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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Current assets:    
Cash and cash equivalents $ 64,584 $ 27,612
Accounts receivable, net of allowance for doubtful accounts of $4,878 and $5,114 at June 30, 2011 and December 31, 2010, respectively 406,247 337,167
Federal and state income taxes receivable 1,310 75,062
Inventory 23,486 17,215
Deferred tax assets, net 75,796 26,815
Assets held for sale   23,370
Other 58,727 50,169
Total current assets 630,150 557,410
Property and equipment, net 2,890,668 2,620,900
Goodwill and intangible assets 177,628 179,683
Deposits on equipment purchases 66,303 51,084
Other 12,840 13,954
Total assets 3,777,589 3,423,031
Current liabilities:    
Accounts payable 230,495 162,400
Accrued expenses 158,258 147,315
Current portion of long-term debt 8,750 6,250
Total current liabilities 397,503 315,965
Long-term debt 387,500 392,500
Deferred tax liabilities, net 630,737 511,422
Other 10,789 15,537
Total liabilities 1,426,529 1,235,424
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 183,043,921 and 181,537,568 issued and 155,561,314 and 154,193,754 outstanding at June 30, 2011 and December 31, 2010, respectively 1,830 1,815
Additional paid-in capital 824,725 796,641
Retained earnings 2,125,409 1,987,999
Accumulated other comprehensive income 23,757 21,597
Treasury stock, at cost, 27,482,607 shares and 27,343,814 shares at June 30, 2011 and December 31, 2010, respectively (624,661) (620,445)
Total stockholders' equity 2,351,060 2,187,607
Total liabilities and stockholders' equity $ 3,777,589 $ 3,423,031