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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Statement [Abstract]    
Revenues $ 425,821 $ 502,557
Cost of revenues 268,227 273,799
Selling, general and administrative expenses 44,914 44,927
Depreciation and amortization 52,821 51,570
Loss on disposition of assets, net 2,640 1,404
Operating profit 57,219 130,857
Interest expense (340) (596)
Interest income 5 5
Other income, net 555 920
Income before income taxes 57,439 131,186
Income tax provision 22,363 50,431
Net income $ 35,076 $ 80,755
Earnings per share    
Basic (in dollars per share) $ 0.16 $ 0.37
Diluted (in dollars per share) $ 0.16 $ 0.37
Dividends per share (in dollars per share) $ 0.10 $ 0.08
Average shares outstanding    
Basic (in shares) 216,194 215,620
Diluted (in shares) 217,525 217,350