Exit and Termination Costs (Tables)

12 Months Ended

Dec. 31, 2020

Restructuring And Related Activities [Abstract]

Summary of Exit and Termination Costs

The following summarizes our exit and termination costs for the three years ended December 31, 2020, 2019 and 2018 (in thousands):

	Year Ended December 31,
	2020		2019			2018
Severance costs	$	5,909	$	7,535	$	(356	)
Transportation contract capacity releases (including accretion of    discount)		10,900		—		—
Divestiture contract obligation (including accretion of discount)		499,935		—		—
One-time minimum volume commitment contract payment		28,500		—		—
Stock-based compensation and other		2,165		1,971		(17	)
	$	547,409	$	9,506	$	(373	)

Exit and Termination Costs Included in Accrued Liabilities in Consolidated Balance Sheet

The following details the accrued exit and termination cost liability activity for the years ended December 31, 2020 and 2019 (in thousands):

	Exit Costs			Termination Costs
Balance at December 31, 2018	$	—		$	—
Accrued severance costs		—			7,535
Payments		—			(2,843	)
Balance at December 31, 2019		—			4,692
Accrued severance costs		—			5,909
Accrued contract obligations		490,114			—
Accretion of discount		20,720			—
Payments		(17,291	)		(9,147	)
Balance at December 31, 2020	$	493,543		$	1,454