Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2011

Earnings Per Share [Abstract]

Earnings per share table

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2011		2010		2011		2010
Basic net income per share:
Net income	$	44,294	$	67,213	$	114,771	$	109,395
Weighted average number of common shares outstanding		48,419,556		50,296,209		48,342,756		50,422,564
Basic net income per share	$	0.91	$	1.34	$	2.37	$	2.17
Diluted net income per share:
Net income	$	44,294	$	67,213	$	114,771	$	109,395
Weighted average number of common shares outstanding		48,419,556		50,296,209		48,342,756		50,422,564
Dilutive effect of stock options and non-vested stock awards		1,764,664		1,021,835		1,813,532		813,375
Dilutive effect of assumed conversion of the 2.0% Convertible Senior Notes		2,196,048		—		1,818,377		—
Dilutive effect of warrants		1,161,100		—		683,638		—
Weighted average number of common shares and dilutive potential common shares outstanding		53,541,368		51,318,044		52,658,303		51,235,939
Diluted net income per share	$	0.83	$	1.31	$	2.18	$	2.14