Represents the number of grant instruments approves by the directors.

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Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
-Subparagraph (i)
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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

No definition available.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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-Publisher FASB
-Name Accounting Standards Codification
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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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.

+ References

No definition available.

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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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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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No definition available.

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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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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Percentage of vesting of share-based compensation awards.

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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
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- Definition

Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders.

+ References

No definition available.

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- Definition

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
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-Subparagraph (SX 210.3-04)
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Gross value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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No definition available.

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Equity Incentive Plans - Restricted Stock and Restricted Stock Units (Details) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended			9 Months Ended
	Jun. 12, 2017 USD ($) item	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares	Mar. 31, 2017 $ / shares shares	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Weighted - Average Fair Value
Weighted average period						1 year 2 months 12 days
Share-based compensation \| $						$ 11,576	$ 7,123
Chief Operating Officer
Weighted - Average Fair Value
Fair Value of grant \| $		$ 3,000
Performance period		3 years
Percentage of vesting		33.33%
PSUs
Number of RSUs and PSUs
Vested (in shares) \| shares						0
Weighted - Average Fair Value
Unrecognized compensation expense \| $		$ 8,100	$ 8,100			$ 8,100
Share-based compensation \| $			1,300		$ 2,400	4,800	2,800
RSUs
Weighted - Average Fair Value
Unrecognized compensation expense \| $		$ 10,200	10,200			10,200
Share-based compensation \| $			$ 2,400		$ 3,800	$ 6,800	$ 4,400
Common stock issued, restricted stock awards \| shares				409,846
Shares issued to satisfy tax withholding obligations \| shares				51,467
RSUs \| Director
Weighted - Average Fair Value
Number of grants \| item	2
RSUs \| First grant \| Director
Weighted - Average Fair Value
Fair Value of grant \| $	$ 500
Performance period	1 year
RSUs \| Second grant \| Director
Weighted - Average Fair Value
Fair Value of grant \| $	$ 800
Equity Appreciation Rights
Weighted - Average Fair Value
Accrued compensation and benefits \| $								$ 151,500
Omnibus Incentive 2015 Plan
Restricted Stock and Restricted Stock Units
Share reserved for issuance \| shares		4,612,623	4,612,623			4,612,623
Omnibus Incentive 2015 Plan \| PSUs
Weighted - Average Fair Value
Performance period						3 years
Omnibus Incentive 2015 Plan \| RSUs and PSUs
Number of RSUs and PSUs
Outstanding at beginning of the period \| shares				2,459,166		2,459,166
Granted (in shares) \| shares						183,086
Vested (in shares) \| shares						(409,846)
Forfeited (in shares) \| shares						(199,320)
Outstanding at end of the period \| shares		2,033,086	2,033,086			2,033,086
Weighted - Average Fair Value
Outstanding at beginning of the period \| $ / shares				$ 20.40		$ 20.40
Granted \| $ / shares						18.47
Vested \| $ / shares						20.40
Forfeited \| $ / shares						20.45
Outstanding at end of the period \| $ / shares		$ 20.22	$ 20.22			$ 20.22