Unit Based Awards (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Compensation Costs Related to Unit Based Plan

Amounts recognized in selling, general, and administrative expense in the consolidated financial statements with respect to these plans are as follows:

	For the Year Ended December 31,
	2020		2019		2018
Employees	$	1,204	$	1,226	$	1,098
Non-employee directors	218		198		126
Total unit-based compensation expense	$	1,422	$	1,424	$	1,224

Summary of Restricted Unit Activity

A summary of the restricted unit activity for the year ended December 31, 2020 is provided below:

	Number of Units		Weighted Average Grant-Date Fair Value Per Unit
Non-vested, beginning of year	379,019		$	13.91
Granted (TBRU)	81,000		$	2.53
Vested	(101,128)		$	13.95
Forfeited	(85,467)		$	13.90
Non-Vested, end of year	273,424		$	10.52
Aggregate intrinsic value, end of year	$	391

Summary of Aggregate Intrinsic Value and Fair Value of Units Vested

A summary of the restricted units’ aggregate intrinsic value (market value at vesting date) and fair value of units vested (market value at date of grant) during the years ended December 31, 2020, 2019 and 2018 is provided below:

	For the Year Ended December 31,
	2020		2019		2018
Aggregate intrinsic value of units vested	$	151	$	1,351	$	1,195
Fair value of units vested	$	1,427	$	1,551	$	2,250