Net Income Per Share Disclosures (Tables)

12 Months Ended

Dec. 31, 2011

Net Income Per Share Disclosures [Abstract]

Reconciliation Of Numerator And Denominator Of Basic And Diluted Net Income Per Share

	Year ended December 31,
	2011		2010		2009
Numerator—basic and diluted net income per share:
Net income	$	135,814	$	68,409	$	49,879
Denominator—basic net income per share:
Weighted average common stock outstanding		176,426		170,662		167,999
Total shares used in calculation of basic net income per share		176,426		170,662		167,999
Basic net income per share	$	0.77	$	0.40	$	0.30
Denominator—diluted net income per share:
Denominator—shares used in calculation of basic net income per share		176,426		170,662		167,999
Effect of dilutive securities:
Common stock options and performance shares		4,769		5,708		3,119
Total shares used in calculation of diluted net income per share		181,195		176,370		171,118
Diluted net income per share	$	0.75	$	0.39	$	0.29