Notes Payable, Long Term Debt and Other Obligations - Other Schedules (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Interest expense associated with embedded derivatives	$ 32,071	$ 21,482	$ 10,684
Fair Value Of Derivatives [Roll Forward]
Beginning balance of derivative liability fair value	112,062us-gaap_DerivativeLiabilities	172,128us-gaap_DerivativeLiabilities	133,500us-gaap_DerivativeLiabilities
(Gain) loss from changes in fair value of embedded derivatives	(19,409)	(18,935)	7,476
Ending balance of derivative liability fair value	169,386us-gaap_DerivativeLiabilities	112,062us-gaap_DerivativeLiabilities	172,128us-gaap_DerivativeLiabilities
Unamortized Debt Discount [Roll Forward]
Amortization of beneficial conversion feature	(19,401)	(14,896)	(7,332)
Ending balance of unamortized discount	236,190
Convertible Debt [Member]
Unamortized Debt Discount [Roll Forward]
Beginning balance of unamortized discount	201,075	273,323	175,688
Decrease in unamortized discount due to conversion		(35,870)	(46,754)
Issuance of convertible notes - embedded derivative			98,204
Increase of convertible notes - beneficial conversion feature			64,201
Amortization of embedded derivatives	(32,071)	(21,482)	(10,684)
Amortization of beneficial conversion feature	(19,401)	(14,896)	(7,332)
Ending balance of unamortized discount	245,465	201,075	273,323
Convertible Debt [Member] \| 6.75% Senior Convertible Debentures [Member]
Debt Instrument [Line Items]
Interest expense associated with embedded derivatives	6,097	5,914	2,842
Convertible Debt [Member] \| 6.75% Variable Interest Senior Convertible Exchange Notes due 2014 [Member]
Debt Instrument [Line Items]
Interest expense associated with embedded derivatives	13,570	11,799	7,416
Unamortized Debt Discount [Roll Forward]
Beginning balance of unamortized discount	25,944
Ending balance of unamortized discount	0	25,944
Convertible Debt [Member] \| 3.875% Senior Convertible Debentures [Member]
Debt Instrument [Line Items]
Interest expense associated with embedded derivatives	0	155	57
Convertible Debt [Member] \| 7.5% Senior Convertible Debentures [Member]
Debt Instrument [Line Items]
Interest expense associated with embedded derivatives	5,553	3,614	369
Convertible Debt [Member] \| 5.5% Variable Interest Senior Convertible Debentures due 2020 [Member]
Debt Instrument [Line Items]
Interest expense associated with embedded derivatives	6,851	0	0
Unamortized Debt Discount [Roll Forward]
Beginning balance of unamortized discount	0
Ending balance of unamortized discount	98,831	0
Interest Rate Risk [Member]
Debt Instrument [Line Items]
Gain (loss) on changes in fair value of derivatives embedded within convertible debt	19,409	18,935	(7,476)
Interest Rate Risk [Member] \| Convertible Debt [Member] \| 6.75% Senior Convertible Debentures [Member]
Debt Instrument [Line Items]
Gain (loss) on changes in fair value of derivatives embedded within convertible debt	3,212	5,075	5,247
Fair Value Of Derivatives [Roll Forward]
Beginning balance of derivative liability fair value	6,607	11,682	16,929
Decrease in derivative due to conversion	(2,511)
(Gain) loss from changes in fair value of embedded derivatives	(3,212)	(5,075)	(5,247)
Ending balance of derivative liability fair value	884	6,607	11,682
Unamortized Debt Discount [Roll Forward]
Beginning balance of unamortized discount	19,312	30,383	35,704
Decrease in unamortized discount due to conversion	(7,898)
Amortization of embedded derivatives	(6,097)	(5,914)	(2,842)
Amortization of beneficial conversion feature	(5,317)	(5,157)	(2,479)
Ending balance of unamortized discount	0	19,312	30,383
Interest Rate Risk [Member] \| Convertible Debt [Member] \| 6.75% Variable Interest Senior Convertible Exchange Notes due 2014 [Member]
