Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2012

Schedule Of Net Income Attributable To Common Stockholders

	Three Months Ended June 30,						Six Months Ended June 30,
	2012			2011			2012			2011
Net income	$	115,501		$	81,049		$	203,314		$	164,593
Less:
Net income attributable to participating securities		(606	)		(715	)		(1,240	)		(1,492	)
Net income attributable to common shareholders	$	114,895		$	80,334		$	202,074		$	163,101

Reconciliation Of Denominator For Basic And Diluted Earnings Per Share

The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Weighted average common shares—basic		66,298,633		65,999,090		66,203,965		65,873,023
Plus incremental shares from:
Assumed exercise of options		350,263		425,975		399,741		396,800
Weighted average common shares—diluted		66,648,896		66,425,065		66,603,706		66,269,823
Earnings per share:
Basic	$	1.73	$	1.22	$	3.05	$	2.48
Diluted	$	1.72	$	1.21	$	3.03	$	2.46