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Consolidated Statements Of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 404,169 | $ 347,588 | $ 260,716
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 80,271 | 64,568 | 51,475
Deferred income taxes | (4,576) | 22,881 | (12,908)
Stock-based compensation | 28,027 | 23,021 | 21,734
Unrealized losses (gains) on foreign currency transactions | (2,670) | 7,949 | 2,298
Other | (3,586) | 986 | 2,724
Provisions for inventory, warranty and bad debt | 38,862 | 44,978 | 46,469
Changes in assets and liabilities that (used) provided cash, net of acquisitions: |  |  |
Accounts receivable | (18,814) | (63,225) | (11,444)
Inventories | (135,440) | (71,080) | (53,626)
Prepaid expenses and other current assets | (7,062) | (911) | (4,069)
Accounts payable | (1,426) | 2,309 | (407)
Accrued expenses and other liabilities | (19,666) | 9,612 | 5,480
Income and other taxes payable | 35,212 | 16,719 | (10,746)
Net cash provided by operating activities | 393,301 | 405,395 | 297,696
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Purchases of property, plant and equipment | (160,343) | (126,535) | (127,042)
Proceeds from sales of property, plant and equipment | 1,026 | 15,882 | 658
Proceeds from short-term investments | 470,328 | 212,515 | 198,808
Purchases of short and long-term investments | (765,310) | (211,832) | (299,508)
Acquisitions of businesses, net of cash acquired | (109,115) | (60,483) | (47,792)
Other | 415 | (352) | 468
Net cash used in investing activities | (562,999) | (170,805) | (274,408)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from line-of-credit facilities | 255 | 6,761 | 7,992
Payments on line-of-credit facilities | (255) | (6,761) | (7,992)
Purchase of noncontrolling interests | 0 | (197) | (950)
Proceeds on long-term borrowings | 0 | 28,000 | 23,750
Proceeds from issuance of common stock under employee stock option and purchase plans less payments for taxes related to net share settlement of equity awards | 12,183 | 28,654 | 16,183
Principal payments on long-term borrowings | (3,604) | (19,842) | (2,594)
Cash contributed by noncontrolling interest | 839 | 0 | 0
Purchase of treasury stock, at cost | (176,065) | (39,987) | (8,946)
Net cash (used in) provided by financing activities | (166,647) | (3,372) | 27,443
EFFECT OF CHANGES IN EXCHANGE RATES ON CASH AND CASH EQUIVALENTS | (29,197) | 54,827 | (9,408)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS | (365,542) | 286,045 | 41,323
CASH AND CASH EQUIVALENTS — Beginning of period | 909,900 | 623,855 | 582,532
CASH AND CASH EQUIVALENTS — End of period | 544,358 | 909,900 | 623,855
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION: |  |  |
Cash paid for interest | 3,052 | 2,583 | 942
Cash paid for income taxes | 112,762 | 155,559 | 126,964
Non-cash transactions: |  |  |
Demonstration units transferred from inventory to other assets | 6,270 | 4,114 | 6,293
Property, plant and equipment transferred from inventory | 2,535 | 8,425 | 4,529
Changes in accounts payable related to property, plant and equipment | $ (2,852) | $ 1,594 | $ 973

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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + 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 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + 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 consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3000-108585 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + 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 (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + 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 (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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