Equity-Based Compensation - Activity for Restricted Stock Units (Details) $ / shares in Units, $ in Thousands	9 Months Ended
Sep. 30, 2016 USD ($) $ / shares shares
Restricted Stock Units
Options, Beginning Balance	28,057
Options, Exercised	(28,057)
Restricted Stock Units exchanged for Class A Common Stock [Member]
Restricted Stock Units
Restricted stock, shares vested	33,288
Restricted Stock Units (RSUs)
Restricted Stock Units
Restricted Stock Units, Balance as of January 1, 2016	96,765
Restricted Stock Units, Granted	89,359
Restricted stock, shares vested	5,334
Restricted Stock Units, Forfeited	(43,688)
Restricted Stock Units, Balance as of September 30, 2016	137,102
Weighted average grant date fair value per share \| $ / shares	$ 32.19
Unrecognized RSU expense \| $	$ 3,122
Period for recognition of RSU compensation expense	1 year 1 month 6 days
Additional shares available to grant under plan (in shares)	2,165,277

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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- Definition

Net number of non-option equity instruments granted to participants.

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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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 difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of options outstanding, including both vested and non-vested options.

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- Definition

Number of share options (or share units) exercised during the current period.

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