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:
Net income	$ 289,660	$ 123,192
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	367,518	187,552
Deferred income taxes	(14,745)	38,900
Excess tax benefit from stock-based compensation	(1,537)	(10,262)
Gain loss from Equity method investment	(17,880)
Stock based and performance share unit compensation expense	27,845	10,273
Retirement and deferred compensation plan expense	1,455	1,994
Earnings Losses from Consolidated Subsidiaries
(Earnings) losses from equity-method investments, net of cash received	3,340	(12,187)
Amortization of debt acquisition costs and note discount	7,439	19,333
(Gain) loss sale of business	6,649	(8,558)
Writeoff of debt acquisition costs and note discount	3,460
Other reconciling items, net	1,582	(4,659)
Changes in operating assets and liabilities, net of acquisitions and dispositions:
Accounts receivable	(144,316)	(28,599)
Inventory and other current assets	85,119	11,415
Accounts payable	(757)	3,064
Accrued expenses	(29,835)	27,207
Decommissioning liabilities	(4,624)
Income taxes	141,916	777
Other, net	(25,701)	2,683
Net Cash Provided by (Used in) Operating Activities, Total	696,588	362,125
Cash flows from investing activities:
Payments for capital expenditures	(918,193)	(329,229)
Proceeds from Sale of Available-for-sale Securities, Equity	31,150
Purchase of short-term investments, net.		(223,491)
Change in restricted cash held for acquisition of business	785,280
Acquisitions of businesses, net of cash acquired	(1,072,532)	(748)
Cash proceeds from sale of businesses	183,094	22,349
Proceeds from Sale of Equity Method Investments	34,087
Other	28,438	(720)
Net Cash Provided by (Used in) Investing Activities, Total	(928,676)	(531,839)
Cash flows from financing activities:
Net payments on revolving line of credit	15,000	(175,000)
Proceeds from issuance of long-term debt	400,000	500,000
Principal payments of long-term debt	(172,546)	(405)
Payment of debt acquisition costs	(25,266)	(9,558)
Proceeds from exercise of stock options	13,915	10,211
Excess tax benefit from stock-based compensation	1,537	10,262
Proceeds from issuance of stock through employee benefit plans	2,193	1,702
Other	(5,843)	(8,453)
Net Cash Provided by (Used in) Financing Activities, Total	228,990	328,759
Effect of exchange rate changes on cash	1,910	409
Net increase in cash and cash equivalents	(1,188)	159,454
Cash and cash equivalents at beginning of period	80,274	50,727
Cash and cash equivalents at end of period	$ 79,086	$ 210,181