CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash Flows from Operating Activities:
Consolidated net earnings	$ 63,803	$ 68,490
Adjustments to reconcile consolidated net earnings to net cash provided by operating activities:
Depreciation, depletion and amortization	132,985	129,673
Stock-based compensation expense	5,947	9,317
Gains on divestitures and sales of assets	(858)	(3,890)
Deferred income taxes	11,577	6,358
Other items, net	2,314	1,370
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable, net	(93,198)	(77,971)
Inventories, net	(12,486)	(4,431)
Accounts payable	7,077	25,975
Other assets and liabilities, net	4,883	24,979
Net Cash Provided by Operating Activities	122,044	179,870
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(105,941)	(93,518)
Acquisitions, net	(132)	(49,930)
Proceeds from divestitures and sales of assets	7,871	6,178
Net Cash Used for Investing Activities	(98,202)	(137,270)
Cash Flows from Financing Activities:
Borrowings of long-term debt	181,000	460,000
Repayments of long-term debt	(142,651)	(445,471)
Debt issuance costs	(300)	(3,328)
Change in bank overdraft	102	(2,123)
Dividends paid	(55,302)	(55,232)
Distributions to owners of noncontrolling interests	(800)	(1,000)
Purchase of remaining interest in existing subsidiaries		(10,394)
Issuances of common stock	3,508	1,465
Net Cash Used for Financing Activities	(14,443)	(56,083)
Net Increase (Decrease) in Cash and Cash Equivalents	9,399	(13,483)
Cash and Cash Equivalents, beginning of period	26,022	70,323
Cash and Cash Equivalents, end of period	35,421	56,840
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	29,255	36,649
Cash refunds for income taxes	$ 3,170	$ 7,831