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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Statement of Cash Flows [Abstract]    
Net income $ 79,532 $ 72,341
Adjustments to reconcile net income to net cash provided by operating activities:    
Gain on sale of assets (147) (763)
Depreciation and amortization 26,881 21,485
Write-off of software development project 0 153
Loss in equity method investment, before tax 53 0
Gain (adjustment) on bargain purchase of a business (6,336) 0
Gain on disposal of a business (443) 0
Deferred income taxes 2,552 1,481
Noncash compensation related to stock plans 11,816 9,707
Excess tax benefit of options exercised and restricted stock units vested 0 (162)
Recovery (provision) of doubtful accounts 79 (131)
Changes in operating assets and liabilities, net of acquisitions:    
Trade accounts receivable (40,607) (35,463)
Inventories 1,813 (22,992)
Trade accounts payable 698 2,806
Income taxes payable 1,686 6,745
Accrued profit sharing trust contributions (902) (637)
Accrued cash profit sharing and commissions 2,468 8,636
Other current assets 132 (2,751)
Accrued liabilities 5,291 6,611
Long-term liabilities (234) (1,222)
Accrued workers’ compensation (21) (432)
Other noncurrent assets 280 1,471
Net cash provided by operating activities 84,591 66,883
Cash flows from investing activities    
Capital expenditures (45,106) (29,934)
Asset acquisitions, net of cash acquired (27,921) (5,361)
Proceeds from sale of property and equipment 617 1,278
Proceeds from sale of a business 9,613 0
Net cash used in investing activities (62,797) (34,017)
Cash flows from financing activities    
Deferred and contingent consideration paid for asset acquisitions (205) (27)
Repurchase of common stock (20,000) (53,502)
Repayment of long-term borrowings and capital leases (360) 0
Repayment of debt and line of credit borrowings (133) 0
Debt issuance costs 0 (1,125)
Issuance of common stock 3,566 6,695
Excess tax benefit of options exercised and restricted stock units vested 0 162
Dividends paid (27,044) (24,152)
Cash paid on behalf of employees for shares withheld (5,166) (3,996)
Net cash used in financing activities (49,342) (75,945)
Effect of exchange rate changes on cash and cash equivalents 5,182 2,974
Net decrease in cash and cash equivalents (22,366) (40,105)
Cash and cash equivalents at beginning of period 226,537 258,825
Cash and cash equivalents at end of period 204,171 218,720
Noncash activity during the period    
Noncash capital expenditures 892 726
Capital lease obligations 4,362 0
Dividends declared but not paid 19,891 8,559
Contingent consideration for acquisition 1,314 0
Issuance of Company’s common stock for compensation $ 412 $ 315