Supplemental Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Statements Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash provided by (used in) operating activities	$ 332,804	$ 642,242	$ 697,147
Investing Activities
Acquisition of ICG, net of cash acquired		(2,894,339)
Change in restricted cash	6,869	5,167
Capital expenditures	(395,225)	(540,936)	(314,657)
Proceeds from dispositions of property, plant and equipment	22,825	25,887	330
Investments in and advances to affiliates	(17,758)	(61,909)	(46,185)
Purchases of short term investments	(236,862)
Proceeds from Sale of Short-term Investments	1,754
Purchase of noncontrolling interest	(17,500)
Additions to prepaid royalties	(13,269)	(29,957)	(27,355)
Consideration paid related to prior business acquisition		(829)	(1,262)
Cash used in investing activities	(649,166)	(3,496,916)	(389,129)
Financing Activities
Contributions from parent
Proceeds from the issuance of senior notes	359,753	2,000,000	500,000
Proceeds from the sale of common stock, net		1,267,933
Proceeds from term note	1,633,500
Payments to retire debt	(452,934)	(605,178)	(505,627)
Net increase (decrease) in borrowings under lines of credit and commercial paper program	(481,300)	424,396	(196,549)
Payments on term note	(7,625)
Net payments on other debt	(682)	5,334	82
Debt financing costs	(50,568)	(114,823)	(12,751)
Dividends paid	(42,440)	(80,748)	(63,373)
Issuance of common stock under incentive plans	5,131	2,316	1,764
Proceeds from Noncontrolling Interests			891
Transactions with affiliates, net
Cash provided by (used in) financing activities	962,835	2,899,230	(275,563)
Increase (decrease) in cash and cash equivalents	646,473	44,556	32,455
Cash and cash equivalents, beginning of period	138,149	93,593	61,138
Cash and cash equivalents, end of period	784,622	138,149	93,593
Parent/Issuer [Member]
Cash provided by (used in) operating activities	(571,576)	(187,039)	(230,966)
Investing Activities
Acquisition of ICG, net of cash acquired		(2,894,339)
Change in restricted cash	6,869	5,167
Capital expenditures	(4,424)	(12,809)	(4,814)
Proceeds from dispositions of property, plant and equipment
Investments in and advances to affiliates	(6,287)	(633,534)	(13,821)
Purchases of short term investments	(236,862)
Proceeds from Sale of Short-term Investments	1,754
Purchase of noncontrolling interest	(17,500)
Additions to prepaid royalties
Consideration paid related to prior business acquisition		(829)	(1,262)
Cash used in investing activities	(256,450)	(3,536,344)	(19,897)
Financing Activities
Contributions from parent
Proceeds from the issuance of senior notes	359,753	2,000,000	500,000
Proceeds from the sale of common stock, net		1,267,933
Proceeds from term note	1,633,500
Payments to retire debt
Net increase (decrease) in borrowings under lines of credit and commercial paper program	(375,000)	375,000	(120,000)
Payments on term note	(7,625)
Net payments on other debt	(682)	5,334	82
Debt financing costs	(50,022)	(114,799)	(12,022)
Dividends paid	(42,440)	(80,748)	(63,373)
Issuance of common stock under incentive plans	5,131	2,316	1,764
Proceeds from Noncontrolling Interests			891
Transactions with affiliates, net	(84,651)	316,009	(97,021)
Cash provided by (used in) financing activities	1,437,964	3,771,045	210,321
Increase (decrease) in cash and cash equivalents	609,938	47,662	(40,542)
Cash and cash equivalents, beginning of period	61,375	13,713	54,255
Cash and cash equivalents, end of period	671,313	61,375	13,713
Guarantor Subsidiaries [Member]
Cash provided by (used in) operating activities	781,551	998,082	943,361
Investing Activities
Acquisition of ICG, net of cash acquired
Change in restricted cash
Capital expenditures	(390,801)	(528,021)	(309,843)
Proceeds from dispositions of property, plant and equipment	1,328	25,887	330
Investments in and advances to affiliates	(13,134)	(33,553)	(32,364)
Purchases of short term investments
Proceeds from Sale of Short-term Investments
Purchase of noncontrolling interest
Additions to prepaid royalties	(13,269)	(29,957)	(27,355)
Consideration paid related to prior business acquisition
Cash used in investing activities	(415,876)	(565,644)	(369,232)
Financing Activities
Contributions from parent	1,663	605,178
Proceeds from the issuance of senior notes
Proceeds from the sale of common stock, net
Proceeds from term note
Payments to retire debt	(452,934)	(605,178)	(505,627)
Net increase (decrease) in borrowings under lines of credit and commercial paper program		(56,904)	7,451
Payments on term note
Net payments on other debt
Debt financing costs		(16)	(390)
Dividends paid
Issuance of common stock under incentive plans
Proceeds from Noncontrolling Interests
Transactions with affiliates, net	110,639	(379,973)	(2,566)
Cash provided by (used in) financing activities	(340,632)	(436,893)	(501,132)
Increase (decrease) in cash and cash equivalents	25,043	(4,455)	72,997
Cash and cash equivalents, beginning of period	75,425	79,880	6,883
Cash and cash equivalents, end of period	100,468	75,425	79,880
Non-Guarantor Subsidiaries [Member]
Cash provided by (used in) operating activities	122,829	(168,801)	(15,248)
Investing Activities
Acquisition of ICG, net of cash acquired
Change in restricted cash
Capital expenditures		(106)
Proceeds from dispositions of property, plant and equipment	21,497
Investments in and advances to affiliates
Purchases of short term investments
Proceeds from Sale of Short-term Investments
Purchase of noncontrolling interest
Additions to prepaid royalties
Consideration paid related to prior business acquisition
Cash used in investing activities	21,497	(106)
Financing Activities
Contributions from parent
Proceeds from the issuance of senior notes
Proceeds from the sale of common stock, net
Proceeds from term note
Payments to retire debt
Net increase (decrease) in borrowings under lines of credit and commercial paper program	(106,300)	106,300	(84,000)
Payments on term note
Net payments on other debt
Debt financing costs	(546)	(8)	(339)
Dividends paid
Issuance of common stock under incentive plans
Proceeds from Noncontrolling Interests
Transactions with affiliates, net	(25,988)	63,964	99,587
Cash provided by (used in) financing activities	(132,834)	170,256	15,248
Increase (decrease) in cash and cash equivalents	11,492	1,349
Cash and cash equivalents, beginning of period	1,349
Cash and cash equivalents, end of period	12,841	1,349
Eliminations [Member]
Cash provided by (used in) operating activities
Investing Activities
Acquisition of ICG, net of cash acquired
Change in restricted cash
Capital expenditures
Proceeds from dispositions of property, plant and equipment
Investments in and advances to affiliates	1,663	605,178
Purchases of short term investments
Proceeds from Sale of Short-term Investments
Purchase of noncontrolling interest
Additions to prepaid royalties
Consideration paid related to prior business acquisition
Cash used in investing activities	1,663	605,178
Financing Activities
Contributions from parent	(1,663)	(605,178)
Proceeds from the issuance of senior notes
Proceeds from the sale of common stock, net
Proceeds from term note
Payments to retire debt
Net increase (decrease) in borrowings under lines of credit and commercial paper program
Payments on term note
Net payments on other debt
Debt financing costs
Dividends paid
Issuance of common stock under incentive plans
Proceeds from Noncontrolling Interests
Transactions with affiliates, net
Cash provided by (used in) financing activities	(1,663)	(605,178)
Increase (decrease) in cash and cash equivalents
Cash and cash equivalents, beginning of period
Cash and cash equivalents, end of period