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Earnings per Share (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator:
Net loss attributable to common stockholders	$ (69,208)	$ (111,666)	$ (48,136)	$ (54,992)	$ (58,647)	$ (46,654)	$ (51,050)	$ (43,691)	$ (284,002)	$ (200,042)	$ (132,118)
Denominator:
Weighted average common shares outstanding - basic and diluted									153,355,144	134,401,588	109,923,815
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									61,766,000	60,232,000	13,558,000
Common stock options
Denominator:
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									15,181,000	15,528,000	11,729,000
Convertible debt
Denominator:
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									40,850,000	40,850,000
Warrants
Denominator:
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									3,110,000	3,110,000	1,350,000
Restricted stock units (RSUs)
Denominator:
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									2,575,000	744,000	479,000
Vested restricted stock units, unissued
Denominator:
Antidilutive securities excluded from computation of diluted earnings per share (in shares)									50,000

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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