Supplemental Consolidating Financial Information (Schedule Of Condensed Consolidating Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Condensed Financial Statements, Captions [Line Items]
Cash provided by (used in) operating activities			$ (125,575)	$ (78,346)
Investing Activities
Capital expenditures	$ (76,481)	$ (81,292)	(99,361)	(95,746)
Additions to prepaid royalties			(409)	(3,341)
Proceeds from disposals and divestitures			991	43,245
Purchases of marketable securities			(161,336)	(168,951)
Proceeds from sales of short term investments			157,729	166,018
Investments in and advances to affiliates			(5,138)	(9,501)
Cash used in investing activities			(107,524)	(68,276)
Financing Activities
Payments on term loan			(9,750)	(9,750)
Debt financing costs			0	(1,957)
Net payments on other debt			(9,826)	(9,390)
Expenses related to debt restructuring			(4,016)	0
Dividends paid			0	(2,123)
Withdrawals (deposits) of restricted cash			(37,885)	(1,103)
Transactions with affiliates, net			0	0
Cash used in financing activities			(61,477)	(24,323)
Decrease in cash and cash equivalents			(294,576)	(170,945)
Cash and cash equivalents, beginning of period		740,154	734,231	911,099
Cash and cash equivalents, end of period	439,655	740,154	439,655	740,154
Parent/Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Cash provided by (used in) operating activities			(295,792)	(268,382)
Investing Activities
Capital expenditures			(815)	(660)
Additions to prepaid royalties			0	0
Proceeds from disposals and divestitures			0	39,132
Purchases of marketable securities			(161,336)	(168,951)
Proceeds from sales of short term investments			157,729	166,018
Investments in and advances to affiliates			(788)	(1,581)
Cash used in investing activities			(5,210)	33,958
Financing Activities
Payments on term loan			(9,750)	(9,750)
Debt financing costs				(1,957)
Net payments on other debt			(5,973)	(7,547)
Expenses related to debt restructuring			(4,016)
Dividends paid				(2,123)
Withdrawals (deposits) of restricted cash			0	0
Transactions with affiliates, net			116,224	84,719
Cash used in financing activities			96,485	63,342
Decrease in cash and cash equivalents			(204,517)	(171,082)
Cash and cash equivalents, beginning of period			572,185	799,333
Cash and cash equivalents, end of period	367,668	628,251	367,668	628,251
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash provided by (used in) operating activities			163,345	196,505
Investing Activities
Capital expenditures			(98,546)	(95,086)
Additions to prepaid royalties			(409)	(3,341)
Proceeds from disposals and divestitures			991	4,113
Purchases of marketable securities			0	0
Proceeds from sales of short term investments			0	0
Investments in and advances to affiliates			(4,350)	(7,920)
Cash used in investing activities			(102,314)	(102,234)
Financing Activities
Payments on term loan			0	0
Debt financing costs				0
Net payments on other debt			(3,853)	(1,843)
Expenses related to debt restructuring			0
Dividends paid				0
Withdrawals (deposits) of restricted cash			0	0
Transactions with affiliates, net			(146,968)	(92,486)
Cash used in financing activities			(150,821)	(94,329)
Decrease in cash and cash equivalents			(89,790)	(58)
Cash and cash equivalents, beginning of period			150,358	100,418
Cash and cash equivalents, end of period	60,568	100,360	60,568	100,360
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash provided by (used in) operating activities			6,872	(6,469)
Investing Activities
Capital expenditures			0	0
Additions to prepaid royalties			0	0
Proceeds from disposals and divestitures			0	0
Purchases of marketable securities			0	0
Proceeds from sales of short term investments			0	0
Investments in and advances to affiliates			0	0
Cash used in investing activities			0	0
Financing Activities
Payments on term loan			0	0
Debt financing costs				0
Net payments on other debt			0	0
Expenses related to debt restructuring			0
Dividends paid				0
Withdrawals (deposits) of restricted cash			(37,885)	(1,103)
Transactions with affiliates, net			30,744	7,767
Cash used in financing activities			(7,141)	6,664
Decrease in cash and cash equivalents			(269)	195
Cash and cash equivalents, beginning of period			11,688	11,348
Cash and cash equivalents, end of period	11,419	11,543	11,419	11,543
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Cash provided by (used in) operating activities			0	0
Investing Activities
Capital expenditures			0	0
Additions to prepaid royalties			0	0
Proceeds from disposals and divestitures			0	0
Purchases of marketable securities			0	0
Proceeds from sales of short term investments			0	0
Investments in and advances to affiliates			0	0
Cash used in investing activities			0	0
Financing Activities
Payments on term loan			0	0
Debt financing costs				0
Net payments on other debt			0	0
Expenses related to debt restructuring			0
Dividends paid				0
Withdrawals (deposits) of restricted cash			0	0
Transactions with affiliates, net			0	0
Cash used in financing activities			0	0
Decrease in cash and cash equivalents			0	0
Cash and cash equivalents, beginning of period			0	0
Cash and cash equivalents, end of period	$ 0	$ 0	$ 0	$ 0