Summary of Significant Accounting Policies Restatement (Tables)

9 Months Ended

Sep. 30, 2011

Restatement [Abstract]

Consolidated Statement of Operations [Table Text Block]

Consolidated statement of operations	Three Months Ended September 30, 2010						Nine Months Ended September 30, 2010
	As previously reported			As restated			As previously reported			As restated
	(in thousands, except per share data)
Revenues	$	575,968		$	573,651		$	1,644,708		$	1,638,613
Cost of revenues	391,761			391,888			1,125,282			1,125,730
Gross profit	184,207			181,763			519,426			512,883
Operating income	61,380			58,936			147,107			140,564
Income before income taxes	43,795			41,351			99,895			93,352
Income tax (provision) benefit	(14,687		)	(13,712		)	(17,100		)	(15,152		)
Net income	29,108			27,639			82,795			78,200
Earnings per common share - Basic	$	0.72		$	0.68		$	2.05		$	1.94
Earnings per common share - Diluted	$	0.71		$	0.68		$	2.02		$	1.91

Consolidated Balance Sheet [Table Text Block]

Consolidated balance sheet	September 30, 2010
	As previously reported		As restated
	(in thousands)
Accounts receivable, net	383,814		383,431
Deferred tax assets noncurrent, net	49,612		51,560
Long-term warranty	24,993		25,441
Other long-term obligations	68,417		74,167
Accumulated other comprehensive loss, net	(1,688	)	(1,726	)
Retained earnings	113,045		108,450

Consolidated Statement of Cash Flow [Table Text Block]

Consolidated statement of cash flow	Nine Months Ended September 30, 2010
	As previously reported			As restated
	(in thousands)
Operating activities
Net income	$	82,795		$	78,200
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred taxes, net	711			(1,237		)
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable	(53,770		)	(53,425		)
Unearned revenue	(8,564		)	(2,814		)
Warranty	16,087			16,535