Debt - Fair Value Of Embedded Derivatives (Details) - Notes - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair value of 2033 Senior Notes:
With the embedded derivatives	$ 41,329
Without the embedded derivatives	29,538
Estimated fair value of the embedded derivatives	$ 11,791	$ 16,736

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=64837297&loc=SL5624163-113959

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- References

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