Finance Obligations - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Sale Leaseback Transaction [Line Items]
Total operating lease, liabilities	$ 142,118
Short term operating lease obligation	19,915	$ 14,314
Long term operating lease obligation	122,203	99,624
Total finance lease liabilities	15,108
Short term finance lease obligation	2,728	903
Long term finance lease obligation	12,380	4,493
Sale Leaseback Agreements
Sale Leaseback Transaction [Line Items]
Total finance lease liabilities	19,538	23,900
Short term finance lease obligation	6,500	8,000
Long term finance lease obligation	13,000	15,900
Sale Leaseback Agreements \| Future Services [Member]
Sale Leaseback Transaction [Line Items]
Total finance lease liabilities	176,300	157,700
Short term finance lease obligation	27,300	24,200
Long term finance lease obligation	$ 149,000	$ 133,500

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

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=121609121&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=121603541&loc=SL77918627-209977

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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

+ References

Reference 1: 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=121603541&loc=SL77918627-209977

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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

+ References

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- Definition

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

+ References

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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+ References

No definition available.

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