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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement of Cash Flows [Abstract] |  |  |  |  |  |
Net income |  |  | $ 133,982 | $ 126,633 | $ 92,617 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |
Gain (loss) on sale of assets and other |  |  | (6,023) | (10,516) | 602 |
Depreciation and amortization |  |  | 38,402 | 39,393 | 33,724 |
Noncash lease expense |  |  | 7,136 | 0 | 0 |
Gain on bargain purchase of a business |  |  | 0 | 0 | (6,336) |
Loss on disposal of a business |  |  | 0 | 0 | 211 |
Impairment of goodwill | $ 0 | $ 6,686 | 0 | 6,686 | 0 |
Deferred income taxes |  |  | 2,557 | 4,950 | 6,299 |
Noncash compensation related to stock plans |  |  | 10,434 | 11,176 | 13,908 |
Provision of doubtful accounts |  |  | 977 | 569 | 66 |
Foreign exchange gain |  |  | 0 | 1,841 | 0 |
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions: |  |  |  |  |  |
Trade accounts receivable |  |  | 6,096 | (12,573) | (17,822) |
Inventories |  |  | 23,655 | (26,425) | (6,580) |
Other current assets |  |  | (3,808) | 5,297 | (2,016) |
Trade accounts payable |  |  | (845) | 4,670 | 1,157 |
Accrued liabilities and other current liabilities |  |  | (145) | 13,804 | 3,440 |
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net |  |  | (6,756) | (1,743) | (205) |
Net cash provided by operating activities |  |  | 205,662 | 160,080 | 119,065 |
Cash flows from investing activities |  |  |  |  |  |
Capital expenditures |  |  | (32,699) | (29,310) | (58,041) |
Acquisitions, net of cash acquired |  |  | (2,650) | (2,007) | (27,921) |
Payments to Acquire Intangible Assets |  |  | (4,827) |  |  |
Purchases of intangible assets |  |  |  |  |  | $ (2,500)
Proceeds from sale of property and equipment |  |  | 12,155 | 21,068 | 681 |
Proceeds from sale of a business |  |  | 0 | 0 | 9,466 |
Net cash used in investing activities |  |  | (28,021) | (10,249) | (75,815) |
Proceeds from Bank Debt |  |  | 16,647 |  |  |
Cash flows from financing activities |  |  |  |  |  |
Repayments of line of credit and capital leases |  |  | (17,883) | (147) | (754) |
Deferred and contingent consideration paid for acquisitions |  |  | 0 | (364) | (205) |
Repurchase of common stock |  |  | (60,816) | (110,540) | (70,000) |
Issuance of Company’s common stock |  |  | 0 | 695 | 6,610 |
Dividends paid |  |  | (40,197) | (39,891) | (36,981) |
Cash paid on behalf of employees for shares withheld |  |  | (5,905) | (5,146) | (5,341) |
Net cash used in financing activities |  |  | (108,154) | (155,393) | (106,671) |
Effect of exchange rate changes on cash |  |  | 543 | (2,772) | 5,398 |
Net decrease in cash and cash equivalents |  |  | 70,030 | (8,334) | (58,023) |
Cash and cash equivalents at beginning of year |  |  | 160,180 | 168,514 | 226,537 |
Cash and cash equivalents at end of year | 230,210 | 160,180 | 230,210 | 160,180 | 168,514 | $ 226,537
Cash paid during the year for |  |  |  |  |  |
Interest |  |  | 143 | 160 | 121 |
Income taxes |  |  | 37,730 | 40,123 | 50,832 |
Noncash activity during the year for |  |  |  |  |  |
Noncash capital expenditures |  |  | 557 | 908 | 1,533 |
Capital lease obligations | 0 | 0 | 0 | 0 | 3,750 |
Contingent consideration for acquisition | 0 | 0 | 0 | 0 | 1,314 |
Issuance of Company’s common stock for compensation |  |  | 292 | 465 | 411 |
Dividends declared but not paid | $ 10,170 | $ 9,988 | $ 10,170 | $ 9,988 | $ 9,954 |

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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + 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=118930883&loc=SL7669619-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 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=118930883&loc=SL7669625-108580 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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