Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 63,612	$ 45,591
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	122,677	105,347
Deferred income taxes	(1,367)	13,747
Stock-based and performance share unit compensation expense, net	4,888	4,385
Retirement and deferred compensation plans expense, net	486	5,461
Earnings/losses from equity-method investments, net of cash received	(3,989)	2,508
Amortization of debt acquisition costs and note discount	12,700	11,731
Gain on sale of businesses	(8,558)
Other, net	(3,006)	(1,785)
Changes in operating assets and liabilities, net of acquisitions and dispositions:
Receivables	16,773	(36,885)
Inventory and other current assets	10,665	73,451
Accounts payable	952	8,764
Accrued expenses	10,609	3,505
Income taxes	3,046	11,570
Other, net	(1,498)	9,669
Net cash provided by operating activities	227,990	257,059
Cash flows from investing activities:
Payments for capital expenditures	(216,682)	(147,815)
Purchase of short-term investment, net	(164,130)
Acquisitions of businesses, net of cash acquired	0	(207,772)
Cash proceeds from sale of businesses	22,349
Other, net	(6,134)	(5,177)
Net cash used in investing activities	(364,597)	(360,764)
Cash flows from financing activities:
Net payment on revolving credit facility	(175,000)	(37,400)
Proceeds from long-term debt	500,000
Principal payments on long-term debt	(405)	(405)
Payment of debt acquisition costs	(9,363)
Proceeds from exercise of stock options	10,129	342
Excess tax benefit from stock-based compensation	10,262	163
Proceeds from issuance of stock through employee benefit plans	1,223	1,054
Other	(7,629)	(1,314)
Net cash provided by (used in) financing activities	329,217	(37,560)
Effect of exchange rate changes on cash	777	(1,191)
Net increase (decrease) in cash and cash equivalents	193,387	(142,456)
Cash and cash equivalents at beginning of period	50,727	206,505
Cash and cash equivalents at end of period	$ 244,114	$ 64,049