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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