Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net income (loss)	$ 53,920	$ 15,503
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	103,841	59,363
Deferred income taxes	(10,979)	2,773
Excess tax benefit from stock-based compensation	(843)	(5,078)
Stock based and performance share unit compensation expense	10,591	3,686
Retirement and deferred compensation plan expense	621	123
(Earnings) losses from equity-method investments, net of cash received	2,921	(27)
Amortization of debt acquisition costs and note discount	2,210	6,255
(Gain) loss sale of business	6,649	(2,674)
Other reconciling items, net	3,481	(1,482)
Changes in operating assets and liabilities, net of acquisitions and dispositions:
Accounts receivable	(64,163)	78,834
Inventory and other current assets	(15,868)	(3,015)
Accounts payable	28,436	(2,305)
Accrued expenses	(56,346)	(13,145)
Decommissioning liabilities	(2,661)
Income taxes	38,809	(2,558)
Other, net	(6,562)	1,692
Net cash provided by operating activities from continuing operations	94,057	137,945
Cash flows from investing activities:
Payments for capital expenditures	(273,245)	(108,579)
Change in restricted cash held for acquisition of business	785,280
Acquisitions of businesses, net of cash acquired	(1,038,241)
Cash proceeds from sale of businesses	185,912	5,762
Other	3,305	(1,974)
Net cash used in investing activities from continuing operations	(336,989)	(104,791)
Cash flows from financing activities:
Net payments on revolving line of credit	(75,000)	(19,000)
Proceeds from issuance of long-term debt	400,000
Principal payments of long-term debt	(12,546)
Payment of debt acquisition costs	(25,011)
Proceeds from exercise of stock options	12,256	6,147
Excess tax benefit from stock-based compensation	843	5,078
Proceeds from issuance of stock through employee benefit plans	819	634
Other	(3,610)	(6,551)
Net cash provided by (used in) financing activities from continuing operations	297,751	(13,692)
Effect of exchange rate changes on cash	665	893
Net increase in cash and cash equivalents	55,484	20,355
Cash and cash equivalents at beginning of period	80,274	50,727
Cash and cash equivalents at end of period	$ 135,758	$ 71,082