Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 271,675	$ 266,302
Short-term investments in marketable securities	97,590	79,532
Short-term restricted cash	14,257	14,522
Receivables, net of allowances for doubtful accounts of $2,497 and $2,718	215,833	211,160
Inventories	185,254	192,540
Deferred tax assets	11,760	12,245
Other current assets	31,004	29,332
Total current assets	827,373	805,633
Non-current investments in marketable securities	28,190	29,179
Long-term restricted cash	29,936	27,425
Property, plant and equipment, net of accumulated depreciation of $119,665 and $121,560	103,743	109,872
Intangible assets, net of accumulated amortization of $12,924 and $10,984	48,806	51,499
Goodwill	128,172	131,320
Deferred tax assets	829	5,092
Non-current inventories	63,564	65,116
Other assets, net	8,891	9,087
Total Assets	1,239,504	1,234,223
Current liabilities:
Accounts payable	55,390	54,847
Accrued payroll liabilities	30,966	39,100
Accrued warranty reserves	12,280	12,049
Accrued agent commissions	7,029	8,124
Short-term deferred revenue	83,699	74,736
Income taxes payable	1,952	1,343
Accrued restructuring, reorganization, relocation and severance	2,796	2,692
Convertible debt	89,010	89,010
Other current liabilities	36,527	36,902
Total current liabilities	319,649	318,803
Long-term deferred revenue	26,682	26,668
Deferred tax liabilities	11,391	17,588
Other liabilities	29,034	31,261
Commitments and contingencies
Shareholders' Equity:
Preferred stock - 500 shares authorized; none issued and outstanding	0	0
Common stock - 70,000 shares authorized; 38,567 and 38,478 shares issued and outstanding, no par value	523,387	516,907
Retained earnings	308,130	284,440
Accumulated other comprehensive income	21,231	38,556
Total Shareholders' Equity	852,748	839,903
Total Liabilities and Shareholders' Equity	$ 1,239,504	$ 1,234,223