Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating activities:
Net income	$ 127,357	$ 118,663
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	70,405	68,535
Loss (gain) on disposition of property, plant and equipment	124	(96)
Stock compensation expense	8,850	8,472
Changes in assets and liabilities, net of the effects of acquisitions:
Accounts receivable	(12,136)	(26,773)
Inventories	(24,525)	(11,454)
Prepaid expenses and other current assets	(7,186)	(2,398)
Accounts payable	4,824	14,134
Accrued liabilities	9,765	28,889
Deferred income taxes	(13,758)	(18,063)
Long-term retirement benefits	544	(11,469)
Long-term tax liability	(7,465)	0
Other	1,162	(677)
Net cash provided by operating activities	157,961	167,763
Investing activities:
Proceeds from disposition of property, plant and equipment	491	401
Capital expenditures	(40,168)	(41,957)
Business acquisitions, net of cash acquired	(30,837)	(8,922)
Revenue sharing program payments	(5,800)	0
Other	(1,000)	(3,000)
Net cash used by investing activities	(77,314)	(53,478)
Financing activities:
Net change in other borrowings	(5,542)	(14,103)
Payments on long-term debt	(381,887)	(60,897)
Proceeds from the issuance of long-term debt	414,989	89,118
Proceeds from the issuance of common stock	721	1,731
Common stock repurchases	(138,275)	(23,300)
Dividends paid	(23,996)	(22,042)
Withholding taxes paid on stock issuances	(5,149)	(4,851)
Other	(3,598)	(17,773)
Net cash used by financing activities	(142,737)	(52,117)
Effect of exchange rate changes on cash flows	(3,813)	5,856
(Decrease) increase in cash and cash equivalents	(65,903)	68,024
Cash and cash equivalents at beginning of period	145,290	66,447
Cash and cash equivalents at end of period	$ 79,387	$ 134,471