Equity-based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Activity Related to Restricted Stock Unit Awards

	For the Year Ended December 31, 2018
	2018					2017				2016
	Number of Shares			Fair Value per Unit at Award Date		Number of Shares		Fair Value per Unit at Award Date		Number of Shares			Fair Value per Unit at Award Date
Non-vested at beginning of period		672,750		$	5.14		672,750	$	5.14		258,375		$	13.43
Units deemed improbable to vest		—			—		—		—		(258,375	)		13.43
Expired during the period		(672,750	)		5.14		—		—		—			—
Amended grants		—			—		—		—		395,250			5.14
Forfeited during the period		(707	)		26.50		—		—		—			—
Granted during the period		276,451			26.49		—		—		277,500			5.14
Non-vested at end of period		275,744		$	26.49		672,750	$	5.14		672,750		$	5.14