Quarterly Information (Tables)

12 Months Ended

Dec. 31, 2011

Quarterly Information [Abstract]

Summary Of Quarterly Results Of Operations

	Quarter
	First		Second		Third		Fourth
	(Amounts are in thousands, except per share amounts)
2011
Revenues		$6,836,402		6,621,633		6,425,379		7,295,350
Costs and expenses		6,264,682		6,079,262		5,978,544		6,721,351
Net earnings		398,167		382,369		311,902		399,528
Basic and diluted earnings per share		0.51		0.48		0.40		0.51
2010
Revenues		$6,548,665		6,261,831		6,086,076		6,431,482
Costs and expenses		6,024,959		5,762,828		5,676,395		5,942,548
Net earnings		364,399		348,424		283,222		342,102
Basic and diluted earnings per share		0.47		0.44		0.36		0.44