Finance Obligation - Future minimum payments under finance obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Future minimum lease payments under finance leases
2022	$ 6,402
2023	6,306
2024	6,278
2025	9,177
2026	5,847
2027 and thereafter	773
Total future minimum lease payments	34,783
Less imputed lease interest	(5,454)
Total finance lease liabilities	29,329
Finance obligation
Future minimum lease payments under finance leases
2022	67,299
2023	65,472
2024	71,228
2025	57,068
2026	40,344
2027 and thereafter	28,843
Total future minimum lease payments	330,254
Less imputed lease interest	(76,570)
Total finance lease liabilities	253,684
Sale of Future Revenue - Debt
Future minimum lease payments under finance leases
2022	62,080
2023	62,080
2024	62,080
2025	56,824
2026	40,100
2027 and thereafter	28,518
Total future minimum lease payments	311,682
Less imputed lease interest	(74,991)
Total finance lease liabilities	236,691
Sale Leaseback Agreements
Future minimum lease payments under finance leases
2022	5,219
2023	3,392
2024	9,148
2025	244
2026	244
2027 and thereafter	325
Total future minimum lease payments	18,572
Less imputed lease interest	(1,579)
Total finance lease liabilities	$ 16,993	$ 23,900

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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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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 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).

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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).

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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).

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

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