Equity-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Performance-Based Unvested Stock Unit and Performance-Based Unvested Stock Unit

A summary of the 2019 performance-based unvested stock and performance-based unvested stock unit awards are presented in the following table:    

	Shares/units (in thousands)			Weighted Average Grant-Date Fair Value
Unvested at December 31, 2018		—		$	—
Granted		2,927		$	2.59
Forfeited		(642	)	$	3.20
Unvested at December 31, 2019		2,285		$	2.42

Summary of Performance-Based Unvested Stock Unit Activity

A summary of performance-based unvested stock unit activity is as follows:

	Units (in thousands)			Weighted Average Grant-Date Fair Value
Unvested at December 31, 2016		261		$	17.98
Vested		(141	)		17.90
Forfeited		(6	)		18.23
Unvested at December 31, 2017		114		$	18.06
Vested		(114	)		18.06
Forfeited		—			—
Unvested at December 31, 2018		—		$	—
Vested		—			—
Forfeited		—			—
Unvested at December 31, 2019		—		$	—

Summary of Activity of Unvested Restricted Stock and Stock Unit Awards

A summary of the activity of our unvested restricted stock and stock unit awards are presented in the following table:

	Shares/units (in thousands)			Weighted Average Grant-Date Fair Value
Unvested at December 31, 2016		1,175		$	11.30
Granted		496			12.43
Vested and distributed		(306	)		11.91
Forfeited		(58	)		12.28
Unvested at December 31, 2017		1,307		$	11.55
Granted		730			9.35
Vested and distributed		(457	)		10.91
Forfeited		(164	)		11.31
Unvested at December 31, 2018		1,416		$	10.65
Granted		437			5.39
Vested and distributed		(779	)		9.16
Forfeited		(81	)		10.74
Unvested at December 31, 2019		993		$	9.50

Summary of Vesting Provisions for Restricted Stock and Stock Unit Awards

The vesting provisions for the restricted stock and stock unit awards and the related number of shares granted during the year ended December 31 are as follows:

	Shares/units (in thousands)
Vesting Terms	2019		2018		2017
50% immediately and 50% on the 1 year anniversary of grant date		162		—		—
100% immediately		186		132		106
33.3% per year for three years		89		452		85
100% on February 14, 2020		—		—		305
100% on July 31, 2018		—		146		—
Total restricted stock and stock units granted		437		730		496