Finance Obligation - Future minimum payments under finance obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Future minimum lease payments under finance leases
2021	$ 1,261
2022	1,234
2023	1,210
2024	1,293
2025 and thereafter	1,721
Total future minimum lease payments	6,719
Less imputed lease interest	(1,323)
Total finance lease liabilities	5,396
Finance obligation
Future minimum lease payments under finance leases
2021	50,997
2022	44,243
2023	42,417
2024	55,422
2025 and thereafter	53,385
Total future minimum lease payments	246,464
Less imputed lease interest	(64,911)
Total finance lease liabilities	181,553
Sale of Future Revenue - Debt
Future minimum lease payments under finance leases
2021	41,670
2022	39,268
2023	39,268
2024	39,268
2025 and thereafter	53,385
Total future minimum lease payments	212,859
Less imputed lease interest	(55,158)
Total finance lease liabilities	157,701
Sale Leaseback Agreements
Future minimum lease payments under finance leases
2021	9,327
2022	4,975
2023	3,149
2024	16,154
Total future minimum lease payments	33,605
Less imputed lease interest	(9,753)
Total finance lease liabilities	$ 23,852	$ 31,700

No definition available.

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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

+ Details

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Amount of lessee's undiscounted obligation for lease payments for finance lease.

+ References

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- Definition

Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for finance lease.

+ References

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