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Selected Quarterly Consolidated Financial Data (Tables)

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Selected Quarterly Consolidated Financial Data [Abstract]

Schedule Of Selected Quarterly Consolidated Financial Data


2011		First Quarter				Second Quarter				Third Quarter				Fourth Quarter
Total revenue		$	508,083			$	578,523			$	557,396			$	505,556
Gross profit		$	140,964			$	147,796			$	145,196			$	125,071
Net income		$	49,589			$	52,259			$	71,361			$	33,698
Basic earnings per share
Net income		$	3.57			$	3.77			$	5.22			$	2.51
Diluted earnings per share
Net income		$	3.57			$	3.77			$	5.22			$	2.51
Shares used to compute basic earnings per share			13,890				13,852				13,680				13,405
Shares used to compute diluted earnings per share			13,906				13,856				13,680				13,405


2010		First Quarter				Second Quarter				Third Quarter				Fourth Quarter
Total revenue		$	395,126			$	469,841			$	471,777			$	460,648
Gross profit		$	120,408			$	132,201			$	135,922			$	126,928
Net income		$	42,138			$	39,856			$	45,719			$	49,412
Basic earnings per share
Net income		$	2.79			$	2.69			$	3.19			$	3.48
Diluted earnings per share
Net income		$	2.78			$	2.69			$	3.18			$	3.47
Shares used to compute basic earnings per share			15,118				14,796				14,353				14,209
Shares used to compute diluted earnings per share			15,154				14,828				14,383				14,235