Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 173,753	$ 94,964
Short-term investments	138,147	212,526
Accounts receivable, net of allowances for doubtful accounts of $669 at June 30, 2012 and $725 at December 31, 2011	72,666	55,351
Inventories	35,977	34,778
Deferred income taxes	6,170	11,563
Prepaid expenses and other current assets	48,152	43,867
Total current assets	474,865	453,049
Long-term investments	11,028	17,477
Property and equipment, net	23,468	25,141
Goodwill	115,489	115,489
Other intangible assets, net	55,447	60,005
Other assets, net	40,977	34,830
Total assets	721,274	705,991
Current liabilities:
Accounts payable	36,383	26,354
Accrued expenses	30,955	30,857
Deferred income on shipments to distributors	26,334	24,962
Income taxes	707	665
Total current liabilities	94,379	82,838
Long-term obligations and other liabilities	9,700	24,214
Total liabilities	104,079	107,052
Commitments and contingencies
Stockholders' equity:
Preferred stock--$0.0001 par value; 10,000 shares authorized; no shares issued and outstanding
Common stock--$0.0001 par value; 250,000 shares authorized; 41,941 and 42,068 shares issued and outstanding at June 30, 2012 and December 31, 2011, respectively	4	4
Additional paid-in capital		14,749
Retained earnings	618,839	586,653
Accumulated other comprehensive loss	(1,648)	(2,467)
Total stockholders' equity	617,195	598,939
Total liabilities and stockholders' equity	$ 721,274	$ 705,991