Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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Balance Type:	na
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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph e

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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Balance Type:	na
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- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

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Balance Type:	debit
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- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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-Topic 470

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-Paragraph 2

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

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-Section 40

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629

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Subsequent Event PARTIAL REPURCHASE OF THE 4.25% CONVERTIBLE SENIOR NOTES DUE 2016 (Details) (USD $)	12 Months Ended			2 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 27, 2015	Feb. 05, 2015	Feb. 28, 2013	Feb. 05, 2013
Subsequent Event [Line Items]
Loss due to unamortized discount on Convertible Notes written off	$ (521,000)	$ (6,275,000)	$ 0
Amount funding Convertible Notes repurchase - Tranche C					138,000,000us-gaap_DebtInstrumentRepurchaseAmount
4.25% Convertible Senior Notes
Subsequent Event [Line Items]
Stated interest rate on debt instrument	4.25%	4.25%
4.25% Convertible Senior Notes \| 4.25% Convertible Senior Notes due 2016
Subsequent Event [Line Items]
Stated interest rate on debt instrument	4.25%
Repurchase percentage of Convertible Notes				100.00%
Debt Instrument, Repurchased Face Amount	151,000,000
Principal amount of Convertible Notes repurchased	200,000,000				49,000,000
Loss due to unamortized discount on Convertible Notes written off				13,000,000
Senior Notes [Member] \| 7.875% Senior Secured Notes due 2021
Subsequent Event [Line Items]
Stated interest rate on debt instrument	7.875%	7.875%				7.875%	7.875%
Repurchase percentage of Convertible Notes	103.00%
Principal amount of Convertible Notes repurchased						425,000,000
Amount funding Convertible Notes repurchase - Tranche C					$ 150,900,000