Financial Information Related To Guarantor Subsidiaries (Statement Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income (loss)	$ 365,935	$ 142,554	$ 81,817
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	510,526	257,313	220,835
Deferred income taxes	11,218	48,073	8,276
Excess tax benefit from stock-based compensation	(1,555)	(9,004)	(560)
Gain loss from Equity method investment	(17,880)
Reduction in value of assets		46,096	32,004
Stock based and performance share unit compensation expense	36,570	14,032	33,602
Retirement and deferred compensation plan expense	1,607	1,990	4,825
(Earnings) losses from consolidated subsidiaries
(Earnings) losses from equity-method investments, net of cash received	3,360	(13,152)	2,905
Amortization of debt acquisition costs and note discount	9,856	25,178	23,954
(Gain) loss sale of business	6,649	(8,558)	(1,083)
Writeoff of debt acquisition costs and note discount	3,460
Other reconciling items, net	1,205	(6,426)	(4,708)
Changes in operating assets and liabilities, net of acquisitions and dispositions:
Accounts receivable	(42,946)	(86,814)	(89,800)
Inventory and other current assets	62,720	2,182	85,687
Accounts payable	(30,977)	40,289	20,303
Accrued expenses	(26,107)	24,961	8,359
Decommissioning liabilities	(4,660)	(504)	(1,759)
Income taxes	152,093	(1,378)	10,510
Other, net	(6,031)	15,972	20,806
Net cash provided by (used in) operating activities	1,035,043	492,804	455,973
Cash flows from investing activities:
Payments for capital expenditures	(1,141,922)	(484,648)	(323,244)
Proceeds from Sale of Available-for-sale Securities, Equity	41,874
Acquisitions of businesses, net of cash acquired	(1,091,161)	(1,748)	(276,077)
Change in restricted cash held for acquisition of business	785,280	(785,280)
Cash proceeds from sale of businesses	183,094	22,349	5,250
Proceeds from Sale of Equity Method Investments	34,087
Purchase of short-term investments, net.		(223,491)
Proceeds from sale of short-term investments		223,630
Other	31,630	(721)	(9,402)
Intercompany receivables/payables
Net cash provided by (used in) investing activities	(1,157,118)	(1,249,909)	(603,473)
Cash flows from financing activities:
Repayments of Long-term Lines of Credit	(771,439)	(424,913)	(577,867)
Proceeds from Long-term Lines of Credit	696,439	324,913	575,867
Proceeds from long-term debt	400,000	1,300,000
Principal payments of long-term debt	(177,546)	(400,810)	(810)
Payment of debt acquisition costs	(25,274)	(24,428)	(5,182)
Proceeds from exercise of stock options	14,777	10,263	927
Excess tax benefit from stock-based compensation	1,555	9,004	560
Proceeds from issuance of stock through employee benefit plans	2,855	2,206	1,891
Other	(10,383)	(9,662)	(3,443)
Net cash provided by (used in) financing activities	130,984	786,573	(8,057)
Effect of exchange rate changes on cash	2,016	79	(221)
Net increase (decrease) in cash and cash equivalents	10,925	29,547	(155,778)
Cash and cash equivalents at beginning of period	80,274	50,727	206,505
Cash and cash equivalents at end of period	91,199	80,274	50,727
Parent [Member]
Cash flows from operating activities:
Net income (loss)	365,935	142,554	81,817
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion
Deferred income taxes	7,429	49,946	10,650
Excess tax benefit from stock-based compensation	(1,555)	(9,004)	(560)
Gain loss from Equity method investment
Reduction in value of assets
Stock based and performance share unit compensation expense
Retirement and deferred compensation plan expense
(Earnings) losses from consolidated subsidiaries	(566,021)	(218,198)	(119,801)
(Earnings) losses from equity-method investments, net of cash received
Amortization of debt acquisition costs and note discount
(Gain) loss sale of business
Writeoff of debt acquisition costs and note discount
Other reconciling items, net
Changes in operating assets and liabilities, net of acquisitions and dispositions:
Accounts receivable
Inventory and other current assets
Accounts payable
Accrued expenses	8	12	38
Decommissioning liabilities
Income taxes	154,879	(917)	13,536
Other, net	(23)	(16)	(1,417)
Net cash provided by (used in) operating activities	(39,348)	(35,623)	(15,737)
Cash flows from investing activities:
Payments for capital expenditures
Proceeds from Sale of Available-for-sale Securities, Equity
Acquisitions of businesses, net of cash acquired
Cash proceeds from sale of businesses
Proceeds from Sale of Equity Method Investments
Purchase of short-term investments, net.