Debt Instrument [Line Items]
Gain (loss) on changes in fair value of derivatives embedded within convertible debt	8,990	9,625	9,940
Fair Value Of Derivatives [Roll Forward]
Beginning balance of derivative liability fair value	12,521	22,146	32,086
Decrease in derivative due to conversion	(3,531)
(Gain) loss from changes in fair value of embedded derivatives	(8,990)	(9,625)	(9,940)
Ending balance of derivative liability fair value	0	12,521	22,146
Unamortized Debt Discount [Roll Forward]
Beginning balance of unamortized discount	25,945	45,038	57,036
Decrease in unamortized discount due to conversion	(3,989)
Amortization of embedded derivatives	(13,570)	(11,799)	(7,416)
Amortization of beneficial conversion feature	(8,386)	(7,294)	(4,582)
Ending balance of unamortized discount	0	25,945	45,038
Interest Rate Risk [Member] \| Convertible Debt [Member] \| 3.875% Senior Convertible Debentures [Member]
Debt Instrument [Line Items]
Gain (loss) on changes in fair value of derivatives embedded within convertible debt	0	(1,417)	(22,281)
Fair Value Of Derivatives [Roll Forward]
Beginning balance of derivative liability fair value	0	39,714	84,485
Decrease in derivative due to conversion		(41,131)	(67,052)
(Gain) loss from changes in fair value of embedded derivatives	0	1,417	22,281
Ending balance of derivative liability fair value	0	0	39,714
Unamortized Debt Discount [Roll Forward]
Beginning balance of unamortized discount	0	36,107	82,948
Decrease in unamortized discount due to conversion		(35,870)	(46,754)
Amortization of embedded derivatives	0	(155)	(57)
Amortization of beneficial conversion feature	0	(82)	(30)
Ending balance of unamortized discount	0	0	36,107
Interest Rate Risk [Member] \| Convertible Debt [Member] \| 7.5% Senior Convertible Debentures [Member]
Debt Instrument [Line Items]
Gain (loss) on changes in fair value of derivatives embedded within convertible debt	5,296	5,652	(382)
Fair Value Of Derivatives [Roll Forward]
Beginning balance of derivative liability fair value	92,934	98,586	0
Increase from issuance			98,204
(Gain) loss from changes in fair value of embedded derivatives	(5,296)	(5,652)	382
Ending balance of derivative liability fair value	87,638	92,934	98,586
Unamortized Debt Discount [Roll Forward]
Beginning balance of unamortized discount	155,818	161,795	0
Issuance of convertible notes - embedded derivative			98,204
Increase of convertible notes - beneficial conversion feature			64,201
Amortization of embedded derivatives	(5,553)	(3,614)	(369)
Amortization of beneficial conversion feature	(3,631)	(2,363)	(241)
Ending balance of unamortized discount	146,634	155,818	161,795
Interest Rate Risk [Member] \| Convertible Debt [Member] \| 5.5% Variable Interest Senior Convertible Debentures due 2020 [Member]
Debt Instrument [Line Items]
Gain (loss) on changes in fair value of derivatives embedded within convertible debt	1,911	0	0
Fair Value Of Derivatives [Roll Forward]
Beginning balance of derivative liability fair value	0	0	0
Increase from issuance	82,775
(Gain) loss from changes in fair value of embedded derivatives	(1,911)	0	0
Ending balance of derivative liability fair value	80,864	0	0
Unamortized Debt Discount [Roll Forward]
Beginning balance of unamortized discount	0	0	0
Issuance of convertible notes - embedded derivative	82,775
Increase of convertible notes - beneficial conversion feature	24,974
Amortization of embedded derivatives	(6,851)	0	0
Amortization of beneficial conversion feature	(2,067)	0	0
Ending balance of unamortized discount	$ 98,831	$ 0	$ 0

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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