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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 | $ 68,098 | $ 69,869 | $ 61,381
Adjustments to reconcile net income to net cash provided by operations: |  |  |
Stock-based compensation expense | 8,520 | 8,068 | 3,027
Depreciation of property, plant, and equipment | 6,721 | 5,529 | 4,685
Amortization of intangible assets | 4,137 | 4,227 | 5,124
Amortization of discounts or premiums on investments | 5,735 | 6,383 | 3,195
Realized (gain) loss on sale of investments | (1,625) | 181 | (10)
Change in deferred income taxes | 429 | (425) | 1,034
Tax effect of stock option exercises | (3,594) | (4,045) | (1,941)
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 5,035 | (2,031) | (14,535)
Inventories | 1,872 | (5,743) | (6,190)
Accrued expenses | (1,974) | 2,747 | 10,134
Accrued income taxes | 3,363 | (2,865) | 9,567
Deferred revenue and customer deposits | (761) | 3,316 | (4,740)
Return of Japan tax deposit (Note 15) |  |  | 9,336
Other | 5,175 | 1,064 | (3,734)
Net cash provided by operating activities | 101,131 | 86,275 | 76,333
Cash flows from investing activities: |  |  |
Purchases of investments | (460,486) | (323,946) | (253,867)
Maturities and sales of investments | 431,510 | 241,557 | 82,928
Purchases of property, plant, and equipment | (9,878) | (7,820) | (5,852)
Cash received related to discontinued business |  |  | 315
Net cash used in investing activities | (38,854) | (90,209) | (176,476)
Cash flows from financing activities: |  |  |
Issuance of common stock under stock option plans | 17,468 | 30,863 | 28,384
Payment of dividends | (66,213) | (15,114) | (10,014)
Repurchase of common stock |  | (10,000) |
Stock option buyback |  |  | (83)
Tax effect of stock option exercises | 3,594 | 4,045 | 1,941
Net cash provided by (used in) financing activities | (45,151) | 9,794 | 20,228
Effect of foreign exchange rate changes on cash and cash equivalents | (10,069) | (960) | (6,713)
Net change in cash and cash equivalents | 7,057 | 4,900 | (86,628)
Cash and cash equivalents at beginning of year | 38,103 | 33,203 | 119,831
Cash and cash equivalents at end of year | $ 45,160 | $ 38,103 | $ 33,203

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