Proceeds from sale of short-term investments
Other
Intercompany receivables/payables	20,550	14,485	12,359
Net cash provided by (used in) investing activities	20,550	14,485	12,359
Cash flows from financing activities:
Repayments of Long-term Lines of Credit
Proceeds from Long-term Lines of Credit
Proceeds from long-term debt
Principal payments of long-term debt
Payment of debt acquisition costs
Proceeds from exercise of stock options	14,777	10,263	927
Excess tax benefit from stock-based compensation	1,555	9,004	560
Proceeds from issuance of stock through employee benefit plans	2,855	2,206	1,891
Other	(389)	(335)
Net cash provided by (used in) financing activities	18,798	21,138	3,378
Effect of exchange rate changes on cash
Net increase (decrease) in cash and cash equivalents
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period
Issuer [Member]
Cash flows from operating activities:
Net income (loss)	566,020	218,198	119,801
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	685	523	515
Deferred income taxes
Excess tax benefit from stock-based compensation
Gain loss from Equity method investment	(17,880)
Reduction in value of assets
Stock based and performance share unit compensation expense	36,570	14,032	33,602
Retirement and deferred compensation plan expense	1,607	1,990	4,825
(Earnings) losses from consolidated subsidiaries	(811,768)	(330,553)	(255,257)
(Earnings) losses from equity-method investments, net of cash received	2,787	(12,001)	9,005
Amortization of debt acquisition costs and note discount	9,856	25,154	23,954
(Gain) loss sale of business
Writeoff of debt acquisition costs and note discount	2,714
Other reconciling items, net	2,860	(1,884)	(161)
Changes in operating assets and liabilities, net of acquisitions and dispositions:
Accounts receivable	(493)	(117)	275
Inventory and other current assets	174	(117)	163
Accounts payable	(1,115)	(2,348)	2,001
Accrued expenses	(17,540)	7,983	(595)
Decommissioning liabilities
Income taxes
Other, net	731	(1,024)	(3,143)
Net cash provided by (used in) operating activities	(224,792)	(80,164)	(65,015)
Cash flows from investing activities:
Payments for capital expenditures	(5,041)	(93)
Proceeds from Sale of Available-for-sale Securities, Equity	41,874
Acquisitions of businesses, net of cash acquired	(1,229,327)
Cash proceeds from sale of businesses	183,094
Proceeds from Sale of Equity Method Investments	34,087
Purchase of short-term investments, net.		(223,491)
Proceeds from sale of short-term investments		223,630
Other			2,387
Intercompany receivables/payables	273,952	125,015	(102,093)
Net cash provided by (used in) investing activities	83,919	(660,219)	(99,706)
Cash flows from financing activities:
Repayments of Long-term Lines of Credit	(771,439)	(424,913)	(577,867)
Proceeds from Long-term Lines of Credit	696,439	324,913	575,867
Proceeds from long-term debt	400,000	1,300,000
Principal payments of long-term debt	(165,000)	(400,000)
Payment of debt acquisition costs	(25,274)	(24,428)	(5,182)
Proceeds from exercise of stock options
Excess tax benefit from stock-based compensation
Proceeds from issuance of stock through employee benefit plans
Other	(3,424)	(6,132)
Net cash provided by (used in) financing activities	131,302	769,440	(7,182)
Effect of exchange rate changes on cash
Net increase (decrease) in cash and cash equivalents	(9,571)	29,057	(171,903)
Cash and cash equivalents at beginning of period	29,057		171,903
Cash and cash equivalents at end of period	19,486	29,057
Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net income (loss)	811,766	361,541	260,076
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	426,585	211,988	181,216
Deferred income taxes
Excess tax benefit from stock-based compensation
Gain loss from Equity method investment
Reduction in value of assets		46,096	32,004
Stock based and performance share unit compensation expense
Retirement and deferred compensation plan expense
(Earnings) losses from consolidated subsidiaries	(46,881)	(2,621)	(3,555)
(Earnings) losses from equity-method investments, net of cash received
Amortization of debt acquisition costs and note discount
(Gain) loss sale of business	6,649	(8,558)	(1,083)
Writeoff of debt acquisition costs and note discount
Other reconciling items, net	(3,369)	(4,542)	(4,547)
Changes in operating assets and liabilities, net of acquisitions and dispositions:
Accounts receivable	28,821	(51,133)	(76,669)
Inventory and other current assets	63,260	5,348	89,302
Accounts payable	(56,323)	26,499	18,928
Accrued expenses	(47,423)	11,801	1,735
Decommissioning liabilities	(4,660)		(1,759)
Income taxes
Other, net	4,919	18,646	21,280
Net cash provided by (used in) operating activities	1,183,344	614,561	516,928
Cash flows from investing activities:
Payments for capital expenditures	(982,231)	(383,785)	(218,726)
Proceeds from Sale of Available-for-sale Securities, Equity
Acquisitions of businesses, net of cash acquired	103,952	(1,200)	(56,560)
Cash proceeds from sale of businesses		22,349	5,250
Proceeds from Sale of Equity Method Investments
Purchase of short-term investments, net.
