Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 123,192	$ 78,808
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	187,552	162,152
Deferred income taxes	38,900	1,282
Excess tax benefit from stock-based compensation	(10,262)	(195)
Stock-based and performance share unit compensation expense	10,273	18,347
Retirement and deferred compensation plans expense	1,994	5,035
(Earnings)/losses from equity-method investments, net of cash received	(12,187)	416
Amortization of debt acquisition costs and note discount	19,333	17,857
Gain on sale of businesses	(8,558)
Other reconciling items, net	(4,659)	(3,743)
Changes in operating assets and liabilities, net of acquisitions and dispositions:
Accounts receivable	(28,599)	(131,504)
Inventory and other current assets	11,415	118,619
Accounts payable	3,064	(1,547)
Accrued expenses	27,207	21,710
Income taxes	777	36,482
Other, net	2,683	13,031
Net cash provided by operating activities	362,125	336,750
Cash flows from investing activities:
Payments for capital expenditures	(329,229)	(238,812)
Purchases of short-term investments, net	(223,491)
Acquisitions of businesses, net of cash acquired	(748)	(262,048)
Cash proceeds from sale of businesses	22,349
Other, net	(720)	(6,269)
Net cash used in investing activities	(531,839)	(507,129)
Cash flows from financing activities:
Net (payments) borrowings on revolving credit facility	(175,000)	16,500
Proceeds from long-term debt	500,000
Principal payments on long-term debt	(405)	(405)
Payment of debt acquisition costs	(9,558)	(5,164)
Proceeds from exercise of stock options	10,211	396
Excess tax benefit from stock-based compensation	10,262	195
Proceeds from issuance of stock through employee benefit plans	1,702	1,505
Other	(8,453)	(2,100)
Net cash provided by financing activities	328,759	10,927
Effect of exchange rate changes on cash	409	328
Net increase (decrease) in cash and cash equivalents	159,454	(159,124)
Cash and cash equivalents at beginning of period	50,727	206,505
Cash and cash equivalents at end of period	$ 210,181	$ 47,381