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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net income $ 239,617 $ 162,412
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 24,026 25,228
Foreign currency (gains)/losses 1,663 (224)
Stock-based compensation 23,004 16,256
Deferred taxes 3,163 2,026
Changes in operating assets and liabilities:    
Accounts receivable (16,073) (10,435)
Inventories, net (120,153) (23,492)
Prepaid expenses and other (42,059) 3,515
Other assets (13,237) (10,419)
Accounts payable 21,652 8,306
Accrued expenses 355,190 57,725
Other liabilities 7,350 8,352
Net cash provided by operating activities 484,143 239,250
Cash flows from investing activities:    
Purchases of property and equipment (143,068) (64,467)
Proceeds of investment sales 13,148 16,999
Purchases of investments (11,869) (15,075)
Net cash used in investing activities (141,789) (62,543)
Cash flows from financing activities:    
Exercise of employee stock options 18,361 2,591
Payment of debt (23,902) (26,279)
Payment of cash dividends (52,891) (36,626)
Income tax benefit of options exercised 16,687 6,845
Proceeds from debt 35,000 100,006
Repurchases of shares of common stock (90,866) (179,608)
Net cash used in financing activities (97,611) (133,071)
Effect of exchange rate changes on cash (11,269) 5,319
Net increase in cash and cash equivalents 233,474 48,955
Cash and cash equivalents, beginning of period 320,025 272,974
Cash and cash equivalents, end of period $ 553,499 $ 321,929