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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |
Net income | $ 219,267 | $ 176,712 | $ 143,694
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Loss on sale of discontinued business | 0 | 0 | 255
Stock-based compensation expense | 41,090 | 31,942 | 20,558
Depreciation of property, plant, and equipment | 18,473 | 13,683 | 11,678
Amortization of intangible assets | 3,076 | 3,308 | 3,391
Impairment of intangible assets | 0 | 469 | 0
Amortization of discounts or premiums on investments | 108 | 205 | 383
Realized (gain) loss on sale of investments | (501) | (829) | (1,506)
Revaluation of contingent consideration | (3) | (28) | (463)
Change in deferred income taxes | (413) | 1,787 | (1,908)
Accounts receivable | (1,867) | (55,185) | (13,251)
Unbilled revenue | (906) | (4,604) | (2,308)
Inventories | (16,946) | (37,088) | 10,409
Prepaid expenses and other current assets | (9,750) | (7,016) | (5,421)
Accounts payable | (7,247) | 12,322 | 2,087
Accrued expenses | 380 | 14,476 | 7,771
Accrued income taxes | (21,903) | 71,335 | 1,270
Deferred revenue and customer deposits | 1,434 | 1,619 | 3,622
Other | (838) | 1,215 | 1,820
Net cash provided by operating activities | 223,454 | 224,323 | 182,081
Cash flows from investing activities: |  |  |
Purchases of investments | (782,032) | (636,856) | (751,868)
Maturities and sales of investments | 812,565 | 584,464 | 657,250
Purchases of property, plant, and equipment | (37,095) | (28,754) | (12,816)
Cash paid for acquisition of business, net of cash acquired | (4,265) | (24,118) | (14,285)
Net cash paid from sale of discontinued business | 0 | (291) | (113)
Net cash used in investing activities | (10,827) | (105,555) | (121,832)
Cash flows from financing activities: |  |  |
Issuance of common stock under stock plans | 26,783 | 54,557 | 43,468
Repurchase of common stock | (203,822) | (123,715) | (47,149)
Payment of dividends | (31,865) | (29,037) | (25,213)
Payment of contingent consideration | (1,000) | (1,926) | (337)
Net cash used in financing activities | (209,904) | (100,121) | (29,231)
Effect of foreign exchange rate changes on cash and cash equivalents | (1,093) | 8,294 | (3,352)
Net change in cash and cash equivalents | 1,630 | 26,941 | 27,666
Cash and cash equivalents at beginning of year | 106,582 | 79,641 | 51,975
Cash and cash equivalents at end of year | $ 108,212 | $ 106,582 | $ 79,641

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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the purchase of all investments (debt, security, other) during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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