| 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 |
|
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| 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 |
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