Operating and Finance Lease Liabilities - Future minimum lease payments under operating and finance leases (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Future minimum lease payments under operating lease
2021	$ 28,536
2022	27,138
2023	26,464
2024	25,947
2025 and thereafter	50,362
Total future minimum lease payments	158,447
Less imputed lease interest	(44,509)
Total operating lease, liabilities	113,938
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
Total future minimum payments	165,166
Future minimum lease payments under operating and finance leases
2021	29,797
2022	28,372
2023	27,674
2024	27,240
2025 and thereafter	52,083
Less imputed lease interest	(45,832)
Total	$ 119,334

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

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

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Amount of lessee's undiscounted obligation for lease payment for operating and finance lease to be paid after fifth fiscal year following current fiscal year.

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Amount of lessee's undiscounted obligation for lease payment for operating and finance lease to be paid in fourth fiscal year following current fiscal year.

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Amount of lessee's undiscounted obligation for lease payment for operating and finance lease to be paid in next fiscal year following current fiscal year.

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Amount of lessee's undiscounted obligation for lease payment for operating and finance lease to be paid in third fiscal year following current fiscal year.

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Amount of lessee's undiscounted obligation for lease payment for operating and finance lease to be paid in second fiscal year following current fiscal year.

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

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

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

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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).

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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).

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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).

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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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Amount of lessee's undiscounted obligation for lease payment for operating lease.

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Amount of lessee's undiscounted obligation for lease payment for operating lease due 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).

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Amount of lessee's undiscounted obligation for lease payment for operating 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).

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Amount of lessee's undiscounted obligation for lease payment for operating 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 operating 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).

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Amount of lessee's undiscounted obligation for lease payment for operating 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 operating lease.

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

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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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