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Consolidated Condensed Balance Sheets (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Current assets:  
Cash and cash equivalents$ 56,885$ 13,966
Accounts receivable, trade, less allowance of $10,500 and $9,484,respectively213,505190,264
Other receivables7,67910,431
Inventories and supplies28,39916,868
Prepaid taxes, licenses and permits3,71814,934
Current deferred income taxes29,23727,829
Other current assets27,31923,407
Total current assets366,742297,699
Property and equipment1,581,1201,549,637
Less - accumulated depreciation693,694708,582
Property and equipment, net887,426841,055
Other non-current assets15,10812,798
Total assets1,269,2761,151,552
Current liabilities:  
Accounts payable67,83157,708
Insurance and claims accruals64,70271,857
Accrued payroll24,59718,838
Other current liabilities19,11920,037
Total current liabilities176,249168,440
Other long-term liabilities10,70710,380
Insurance and claims accruals, net of current portion120,250113,250
Deferred income taxes226,764190,507
Commitments and contingencies  
Stockholders' equity:  
Common stock, $0.01 par value, 200,000,000 shares authorized; 80,533,536 shares issued; 72,829,701 and 72,644,998 shares outstanding, respectively805805
Paid-in capital93,68091,872
Retained earnings790,685728,216
Accumulated other comprehensive income (loss)(4,660)(3,420)
Treasury stock, at cost; 7,703,835 and 7,888,538 shares, respectively(145,204)(148,498)
Total stockholders' equity735,306668,975
Total liabilities and stockholders' equity$ 1,269,276$ 1,151,552