Fair Value Measurements (Embedded Derivative) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($)
Fair Value Measurements
Beginning Balance	$ (193,077)
Gain on embedded derivative	47,794
Transfer to mezzanine equity	145,283
Ending Balance

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

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

Name:	us-gaap_EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant