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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 177,980 $ 163,877
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 11,183 9,024
Loss (gain) on disposal of property and equipment (268) 46
Stock-based compensation 13,142 10,062
Deferred income taxes 1,862 9
Effect on cash of changes in operating assets and liabilities :    
Accounts receivable 7,441 (58,550)
Distributor receivables (951) (1,656)
Inventories (7,793) (7,639)
Prepaid expenses and other current assets (11,368) (12,841)
Prepaid income taxes 25,601 (10,535)
Accounts payable (19,317) 36,086
Accrued liabilities 6,788 12,239
Accrued promotional allowances 14,111 13,136
Accrued distributor terminations 315 (2,853)
Accrued compensation (15,802) (9,147)
Income taxes payable (5,506) (34,791)
Deferred revenue (4,454) 3,092
Net cash provided by operating activities 192,964 109,559
CASH FLOWS FROM INVESTING ACTIVITIES:    
Maturities of held-to-maturity investments   396,346
Sales of available-for-sale investments 71,553  
Purchases of held-to-maturity investments   (152,050)
Purchases of available-for-sale investments (58,314)  
Purchases of property and equipment (19,093) (8,205)
Proceeds from sale of property and equipment 452 381
Increase in intangibles (848) (2,342)
Decrease (increase) in other assets (52) 142
Net cash (used in) provided by investing activities (6,302) 234,272
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on debt (700) (522)
Issuance of common stock 13,621 4,078
Purchases of common stock held in treasury (64) (2,016)
Net cash provided by financing activities 12,857 1,540
Effect of exchange rate changes on cash and cash equivalents (764) 7,321
NET INCREASE IN CASH AND CASH EQUIVALENTS 198,755 352,692
CASH AND CASH EQUIVALENTS, beginning of period 377,582 377,582
CASH AND CASH EQUIVALENTS, end of period 576,337 2,528,109
Cash paid during the period for:    
Interest 19 16
Income taxes $ 66,094 $ 137,186