,500
Deferred tax liabilities, net 786,632 511,422
Other 7,426 15,537
Total liabilities 1,705,270 1,235,424
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 183,295,350 and 181,537,568 issued and 155,807,779 and 154,193,754 outstanding at December 31, 2011 and 2010, respectively 1,833 1,815
Additional paid-in capital 840,731 796,641
Retained earnings 2,279,367 1,987,999
Accumulated other comprehensive income 19,459 21,597
Treasury stock, at cost, 27,487,571 shares and 27,343,814 shares at December 31, 2011 and 2010, respectively (624,759) (620,445)
Total stockholders' equity 2,516,631 2,187,607
Total liabilities and stockholders' equity $ 4,221,901 $ 3,423,031