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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net income $ 74,361 $ 128,717
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 24,965 15,527
Foreign currency (gains)/losses 48,264 863
Stock-based compensation 13,726 11,411
Deferred taxes 3,871 (2,901)
Changes in operating assets and liabilities:    
Accounts receivable 27,121 (24,647)
Inventories, net (54,218) (45,228)
Prepaid expenses and other (31,157) (25,515)
Other assets (14,797) (10,987)
Accounts payable (46,503) 3,593
Accrued expenses (233,532) 132,787
Other liabilities 3,034 5,237
Net cash provided by operating activities (184,865) 188,857
Cash flows from investing activities:    
Purchases of property and equipment (57,136) (82,515)
Proceeds of investment sales 22,011 9,701
Purchases of investments (13,655) (5,077)
Net cash used in investing activities (48,780) (77,891)
Cash flows from financing activities:    
Exercise of employee stock options (2,656) 7,359
Payment of debt (39,915) (13,890)
Payment of cash dividends (40,511) (35,140)
Income tax benefit of options exercised 9,267 7,309
Proceeds from debt 65,680 35,000
Repurchases of shares of common stock (25,002) (14,615)
Net cash used in financing activities (33,137) (13,977)
Effect of exchange rate changes on cash (38,870) (14,336)
Net increase in cash and cash equivalents (305,652) 82,653
Cash and cash equivalents, beginning of period 525,153 320,025
Cash and cash equivalents, end of period $ 219,501 $ 402,678