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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 144,031 $ 110,723
Accounts receivable, net of allowance for doubtful accounts of $3,582 and $3,513 at March 31, 2013 and December 31, 2012, respectively 491,230 465,517
Inventory 22,954 26,889
Deferred tax assets, net 42,505 52,959
Other 40,593 43,903
Total current assets 741,313 699,991
Property and equipment, net 3,682,750 3,615,383
Goodwill and intangible assets 170,435 171,463
Deposits on equipment purchases 35,913 43,776
Other 26,821 26,298
Total assets 4,657,232 4,556,911
Current liabilities:    
Accounts payable 233,576 188,823
Federal and state income taxes payable 7,261 6,158
Accrued expenses 141,517 158,632
Current portion of long-term debt 7,500 6,250
Total current liabilities 389,854 359,863
Long-term debt 690,000 692,500
Deferred tax liabilities, net 871,403 857,302
Other 6,642 6,589
Total liabilities 1,957,899 1,916,254
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 185,212,330 and 184,059,900 issued and 146,427,968 and 145,913,162 outstanding at March 31, 2013 and December 31, 2012, respectively 1,852 1,841
Additional paid-in capital 890,809 863,558
Retained earnings 2,597,460 2,548,542
Accumulated other comprehensive income 19,464 21,767
Treasury stock, at cost, 38,784,362 shares and 38,146,738 shares at March 31, 2013 and December 31, 2012, respectively (810,252) (795,051)
Total stockholders' equity 2,699,333 2,640,657
Total liabilities and stockholders' equity $ 4,657,232 $ 4,556,911