Supplemental Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Statements Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Cash provided by (used in) operating activities	$ (40,275)	$ 43,291
Investing Activities
Capital expenditures	(14,454)	(54,522)
Additions to prepaid royalties	(591)	(9,142)
Proceeds from disposals and divestitures	28,195	714
Purchases of short term investments	(119,176)	(26,787)
Proceeds from sales of short term investments	117,681	11,534
Investments in and advances to affiliates	(3,242)	(4,298)
Change in restricted cash	0	1,163
Cash provided by (used in) investing activities	8,413	(81,338)
Financing Activities
Contributions from parent
Payments on term loan	(4,875)	(4,125)
Net payments on other debt	(4,521)	(5,964)
Debt financing costs	(1,957)
Dividends paid	(2,123)	(6,367)
Transactions with affiliates, net
Cash used in financing activities	(13,476)	(16,456)
Increase (decrease) in cash and cash equivalents	(45,338)	(54,503)
Cash and cash equivalents, beginning of period	911,099	784,622
Cash and cash equivalents, end of period	865,761	730,119
Parent/Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Cash provided by (used in) operating activities	(150,338)	(61,840)
Investing Activities
Capital expenditures	(492)	(615)
Additions to prepaid royalties
Proceeds from disposals and divestitures	26,319
Purchases of short term investments	(119,176)	(26,787)
Proceeds from sales of short term investments	117,681	11,534
Investments in and advances to affiliates	(1,016)	(2,043)
Change in restricted cash		1,163
Cash provided by (used in) investing activities	23,316	(16,748)
Financing Activities
Contributions from parent
Payments on term loan	(4,875)	(4,125)
Net payments on other debt	(4,521)	(5,836)
Debt financing costs	(1,957)
Dividends paid	(2,123)	(6,367)
Transactions with affiliates, net	95,067	20,911
Cash used in financing activities	81,591	4,583
Increase (decrease) in cash and cash equivalents	(45,431)	(74,005)
Cash and cash equivalents, beginning of period	799,333	671,313
Cash and cash equivalents, end of period	753,902	597,308
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash provided by (used in) operating activities	142,978	120,755
Investing Activities
Capital expenditures	(13,962)	(53,907)
Additions to prepaid royalties	(591)	(9,142)
Proceeds from disposals and divestitures	1,876	714
Purchases of short term investments
Proceeds from sales of short term investments
Investments in and advances to affiliates	(2,226)	(2,383)
Change in restricted cash
Cash provided by (used in) investing activities	(14,903)	(64,718)
Financing Activities
Contributions from parent		128
Payments on term loan		0
Net payments on other debt		(128)
Debt financing costs
Dividends paid
Transactions with affiliates, net	(128,140)	(36,076)
Cash used in financing activities	(128,140)	(36,076)
Increase (decrease) in cash and cash equivalents	(65)	19,961
Cash and cash equivalents, beginning of period	100,418	100,468
Cash and cash equivalents, end of period	100,353	120,429
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash provided by (used in) operating activities	(32,915)	(15,624)
Investing Activities
Capital expenditures
Additions to prepaid royalties
Proceeds from disposals and divestitures
Purchases of short term investments
Proceeds from sales of short term investments
Investments in and advances to affiliates
Change in restricted cash
Cash provided by (used in) investing activities
Financing Activities
Contributions from parent
Payments on term loan
Net payments on other debt
Debt financing costs
Dividends paid
Transactions with affiliates, net	33,073	15,165
Cash used in financing activities	33,073	15,165
Increase (decrease) in cash and cash equivalents	158	(459)
Cash and cash equivalents, beginning of period	11,348	12,841
Cash and cash equivalents, end of period	11,506	12,382
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Cash provided by (used in) operating activities
Investing Activities
Capital expenditures
Additions to prepaid royalties
Proceeds from disposals and divestitures
Purchases of short term investments
Proceeds from sales of short term investments
Investments in and advances to affiliates		128
Change in restricted cash
Cash provided by (used in) investing activities		128
Financing Activities
Contributions from parent		(128)
Payments on term loan
Net payments on other debt
Debt financing costs
Dividends paid
Transactions with affiliates, net
Cash used in financing activities		(128)
Increase (decrease) in cash and cash equivalents
Cash and cash equivalents, beginning of period
Cash and cash equivalents, end of period