Summary of Significant Accounting Policies (Summary of Eligible Share Award Activity) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2017	Dec. 31, 2016
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance at beginning of the period/inception	$ 44,758	$ 36,261
Change in redemption value	619	8,600
Change in classification	988	3,716
Diversification of share awards	0	(3,819)
Amendment reclassification	(46,365)	0
Balance at end of period	$ 0	$ 44,758

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

Value of accretion of temporary equity to its redemption value during the period.

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No definition available.

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- Definition

Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

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No definition available.

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- Definition

Amount of increase (decrease) in temporary equity from changes classified as other.

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No definition available.

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- Definition

Reclassifications of Permanent to Temporary Equity, Change in Classification

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No definition available.

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- Definition

Reclassifications of Temporary to Permanent Equity, Amendment Reclassification

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No definition available.

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