Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2012

Earnings Per Share

Computation of basic and diluted earnings per share

	For the Three Months ended  March 31,
	2012		2011
Numerator (basic and diluted):
Net income	$	147,492	$	102,474
Denominator:
Denominator for basic earnings per share–         weighted-average shares		126,970		140,579
Effect of stock options (1)		2,357		2,287
Denominator for diluted earnings per share - weighted-average shares		129,327		142,866
Earnings per share-basic	$	1.16	$	0.73
Earnings per share-assuming dilution	$	1.14	$	0.72

Antidilutive stock option summary

Antidilutive common stock equivalents not included in the calculation of diluted earnings per share:
Stock options (1)		907		1,377
Weighted-average exercise price per share of antidilutive stock options (1)	$	81.73	$	54.43
(1)  See Note 9 for further discussion on the terms of the Company's share-based compensation plans.