Supplemental Consolidating Financial Information (Schedule of Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash provided by (used in) operating activities	$ (44,367)	$ (33,582)	$ 55,742
Investing Activities
Capital expenditures	(119,024)	(147,286)	(296,984)
Additions to prepaid royalties	(5,871)	(7,317)	(14,947)
Proceeds from disposals and divestitures	2,191	62,358	433,453
Proceeds from sale-leaseback transactions	0	0	34,919
Purchases of short term investments	(246,735)	(211,929)	(213,726)
Proceeds from sales of short term investments	290,205	205,611	194,537
Proceeds from sale of investments in equity investments and securities	2,259	9,464	0
Withdrawals (deposits) of restricted cash	(91,864)	(5,678)	3,453
Investments in and advances to affiliates, net	(11,502)	(16,657)	(15,260)
Cash provided by (used in) investing activities	(180,341)	(111,434)	125,445
Financing Activities
Contributions from parent			0
Proceeds from term loan and senior notes			644,000
Payments to retire debt			(628,660)
Payments on term loan	(19,500)	(19,500)	(17,250)
Net payments on other debt	(11,332)	(5,695)	(6,836)
Debt financing costs	0	(4,519)	(20,489)
Dividends paid	0	(2,123)	(25,475)
Other	0	(15)	0
Expenses related to debt restructuring	(27,910)	0	0
Transactions with affiliates, net	0	0	0
Cash used in financing activities	(58,742)	(31,852)	(54,710)
Increase (decrease) in cash and cash equivalents	(283,450)	(176,868)	126,477
Cash and cash equivalents, beginning of period	734,231	911,099	784,622
Cash and cash equivalents, end of period	450,781	734,231	911,099
Parent/Issuer [Member]
Cash provided by (used in) operating activities	(445,136)	(324,688)	(632,060)
Investing Activities
Capital expenditures	(1,108)	(2,700)	(3,320)
Additions to prepaid royalties	0	0	0
Proceeds from disposals and divestitures	0	57,625	0
Proceeds from sale-leaseback transactions			0
Purchases of short term investments	(246,735)	(211,929)	(213,726)
Proceeds from sales of short term investments	290,205	205,611	194,537
Proceeds from sale of investments in equity investments and securities	0	9,464
Withdrawals (deposits) of restricted cash	0	0	3,453
Investments in and advances to affiliates, net	(913)	(2,541)	(5,451)
Cash provided by (used in) investing activities	41,449	55,530	(24,507)
Financing Activities
Contributions from parent			0
Proceeds from term loan and senior notes			644,000
Payments to retire debt			(628,660)
Payments on term loan	(19,500)	(19,500)	(17,250)
Net payments on other debt	(2,692)	(1,258)	(6,324)
Debt financing costs		(2,219)	(19,864)
Dividends paid		(2,123)	(25,475)
Other		(15)
Expenses related to debt restructuring	(27,910)
Transactions with affiliates, net	219,250	67,125	838,160
Cash used in financing activities	169,148	42,010	784,587
Increase (decrease) in cash and cash equivalents	(234,539)	(227,148)	128,020
Cash and cash equivalents, beginning of period	572,185	799,333	671,313
Cash and cash equivalents, end of period	337,646	572,185	799,333
Guarantor Subsidiaries [Member]
Cash provided by (used in) operating activities	314,535	305,048	637,193
Investing Activities
Capital expenditures	(117,916)	(144,586)	(293,664)
Additions to prepaid royalties	(5,871)	(7,317)	(14,947)
Proceeds from disposals and divestitures	2,191	4,733	433,453
Proceeds from sale-leaseback transactions			34,919
Purchases of short term investments	0	0	0
Proceeds from sales of short term investments	0	0
Proceeds from sale of investments in equity investments and securities	2,259	0
Withdrawals (deposits) of restricted cash	0	0	0
Investments in and advances to affiliates, net	(10,589)	(14,116)	(10,321)
Cash provided by (used in) investing activities	(129,926)	(161,286)	149,440
Financing Activities
Contributions from parent			512
Proceeds from term loan and senior notes			0
Payments to retire debt			0
Payments on term loan	0	0	0
Net payments on other debt	(8,640)	(4,437)	(512)
Debt financing costs		0	0
Dividends paid		0	0
Other		0
Expenses related to debt restructuring	0
Transactions with affiliates, net	(225,899)	(89,385)	(786,683)
Cash used in financing activities	(234,539)	(93,822)	(786,683)
Increase (decrease) in cash and cash equivalents	(49,930)	49,940	(50)
Cash and cash equivalents, beginning of period	150,358	100,418	100,468
Cash and cash equivalents, end of period	100,428	150,358	100,418
Non-Guarantor Subsidiaries [Member]
Cash provided by (used in) operating activities	86,234	(13,942)	50,609
Investing Activities
Capital expenditures	0	0	0
Additions to prepaid royalties	0	0	0
Proceeds from disposals and divestitures	0	0	0
Proceeds from sale-leaseback transactions			0
Purchases of short term investments		0	0
Proceeds from sales of short term investments	0	0	0
Proceeds from sale of investments in equity investments and securities	0	0
Withdrawals (deposits) of restricted cash	(91,864)	(5,678)	0
Investments in and advances to affiliates, net	0		0
Cash provided by (used in) investing activities	(91,864)	(5,678)	0
Financing Activities
Contributions from parent			0
Proceeds from term loan and senior notes			0
Payments to retire debt			0
Payments on term loan	0	0	0
Net payments on other debt	0	0	0
Debt financing costs		(2,300)	(625)
Expenses related to debt restructuring	0
Transactions with affiliates, net	6,649	22,260	(51,477)
Cash used in financing activities	6,649	19,960	(52,102)
Increase (decrease) in cash and cash equivalents	1,019	340	(1,493)
Cash and cash equivalents, beginning of period	11,688	11,348	12,841
Cash and cash equivalents, end of period	12,707	11,688	11,348
Eliminations [Member]
Cash provided by (used in) operating activities	0	0
Investing Activities
Capital expenditures	0	0	0
Additions to prepaid royalties	0	0	0
Proceeds from disposals and divestitures	0	0	0
Proceeds from sale-leaseback transactions			0
Purchases of short term investments	0	0	0
Proceeds from sales of short term investments	0	0	0
Proceeds from sale of investments in equity investments and securities	0	0
Withdrawals (deposits) of restricted cash	0	0	0
Investments in and advances to affiliates, net	0		512
Cash provided by (used in) investing activities	0	0	512
Financing Activities
Contributions from parent			(512)
Proceeds from term loan and senior notes			0
Payments to retire debt			0
Payments on term loan	0	0	0
Net payments on other debt	0	0	0
Debt financing costs		0	0
Dividends paid		0	0
Other		0
Expenses related to debt restructuring	0
Transactions with affiliates, net	0	0	0
Cash used in financing activities	0	0	(512)
Increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents, beginning of period	0	0	0
Cash and cash equivalents, end of period	$ 0	$ 0	$ 0