Debt (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Schedule of long-term debt

Debt obligations as of December 31, 2018 and 2019 consisted of the following (in thousands):

	December 31, 2018
			Unamortized Debt		Balance, Net of
	Principal Balances		Financing Costs		Financing Costs
7.5% Notes	$	50,000	$	58	$	49,942
NG Advantage debt		28,904		155		28,749
Other debt		1,024		—		1,024
Total debt		79,928		213		79,715
Less amounts due within one year		(4,811)		(99)		(4,712)
Total long-term debt	$	75,117	$	114	$	75,003

	December 31, 2019
			Unamortized Debt		Balance, Net of
	Principal Balances		Financing Costs		Financing Costs
7.5% Notes	$	50,000	$	17	$	49,983
NG Advantage debt		33,898		192		33,706
SG Facility		4,400		—		4,400
Other debt		796		—		796
Total debt		89,094		209		88,885
Less amounts due within one year		(56,097)		(84)		(56,013)
Total long-term debt	$	32,997	$	125	$	32,872

Summary of aggregate maturities of long term debt and capital lease obligations

The following is a summary of the aggregate maturities of debt obligations for each of the yearly periods subsequent to December 31, 2019 (in thousands):

	2020		2021		2022		2023		2024		Thereafter		Total
7.5% Notes	$	50,000	$	—	$	—	$	—	$	—	$	—	$	50,000
NG Advantage debt		5,857		6,092		6,300		11,407		4,242		—		33,898
SG Facility		—		—		—		—		4,400		—		4,400
Other debt		240		248		215		93		—		—		796
Total	$	56,097	$	6,340	$	6,515	$	11,500	$	8,642	$	—	$	89,094