Operations And Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Operations And Summary Of Significant Accounting Policies [Abstract]

Schedule Of Allowance For Doubtful Accounts And Sales Returns

			Balance at								Balance at
			Beginning								End of
Year	Description		of Period		Provisions			Write-Offs			Period
2009	Allowance for doubtful accounts and sales returns	$	5,682	$	337		$	1,400		$	4,619
2010	Allowance for doubtful accounts and sales returns	$	4,619	$	(578	)	$	273		$	3,768
2011	Allowance for doubtful accounts and sales returns	$	3,768	$	385		$	(88	)	$	4,241

Adjustment For Excess And Obsolete Inventories

			Balance at						Balance at
			Beginning						End of
Year	Description		of Period		Provisions		Write-Offs		Period
2009	Adjustment for excess and obsolete inventories	$	4,409	$	1,492	$	1,511	$	4,390
2010	Adjustment for excess and obsolete inventories	$	4,390	$	1,785	$	2,835	$	3,340
2011	Adjustment for excess and obsolete inventories	$	3,340	$	3,554	$	2,689	$	4,205

Schedule Of Warranty Reserve

		2011			2010			2009
Balance at the beginning of the period	$	921		$	921		$	952
Accruals for warranties issued during the period		2,954			1,993			1,991
Settlements made (in cash or in kind) during the period		(2,604	)		(1,993	)		(2,022	)
Balance at the end of the period	$	1,271		$	921		$	921

Reconciliation Of The Denominators Used To Calculate Basic And Diluted EPS

	Years Ended December 31,
	2011	2010	2009
Weighted average shares outstanding-basic	119,836	116,973	116,280
Plus: Common share equivalents
Stock options, restricted stock units	1,384	1,599	759
Weighted average shares outstanding-diluted	121,220	118,572	117,039