Nature of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Warranty Expense and Write-off Activity

A summary of warranty expense and write-off activity for the years ended December 31, 2012 and 2011 is as follows:

Year Ended December 31,	2012			2011
(In thousands)
Balance at beginning of period	$	4,118		$	3,304
Plus: Amounts charged to cost and expenses		5,363			2,860
Amounts assumed on acquisition		3,781			33
Less: Deductions		(3,609	)		(2,079	)
Balance at end of period	$	9,653		$	4,118

Unearned Revenue

At December 31, 2012 and 2011, unearned revenue was as follows:

(In thousands)	2012		2011
Current unearned revenue	$	38,051	$	9,965
Non-current unearned revenue		23,803		4,874
Total	$	61,854	$	14,839