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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands
6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 139,291 $ 96,401
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization of trademark 24 24
Depreciation and other amortization 7,671 5,450
(Gain) loss on disposal of property and equipment (108) 155
Stock-based compensation 7,894 8,513
Gain on put options (323) (4,100)
Loss on investments, net 374 4,238
Deferred income taxes   2,584
Tax benefit from exercise of stock options (1,144) (6,644)
Provision for doubtful accounts 53 1,265
Effect on cash of changes in operating assets and liabilities:    
Accounts receivable (61,262) (25,336)
Distributor receivables (260) 783
Inventories (2,452) (32,757)
Prepaid expenses and other current assets (2,851) (3,805)
Prepaid income taxes 9,737  
Accounts payable 14,943 40,231
Accrued liabilities 8,162 20,480
Accrued distributor terminations (393) (424)
Accrued compensation (1,807) (1,636)
Income taxes payable 9,028 25,176
Deferred revenue (2,611) (3,875)
Net cash provided by operating activities 123,966 126,723
CASH FLOWS FROM INVESTING ACTIVITIES:    
Maturities of held-to-maturity investments 182,317 59,987
Sales of available-for-sale investments 22,657 8,500
Sales of trading investments 14,600 600
Purchases of held-to-maturity investments (228,249) (89,969)
Purchases of available-for-sale investments (11,874)  
Purchases of property and equipment (12,311) (4,384)
Proceeds from sale of property and equipment 289 47
Additions to intangibles (3,385) (6,264)
Decrease in other assets 1,025 335
Net cash used in investing activities (34,931) (31,148)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on debt (696) (239)
Tax benefit from exercise of stock options 1,144 6,644
Issuance of common stock 11,308 5,021
Purchases of common stock held in treasury (38,862) (23,540)
Net cash used in financing activities (27,106) (12,114)
Effect of exchange rate changes on cash and cash equivalents 1,426 (1,899)
NET INCREASE IN CASH AND CASH EQUIVALENTS 63,355 81,562
CASH AND CASH EQUIVALENTS, beginning of period 354,842 328,349
CASH AND CASH EQUIVALENTS, end of period 418,197 409,911
Cash paid during the period for:    
Interest 31 6
Income taxes $ 63,415 $ 37,579