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Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of year	$ 84,166	$ 192,154
Cash flows from operating activities:
Net income	171,931	186,437
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation and amortization	53,463	39,196
Noncash pension and postretirement expense	4,129	5,976
Deferred income tax expense	10,257	8,639
Working capital changes	(69,190)	(34,945)
Cash pension and postretirement contributions	(61,860)	(19,566)
Other, net	(7,585)	(7,986)
Net Cash Provided by (Used in) Operating Activities	101,145	177,751
Cash flows from investing activities:
Capital expenditures	(55,136)	(120,973)
Acquisition of business (net of $1,131 cash acquired)	0	(183,930)
Other, net	14,573	(2,000)
Net Cash Provided by (Used in) Investing Activities	(40,563)	(306,903)
Cash flows from financing activities:
Net borrowings (repayments) under revolving credit facility	215,619	(146,000)
Issuance of 3.78% senior notes	0	250,000
Dividends paid	(60,778)	(62,227)
Repurchases of common stock	(148,649)	0
Other, net	(242)	(3,048)
Net Cash Provided by (Used in) Financing Activities	5,950	38,725
Effect of foreign exchange on cash and cash equivalents	(2,763)	3,269
Increase (decrease) in cash and cash equivalents	63,769	(87,158)
Cash and cash equivalents at end of period	$ 147,935	$ 104,996

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