CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating activities:
Net income	$ 152,019	$ 151,719
Income from discontinued operations, net of tax	154	0
Income from continuing operations	151,865	151,719
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	256,861	245,066
Earnings, net of distributions, from equity method investments	(314)	(2,502)
Deferred income taxes	79,985	71,322
Changes in current assets and liabilities, net of acquisitions:
Receivables	(57,829)	(57,074)
Inventories	(21,004)	(12,565)
Other current assets	2,976	(32,122)
Accounts payable	(8,037)	19,782
Other current liabilities	31,592	(147)
Other noncurrent changes	(23,908)	(11,959)
Net cash provided by continuing operations	412,187	371,520
Net cash used in discontinued operations	(572)	0
Net cash provided by operating activities	411,615	371,520
Investing activities:
Capital expenditures	(339,461)	(340,221)
Acquisitions, net of cash acquired	(157)	(106,548)
Net proceeds from sale or disposition of property	23,584	16,496
Investments	(9,768)	1,106
Net cash used in continuing operations	(325,802)	(429,167)
Net cash provided by discontinued operations	0	0
Net cash used in investing activities	(325,802)	(429,167)
Financing activities:
Issuance of short-term borrowings	0	4,700
Repayment of short-term borrowings	(20,000)	(10,300)
Issuance of long-term debt	300	17,799
Repayment of long-term debt	(83,805)	(7,545)
Proceeds from issuance of common stock	5,744	2,735
Dividends paid	(92,473)	(89,347)
Excess tax benefit on stock-based compensation	1,248	721
Net cash used in continuing operations	(188,986)	(81,237)
Net cash provided by discontinued operations	0	0
Net cash used in financing activities	(188,986)	(81,237)
Effect of exchange rate changes on cash and cash equivalents	(199)	55
Decrease in cash and cash equivalents	(103,372)	(138,829)
Cash and cash equivalents -- beginning of year	222,074	175,114
Cash and cash equivalents -- end of period	$ 118,702	$ 36,285