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Leases Leases: Other Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lessee Disclosure [Abstract]    
Operating cash flows from operating leases $ 13,018 $ 13,508
Operating cash flows from finance leases 2,271 1,862
Financing cash flows from finance leases 1,307 783
Right-of-use assets obtained in exchange for lease obligations, operating leases 8,310 4,211
Right-of-use assets obtained in exchange for lease obligations, finance leases $ 9,969 $ 2,637
Weighted-average remaining lease term (years), operating leases 8 years 8 years
Weighted-average remaining lease term (years), finance leases 15 years 14 years
Weighted average discount rate, percent, operating leases [1] 6.40% 6.50%
Weighted average discount rate, percent, finance leases 7.70% 8.50%
Lessee, Operating Lease, Liability, Payment, Due [Abstract]    
2021 $ 13,593  
2022 13,024  
2023 12,073  
2024 11,189  
2025 9,448  
Thereafter 25,545  
Total future minimum lease payments 84,872  
Less: interest (18,945)  
Total lease obligations 65,927  
Long-term lease obligations 56,001 $ 58,029
Finance Lease, Liability, Payment, Due [Abstract]    
2021 3,924  
2022 3,930  
2023 3,970  
2024 3,967  
2025 3,607  
Thereafter 37,801  
Total future minimum lease payments 57,199  
Less: interest (24,035)  
Total lease obligations 33,164  
Long-term lease obligations 31,607 $ 23,419
Lessee, Operating Lease Not Yet Commenced, Future Payments Due 7,300  
Other Current Liabilities    
Lessee, Operating Lease, Liability, Payment, Due [Abstract]    
Less: current obligations (9,926)  
Finance Lease, Liability, Payment, Due [Abstract]    
Less: current obligations $ (1,557)  
[1] Upon adoption of the new lease standard, discount rates used for existing leases were established at January 1, 2019.