Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Apr. 01, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 252,277	$ 320,361
Short-term investments in marketable securities	60,061	16,213
Short-term restricted cash	18,434	22,564
Receivables, net of allowances for doubtful accounts of $5,727 and $5,553	216,704	185,955
Inventories	194,051	182,010
Deferred tax assets	17,344	18,899
Other current assets	31,578	27,964
Total current assets	790,449	773,966
Non-current investments in marketable securities	33,010	53,341
Long-term restricted cash	32,611	43,669
Property, plant and equipment, net of accumulated depreciation of $111,101 and $106,760	96,711	85,082
Goodwill	80,503	58,053
Deferred tax assets	1,618	934
Non-current inventories	61,687	57,575
Other assets, net	25,849	17,289
Total Assets	1,122,438	1,089,909
Current liabilities:
Accounts payable	58,039	52,470
Accrued payroll liabilities	26,657	46,698
Accrued warranty reserves	11,902	11,683
Accrued agent commissions	11,930	9,005
Short-term deferred revenue	75,359	72,730
Income taxes payable	10,802	11,260
Accrued restructuring, reorganization, relocation and severance	2,265	2,213
Other current liabilities	47,600	48,623
Total current liabilities	244,554	254,682
Convertible debt	89,011	89,011
Long-term deferred revenue	23,819	23,423
Deferred tax liabilities	8,717	6,607
Other liabilities	14,430	19,372
Commitments and contingencies
Shareholders' Equity:
Preferred stock - 500 shares authorized; none issued and outstanding	0	0
Common stock - 70,000 shares authorized; 37,935 and 37,866 shares issued and outstanding, no par value	496,644	493,698
Retained earnings	204,328	178,661
Accumulated other comprehensive income	40,935	24,455
Total Shareholders' Equity	741,907	696,814
Total Liabilities and Shareholders' Equity	$ 1,122,438	$ 1,089,909