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Stock-Based Compensation - Restricted Stock and Restricted Stock Units (Details) shares in Thousands	6 Months Ended
	Jun. 30, 2019 $ / shares shares
Restricted shares
Number of Shares
Number of shares unvested, beginning of period (in shares) | shares	890
Number of shares, granted (in shares) | shares	0
Number of shares, vested (in shares) | shares	(198)
Number of shares, forfeited (in shares) | shares	0
Number of shares unvested, end of period (in shares) | shares	692
Weighted Average Grant Date Fair Value
Weighted average grant date fair value, beginning of period (in USD per share) | $ / shares	$ 4.25
Weighted average grant date fair value, granted (in USD per share) | $ / shares	0
Weighted average grante date fair value, vested (in USD per share) | $ / shares	4.25
Weighted average grant date fair value, forfeited (in USD per share) | $ / shares	0
Weighted average grant date fair value, end of period (in USD per share) | $ / shares	$ 4.25
Restricted stock units
Number of Shares
Number of shares unvested, beginning of period (in shares) | shares	1,129
Number of shares, granted (in shares) | shares	2,003
Number of shares, vested (in shares) | shares	(1)
Number of shares, forfeited (in shares) | shares	(144)
Number of shares unvested, end of period (in shares) | shares	2,987
Weighted Average Grant Date Fair Value
Weighted average grant date fair value, beginning of period (in USD per share) | $ / shares	$ 18.90
Weighted average grant date fair value, granted (in USD per share) | $ / shares	29.10
Weighted average grante date fair value, vested (in USD per share) | $ / shares	23.00
Weighted average grant date fair value, forfeited (in USD per share) | $ / shares	20.84
Weighted average grant date fair value, end of period (in USD per share) | $ / shares	$ 25.65

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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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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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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- Definition

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

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- Definition

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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