Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash and cash equivalents at beginning of year	$ 477,696	$ 469,416
Cash flows from operating activities:
Net income	89,516	118,633
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation and amortization	25,244	24,235
Stock-based compensation	2,513	6,926
Excess tax benefits realized from stock-based compensation arrangements	(1,901)	(4,544)
Equity in net income of unconsolidated investments (net of tax)	(10,261)	(8,586)
Dividends received from unconsolidated investments and nonmarketable securities	559	4,183
Pension and postretirement expense	1,582	243
Pension and postretirement contributions	(1,741)	(2,527)
Unrealized gain on investments in marketable securities	(1,037)	(1,262)
Deferred income taxes	6,506	10,800
Working capital changes	(12,641)	(32,728)
Other, net	311	8,171
Net cash provided by operating activities	98,650	123,544
Cash flows from investing activities:
Capital expenditures	(55,335)	(54,784)
Cash payments related to acquisitions and other		(134)
Sales of (investments in) marketable securities, net	821	(1,113)
Net cash used in investing activities	(54,514)	(56,031)
Cash flows from financing activities:
Repayments of long-term debt	(3,604)	(7,149)
Dividends paid to shareholders	(17,808)	(15,578)
Repurchases of common stock	(60,798)
Proceeds from exercise of stock options	1,720	2,569
Excess tax benefits realized from stock-based compensation arrangements	1,901	4,544
Withholding taxes paid on stock-based compensation award distributions	(5,443)	(6,516)
Net cash used in financing activities	(84,032)	(22,130)
Net effect of foreign exchange on cash and cash equivalents	(2,896)	4,560
(Decrease) increase in cash and cash equivalents	(42,792)	49,943
Cash and cash equivalents at end of period	$ 434,904	$ 519,359