Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2011

Selected Quarterly Financial Data [Abstract]

Schedule Of Selected Quarterly Financial Data

Fiscal Quarters Year Ended December 31, 2011	First		Second		Third		Fourth
Revenues, net	$	111,005	$	134,213	$	134,213	$	140,160
Operating income		50,487		59,892		61,723		54,232
Net income		32,335		36,715		40,514		37,771
Earnings per share:
Basic earnings per share	$	0.40	$	0.46	$	0.50	$	0.46
Diluted earnings per share		0.39		0.44		0.48		0.45
Weighted average shares outstanding:
Basic weighted average shares outstanding		79,937		80,151		80,819		81,512
Diluted weighted average shares outstanding		83,378		83,548		83,649		84,035
Fiscal Quarters Year Ended December 31, 2010	First		Second		Third		Fourth
Revenues, net	$	104,202	$	111,437	$	111,655	$	106,547
Operating income		47,100		50,557		49,062		23,774
Net income		27,345		29,640		33,398		17,513
Earnings per share:
Basic earnings per share	$	0.67	$	0.74	$	0.85	$	0.43
Diluted earnings per share		0.34		0.37		0.41		0.22
Weighted average shares outstanding:
Basic weighted average shares outstanding		34,011		33,988		34,076		39,612
Diluted weighted average shares outstanding		80,489		80,701		80,880		80,931