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Consolidated Statements of Cash Flows (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Cash flows from operating activities: |  |  |
Net income | $ 73,573,000 | $ 68,098,000 | $ 69,869,000
Adjustments to reconcile net income to net cash provided by operations: |  |  |
Stock-based compensation expense | 10,620,000 | 8,520,000 | 8,068,000
Depreciation of property, plant, and equipment | 7,305,000 | 6,721,000 | 5,529,000
Amortization of intangible assets | 3,797,000 | 4,137,000 | 4,227,000
Amortization of discounts or premiums on investments | 2,519,000 | 5,735,000 | 6,383,000
Realized (gain) loss on sale of investments | 403,000 | (1,625,000) | 181,000
Change in deferred income taxes | 2,234,000 | 429,000 | (425,000)
Tax effect of stock option exercises | (7,658,000) | (3,594,000) | (4,045,000)
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (11,311,000) | 5,035,000 | (2,031,000)
Inventories | 666,000 | 1,872,000 | (5,743,000)
Accrued expenses | 5,593,000 | (1,974,000) | 2,747,000
Accrued income taxes | 7,968,000 | 3,363,000 | (2,865,000)
Deferred revenue and customer deposits | 3,228,000 | (761,000) | 3,316,000
Other | (3,482,000) | 5,175,000 | 1,064,000
Net cash provided by operating activities | 95,455,000 | 101,131,000 | 86,275,000
Cash flows from investing activities: |  |  |
Purchases of investments | (370,781,000) | (460,486,000) | (323,946,000)
Maturities and sales of investments | 296,091,000 | 431,510,000 | 241,557,000
Purchases of property, plant, and equipment | (9,630,000) | (9,878,000) | (7,820,000)
Cash paid for purchased technology | (3,750,000) |  |
Net cash used in investing activities | (88,070,000) | (38,854,000) | (90,209,000)
Cash flows from financing activities: |  |  |
Issuance of common stock under stock option plans | 27,792,000 | 17,468,000 | 30,863,000
Payment of dividends | 0 | (66,213,000) | (15,114,000)
Repurchase of common stock | (47,908,000) |  | (10,000,000)
Tax effect of stock option exercises | 7,658,000 | 3,594,000 | 4,045,000
Net cash provided by (used in) financing activities | (12,458,000) | (45,151,000) | 9,794,000
Effect of foreign exchange rate changes on cash and cash equivalents | 557,000 | (10,069,000) | (960,000)
Net change in cash and cash equivalents | (4,516,000) | 7,057,000 | 4,900,000
Cash and cash equivalents at beginning of year | 45,160,000 | 38,103,000 | 33,203,000
Cash and cash equivalents at end of year | $ 40,644,000 | $ 45,160,000 | $ 38,103,000

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- Definition The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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