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Consolidated Condensed Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 257,746 $ 249,509
Accounts receivable, net of allowance for doubtful accounts of $3,675 and $3,674 at March 31, 2014 and December 31, 2013, respectively 485,925 451,517
Inventory 22,663 21,248
Deferred tax assets, net 33,852 32,952
Other 51,065 53,424
Total current assets 851,251 808,650
Property and equipment, net 3,716,572 3,635,541
Goodwill and intangible assets 166,559 167,470
Deposits on equipment purchases 57,237 52,560
Other 21,276 22,906
Total assets 4,812,895 4,687,127
Current liabilities:    
Accounts payable 263,820 173,150
Federal and state income taxes payable 24,855 10,670
Accrued expenses 159,016 160,457
Current portion of long-term debt 10,000 10,000
Total current liabilities 457,691 354,277
Long-term debt 680,000 682,500
Deferred tax liabilities, net 878,771 887,864
Other 6,763 6,489
Total liabilities 2,023,225 1,931,130
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 186,971,989 and 186,487,246 issued and 144,702,524 and 144,219,189 outstanding at March 31, 2014 and December 31, 2013, respectively 1,870 1,865
Additional paid-in capital 930,205 913,505
Retained earnings 2,727,805 2,707,439
Accumulated other comprehensive income 10,721 14,076
Treasury stock, at cost, 42,269,465 shares and 42,268,057 shares at March 31, 2014 and December 31, 2013, respectively (880,931) (880,888)
Total stockholders' equity 2,789,670 2,755,997
Total liabilities and stockholders' equity $ 4,812,895 $ 4,687,127