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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Cash Flows [Abstract]    
Net income $ 22,662 $ 25,429
Adjustments to reconcile net income to net cash provided by operating activities:    
Loss (gain) on sale of assets and other 286 (1,160)
Depreciation and amortization 9,758 9,688
Operating Lease, Expense 1,675  
Deferred income taxes 1,371 1,448
Noncash compensation related to stock plans 4,105 3,116
Provision of doubtful accounts (3) 222
Changes in operating assets and liabilities, net of acquisitions:    
Trade accounts receivable (26,968) (30,764)
Inventories 3,080 (3,071)
Trade accounts payable 1,915 11,451
Accrued liabilities 3,916 721
Accrued profit sharing trust contributions (4,907) (4,326)
Accrued cash profit sharing and commissions (772) (346)
Other current assets 323 1,923
Accrued liabilities (4,966) (983)
Long-term liabilities 286 3,763
Accrued workers’ compensation 11 12
Other noncurrent assets (2,124) (5)
Net cash provided by operating activities 9,648 17,118
Cash flows from investing activities    
Capital expenditures (7,352) (10,935)
Asset acquisitions, net of cash acquired (3,492) 0
Proceeds from sale of property and equipment 38 1,239
Net cash used in investing activities (10,806) (9,696)
Cash flows from financing activities    
Repurchase of common stock (30,000) (24,999)
Proceeds from line of credit 6,758 0
Repayments of line of credit and capital leases (6,459) (174)
Issuance of common stock for exercise of options 0 695
Dividends paid (9,901) (9,818)
Cash paid on behalf of employees for shares withheld (5,864) (5,027)
Net cash used in financing activities (45,466) (39,323)
Effect of exchange rate changes on cash and cash equivalents (149) 800
Net decrease in cash and cash equivalents (46,773) (31,101)
Cash and cash equivalents at beginning of period 160,180 168,514
Cash and cash equivalents at end of period 113,407 137,413
Noncash activity during the period    
Noncash capital expenditures 284 1,567
Dividends declared but not paid 9,761 10,190
Contingent consideration for acquisition 309 0
Issuance of Company’s common stock for compensation $ 292 $ 465