Stock-based Compensation - Performance Share Unit Awards - Activity (Details) - Performance Share Unit Awards	3 Months Ended
Mar. 31, 2017 $ / shares shares
Awards
Unvested at the beginning of the period (in shares) \| shares	942,073
Unvested at the end of the period (in shares) \| shares	942,073
Weighted Average Grant Date Fair Value per Share
Unvested at the beginning of the period (in dollars per share) \| $ / shares	$ 6.25
Unvested at the end of the period (in dollars per share) \| $ / shares	$ 6.25

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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