Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2011

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

The following is a summary of quarterly financial data (in thousands except per share data):

	2011
Three Months Ended	March 31		June 30		September 30		December 31
Revenues	$	1,234,351	$	1,270,949	$	1,279,731	$	1,370,953
Net income	116,487		83,082		77,308		117,926
Net income per share(1)
Basic	0.83		0.59		0.56		0.86
Diluted	0.79		0.56		0.53		0.82

	2010
Three Months Ended	March 31		June 30		September 30		December 31
Revenues	$	1,153,547	$	1,163,068	$	1,176,112	$	1,231,342
Net income	118,610		110,207		93,619		126,851
Net income per share(1)
Basic	0.77		0.73		0.64		0.88
Diluted	0.74		0.70		0.61		0.85

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(1) Net income per share (“EPS”) in each quarter is computed using the weighted-average number of shares outstanding during that quarter, while EPS for the full year is computed using the weighted-average number of shares outstanding during the year. Thus, the sum of the four quarters EPS does not necessarily equal the full-year EPS.