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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Cash Flows [Abstract]      
Net income $ 187,000 $ 133,982 $ 126,633
Adjustments to reconcile net income to net cash provided by operating activities:      
Gain on sale of assets and other (318) (6,023) (12,357)
Depreciation and amortization 38,767 38,402 39,393
Noncash lease expense 6,984 7,136 0
Impairment of goodwill 0 0 6,686
Deferred income taxes 3,179 2,557 4,950
Noncash compensation related to stock plans 13,507 10,434 11,176
Provision for (benefit from ) doubtful accounts (98) 977 569
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions:      
Trade accounts receivable (22,107) 6,096 (12,573)
Inventories (27,219) 23,655 (26,425)
Other current assets (845) (3,808) 5,297
Trade accounts payable 11,360 (845) 4,670
Accrued liabilities and other current liabilities 7,754 (145) 13,804
Other noncurrent assets and liabilities (10,392) (6,756) (1,743)
Net cash provided by operating activities 207,572 205,662 160,080
Cash flows from investing activities      
Capital expenditures (37,909) (37,526) (29,310)
Acquisitions, net of cash acquired (2,797) (2,650) (2,007)
Proceeds from sale of property and equipment 853 12,155 21,068
Net cash used in investing activities (39,853) (28,021) (10,249)
Cash flows from financing activities      
Proceeds from lines of credit 169,164 16,647 0
Repayments of line of credit and capital leases (170,680) (17,883) (147)
Debt issuance costs (712) 0 0
Deferred and contingent consideration paid for acquisitions 0 0 (364)
Repurchase of common stock (76,189) (60,816) (110,540)
Issuance of Company’s common stock 0 0 695
Dividends paid (40,400) (40,197) (39,891)
Cash paid on behalf of employees for shares withheld (7,960) (5,905) (5,146)
Net cash used in financing activities (126,777) (108,154) (155,393)
Effect of exchange rate changes on cash 3,487 543 (2,772)
Net increase (decrease) in cash and cash equivalents 44,429 70,030 (8,334)
Cash and cash equivalents at beginning of year 230,210 160,180 168,514
Cash and cash equivalents at end of year 274,639 230,210 160,180
Cash paid during the year for      
Interest 1,598 143 160
Income taxes 63,035 37,730 40,123
Noncash activity during the year for      
Noncash capital expenditures 3,719 557 908
Contingent consideration for acquisition 547 0 0
Issuance of Company’s common stock for compensation 341 292 465
Dividends declared but not paid $ 9,999 $ 10,170 $ 9,988