Debt - Fair Value Of Embedded Derivatives (Details) (Notes, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Notes
Fair value of Notes:
With the embedded derivatives	$ 106,170
Without the embedded derivatives	38,383
Estimated fair value of the embedded derivatives	$ 67,787	$ 65,947

Convertible Debt, Fair Value Disclosures, Excluding Embedded Derivative.

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- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Convertible Security

-URI http://asc.fasb.org/extlink&oid=6509036

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- Definition

Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

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