Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of year	$ 103,003	$ 238,703
Cash flows from operating activities:
Net income	184,689	181,200
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation and amortization	31,378	31,244
Noncash pension and postretirement expense	16,946	12,607
Deferred income tax (benefit) expense	(1,472)	5,623
Unrealized gain on derivative instruments, net	(583)	(614)
Working capital changes	(27,858)	(58,699)
Cash pension and postretirement contributions	(20,007)	(17,449)
Proceeds from legal settlements	0	5,150
Other, net	5,255	2,616
Cash provided from (used in) operating activities	188,348	161,678
Cash flows from investing activities:
Capital expenditures	(84,206)	(38,949)
Deposits for interest rate swap	(15,136)	(5,867)
Return of deposits for interest rate swap	15,660	6,600
Other, net	(4,947)	(5,004)
Cash provided from (used in) investing activities	(88,629)	(43,220)
Cash flows from financing activities:
Net borrowings under revolving credit facility	144,000	35,000
Dividends paid	(51,605)	(41,962)
Repurchases of common stock	(180,609)	(209,336)
Other, net	804	4,432
Cash provided from (used in) financing activities	(87,410)	(211,866)
Effect of foreign exchange on cash and cash equivalents	(4,985)	(3,759)
Increase (decrease) in cash and cash equivalents	7,324	(97,167)
Cash and cash equivalents at end of period	110,327	141,536
Supplemental disclosure of non-cash transactions:
Additions to property, plant, and equipment included in current liabilities	$ 10,357	$ 3,754