Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Summary Of Significant Accounting Policies [Abstract]

Reconciliation Of Unrecognized Tax Benefits

Balance at January 1, 2009	$	4,000
Additions based on tax positions related to 2009		0
Additions based on tax positions related to 2010		0
Additions based on tax positions related to 2011		0
Balance at December 31, 2011	$	4,000

Summary Of Accrued Warranty Obligation

	Year Ended December 31,
Warranty Reserve	2011		2010		2009
Balance at the beginning of the year	$	4,554	$	3,813	$	2,814
Warranty expense		5,856		6,427		4,629
Warranty payments		(5,797)		(5,686)		(3,630)
Balance at the end of the period	$	4,613	$	4,554	$	3,813

Compensation Expense And Related Tax Benefit For Equity-Based Payments

	For the years ended December 31,
Compensation costs and related income tax benefit:	2011		2010		2009
Cost of sales	$	1,029	$	882	$	844
Selling and marketing		1,463		1,368		1,404
Research and development		1,387		1,282		1,426
General and administration		9,228		6,580		6,315
Total compensation expense	$	13,107	$	10,112	$	9,989
Income tax benefit	$	4,522	$	3,489	$	3,446