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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Cash Flows [Abstract]      
Net income $ 92,617 $ 89,734 $ 67,888
Adjustments to reconcile net income to net cash provided by operating activities:      
Gain on sale of assets (160) (780) (389)
Depreciation and amortization 33,724 27,927 26,821
Write-off of software development project 676 2,212 3,140
Loss in equity method investment, before tax 86 0 0
Gain (adjustment) on bargain purchase of a business (6,336) 0 0
Loss on disposal of a business 211 0 0
Gain on contingent consideration adjustment 0 0 (245)
Deferred income taxes 6,299 (869) 2,537
Noncash compensation related to stock plans 13,908 13,946 11,958
Excess tax benefit of options exercised and restricted stock units vested 0 (273) (78)
Recovery (provision) of doubtful accounts 66 (83) 440
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions:      
Trade accounts receivable (17,822) (7,548) (16,818)
Inventories (6,580) (36,617) 17,208
Other current assets (2,016) (2,180) 6,274
Other noncurrent assets 513 336 (1,301)
Trade accounts payable 1,157 5,785 (1,035)
Accrued liabilities 10,130 4,290 (1,432)
Accrued profit sharing trust contributions 498 757 417
Accrued cash profit sharing and commissions (1,246) 2,064 2,530
Long-term liabilities (718) 242 (2,930)
Accrued workers’ compensation (343) (1,024) 492
Income taxes payable (5,599) 1,046 2,446
Net cash provided by operating activities 119,065 98,965 117,923
Cash flows from investing activities      
Capital expenditures (58,041) (42,002) (34,186)
Assets acquisitions, net of cash acquired (27,921) (5,361) (4,179)
Equity investments 0 (2,500) 0
Loan repayment by customer 0 0 244
Proceeds from sale of property and equipment 681 1,320 293
Proceeds from sale of a business 9,466 0 0
Net cash used in investing activities (75,815) (48,543) (37,828)
Cash flows from financing activities      
Repayment of long-term borrowings and capital leases (354) 0 (17)
Repayment of debt and line of credit borrowings (400) 0 0
Deferred and contingent consideration paid for asset acquisitions (205) (27) (1,177)
Debt issuance costs 0 (1,125) 0
Repurchase of common stock (70,000) (53,502) (47,144)
Issuance of Company’s common stock 6,610 7,976 9,720
Excess tax benefit of options exercised and restricted stock units vested 0 273 78
Dividends paid (36,981) (32,711) (29,352)
Cash paid on behalf of employees for shares withheld (5,341) (4,018) (3,716)
Net cash used in financing activities (106,671) (83,134) (71,608)
Effect of exchange rate changes on cash 5,398 424 (9,969)
Net decrease in cash and cash equivalents (58,023) (32,288) (1,482)
Cash and cash equivalents at beginning of year 226,537 258,825 260,307
Cash and cash equivalents at end of year 168,514 226,537 258,825
Cash paid during the year for      
Interest 121 284 249
Income taxes 50,832 49,425 34,008
Noncash activity during the year for      
Noncash capital expenditures 1,533 2,318 1,214
Capital lease obligations 3,750 0 0
Contingent consideration for acquisition 1,314 0 0
Issuance of Company's common stock for compensation 411 315 552
Dividends declared but not paid $ 9,954 $ 8,535 $ 7,716