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Equity-Based Compensation - Summarized Information Related to Awards (Details)	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested shares outstanding, beginning of period (shares) | shares	5,736,167
Granted (shares) | shares	3,516,579
Vested (shares) | shares	(3,465,313)
Forfeited (shares) | shares	(3,191,398)
Nonvested shares outstanding, end of period (shares) | shares	2,596,035
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested shares outstanding, beginning of period, weighted average grant date fair value (dollars per share) | $ / shares	$ 8.77
Granted, weighted average grant date fair value (dollars per share) | $ / shares	3.06
Vested, weighted average grant date fair value (dollars per share) | $ / shares	6.82
Forfeited, weighted average grant date fair value (dollars per share) | $ / shares	3.19
Nonvested shares outstanding, end of period, weighted average grant date fair value (dollars per share) | $ / shares	$ 9.39
Performance Share Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested shares outstanding, beginning of period (shares) | shares	3,027,224
Granted (shares) | shares	2,429,747
Vested (shares) | shares	(672,606)
Forfeited (shares) | shares	(2,396,524)
Nonvested shares outstanding, end of period (shares) | shares	2,387,841
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested shares outstanding, beginning of period, weighted average grant date fair value (dollars per share) | $ / shares	$ 9.12
Granted, weighted average grant date fair value (dollars per share) | $ / shares	2.56
Vested, weighted average grant date fair value (dollars per share) | $ / shares	8.61
Forfeited, weighted average grant date fair value (dollars per share) | $ / shares	3.12
Nonvested shares outstanding, end of period, weighted average grant date fair value (dollars per share) | $ / shares	$ 8.17
Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested shares outstanding, beginning of period (shares) | shares	362,002
Granted (shares) | shares	242,500
Vested (shares) | shares	(109,199)
Forfeited (shares) | shares	(314,676)
Nonvested shares outstanding, end of period (shares) | shares	180,627
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested shares outstanding, beginning of period, weighted average grant date fair value (dollars per share) | $ / shares	$ 19.09
Granted, weighted average grant date fair value (dollars per share) | $ / shares	8.65
Vested, weighted average grant date fair value (dollars per share) | $ / shares	13.52
Forfeited, weighted average grant date fair value (dollars per share) | $ / shares	8.64
Nonvested shares outstanding, end of period, weighted average grant date fair value (dollars per share) | $ / shares	$ 9.72
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested shares outstanding, beginning of period (shares) | shares	16,170
Granted (shares) | shares	16,170
Vested (shares) | shares	(16,170)
Forfeited (shares) | shares	0
Nonvested shares outstanding, end of period (shares) | shares	16,170
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested shares outstanding, beginning of period, weighted average grant date fair value (dollars per share) | $ / shares	$ 18.57
Granted, weighted average grant date fair value (dollars per share) | $ / shares	16.69
Vested, weighted average grant date fair value (dollars per share) | $ / shares	18.57
Forfeited, weighted average grant date fair value (dollars per share) | $ / shares	0
Nonvested shares outstanding, end of period, weighted average grant date fair value (dollars per share) | $ / shares	$ 16.69

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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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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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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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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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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