Proceeds from sale of short-term investments
Other	26,154	(721)	(11,537)
Intercompany receivables/payables	(322,966)	(250,425)	(234,733)
Net cash provided by (used in) investing activities	(1,175,091)	(613,782)	(516,306)
Cash flows from financing activities:
Repayments of Long-term Lines of Credit
Proceeds from Long-term Lines of Credit
Proceeds from long-term debt
Principal payments of long-term debt
Payment of debt acquisition costs
Proceeds from exercise of stock options
Excess tax benefit from stock-based compensation
Proceeds from issuance of stock through employee benefit plans
Other	(3,000)
Net cash provided by (used in) financing activities	(3,000)
Effect of exchange rate changes on cash
Net increase (decrease) in cash and cash equivalents	5,253	779	622
Cash and cash equivalents at beginning of period	6,272	5,493	4,871
Cash and cash equivalents at end of period	11,525	6,272	5,493
Non-Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net income (loss)	46,884	(28,367)	(1,264)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	83,256	44,802	39,104
Deferred income taxes	3,789	(1,873)	(2,374)
Excess tax benefit from stock-based compensation
Gain loss from Equity method investment
Reduction in value of assets
Stock based and performance share unit compensation expense
Retirement and deferred compensation plan expense
(Earnings) losses from consolidated subsidiaries
(Earnings) losses from equity-method investments, net of cash received	573	(1,151)	(6,100)
Amortization of debt acquisition costs and note discount		24
(Gain) loss sale of business
Writeoff of debt acquisition costs and note discount	746
Other reconciling items, net	1,714
Changes in operating assets and liabilities, net of acquisitions and dispositions:
Accounts receivable	(71,274)	(35,564)	(13,406)
Inventory and other current assets	(714)	(3,049)	(3,778)
Accounts payable	26,461	16,138	(626)
Accrued expenses	38,848	5,165	7,181
Decommissioning liabilities
Income taxes	(2,786)	(461)	(3,026)
Other, net	(11,658)	(1,634)	4,086
Net cash provided by (used in) operating activities	115,839	(5,970)	19,797
Cash flows from investing activities:
Payments for capital expenditures	(154,650)	(100,770)	(104,518)
Proceeds from Sale of Available-for-sale Securities, Equity
Acquisitions of businesses, net of cash acquired	34,214	(548)	(219,517)
Cash proceeds from sale of businesses
Proceeds from Sale of Equity Method Investments
Purchase of short-term investments, net.
Proceeds from sale of short-term investments
Other	5,476		(252)
Intercompany receivables/payables	28,464	110,925	324,467
Net cash provided by (used in) investing activities	(86,496)	9,607	180
Cash flows from financing activities:
Repayments of Long-term Lines of Credit
Proceeds from Long-term Lines of Credit
Proceeds from long-term debt
Principal payments of long-term debt	(12,546)	(810)	(810)
Payment of debt acquisition costs
Proceeds from exercise of stock options
Excess tax benefit from stock-based compensation
Proceeds from issuance of stock through employee benefit plans
Other	(3,570)	(3,195)	(3,443)
Net cash provided by (used in) financing activities	(16,116)	(4,005)	(4,253)
Effect of exchange rate changes on cash	2,016	79	(221)
Net increase (decrease) in cash and cash equivalents	15,243	(289)	15,503
Cash and cash equivalents at beginning of period	44,945	45,234	29,731
Cash and cash equivalents at end of period	60,188	44,945	45,234
Consolidation, Eliminations [Member]
Cash flows from operating activities:
Net income (loss)	(1,424,670)	(551,372)	(378,613)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion
Deferred income taxes
Excess tax benefit from stock-based compensation
Gain loss from Equity method investment
Reduction in value of assets
Stock based and performance share unit compensation expense
Retirement and deferred compensation plan expense
(Earnings) losses from consolidated subsidiaries	1,424,670	551,372	378,613
(Earnings) losses from equity-method investments, net of cash received
Amortization of debt acquisition costs and note discount
(Gain) loss sale of business
Writeoff of debt acquisition costs and note discount
Other reconciling items, net
Changes in operating assets and liabilities, net of acquisitions and dispositions:
Accounts receivable
Inventory and other current assets
Accounts payable
Accrued expenses
Decommissioning liabilities
Income taxes
Other, net
Net cash provided by (used in) operating activities
Cash flows from investing activities:
Payments for capital expenditures
Proceeds from Sale of Available-for-sale Securities, Equity
Acquisitions of businesses, net of cash acquired
Cash proceeds from sale of businesses
Proceeds from Sale of Equity Method Investments
Purchase of short-term investments, net.
Proceeds from sale of short-term investments
Other
Intercompany receivables/payables
Net cash provided by (used in) investing activities
Cash flows from financing activities:
Repayments of Long-term Lines of Credit
Proceeds from Long-term Lines of Credit
Proceeds from long-term debt
Principal payments of long-term debt
Payment of debt acquisition costs
Proceeds from exercise of stock options
Excess tax benefit from stock-based compensation
Proceeds from issuance of stock through employee benefit plans
Other
Net cash provided by (used in) financing activities
Effect of exchange rate changes on cash
Net increase (decrease) in cash and cash equivalents
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period