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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash flows from operating activities: |  |  |
Net income | $ 221,645 | $ 153,330 | $ 136,051
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 33,412 | 32,850 | 29,616
Japan customs expense | 0 | 32,754 | 0
Foreign currency (gains)/losses | (3,874) | 4,162 | 3,681
Stock-based compensation | 21,358 | 15,450 | 10,835
Deferred taxes | 4,692 | 108 | (13,735)
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (7,884) | (5,890) | (6,649)
Inventories, net | (22,605) | 2,415 | (4,293)
Prepaid expenses and other | (2,358) | (4,690) | 3,854
Other assets | (11,579) | (16,809) | (1,631)
Accounts payable | 15,831 | 6,077 | (568)
Accrued expenses | 62,056 | 1,624 | 13,777
Other liabilities | 282 | 2,934 | 16,945
Net cash provided by operating activities | 310,976 | 224,315 | 187,883
Cash flows from investing activities: |  |  |
Purchase of property and equipment | (96,645) | (41,809) | (53,783)
Proceeds on investment sales | 20,086 | 6,634 | 0
Purchases of investments | (15,737) | (24,361) | 0
Acquisitions (Note 24)) | (12,562) | (11,663) | 0
Net cash used in investing activities | (104,858) | (71,199) | (53,783)
Cash flows from financing activities: |  |  |
Payment of cash dividends | (48,374) | (36,638) | (31,189)
Repurchase of shares of common stock | (201,471) | (67,149) | (58,516)
Exercise of distributor and employee stock options | 4,565 | 29,713 | 21,181
Income tax benefit of options exercised | 7,750 | 12,059 | 6,908
Payments on long-term debt | (28,279) | (28,001) | (37,401)
Related party payment | 0 | (16,995) | 0
Proceeds from long-term debt | 101,922 | 0 | 30,000
Net cash used in financing activities | (163,887) | (107,011) | (69,017)
Effect of exchange rate changes on cash | 4,820 | (3,468) | 7,209
Net increase in cash and cash equivalents | 47,051 | 42,637 | 72,292
Cash and cash equivalents, beginning of period | 272,974 | 230,337 | 158,045
Cash and cash equivalents, end of period | $ 320,025 | $ 272,974 | $ 230,337

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