Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2013

Earnings Per Share [Abstract]

Schedule Of Net Income Attributable To Common Stockholders

	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
Net income	$	170,290		$	86,964		$	439,453		$	290,278
Less:
Net income attributable to participating securities	(587		)	(452		)	(1,691		)	(1,682		)
Net income attributable to common shareholders	$	169,703		$	86,512		$	437,762		$	288,596

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 September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Weighted average common shares—basic	66,628,747		66,311,958		66,628,027		66,240,225
Plus incremental shares from:
Assumed exercise of options	276,807		344,802		275,352		381,295
Weighted average common shares—diluted	66,905,554		66,656,760		66,903,379		66,621,520
Earnings per share:
Basic	$	2.55	$	1.30	$	6.57	$	4.36
Diluted	$	2.54	$	1.30	$	6.54	$	4.33