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Leases:Other Information (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Lessee Disclosure [Abstract]      
Operating cash flows from operating leases $ 10,080 $ 9,744  
Operating cash flows from finance leases 1,768 1,659  
Financing cash flows from finance leases 1,127 936  
Right-of-use assets obtained in exchange for lease obligations, operating leases 9,532 6,628  
Right-of-use assets obtained in exchange for lease obligations, finance leases $ 0 $ 9,871  
Weighted-average remaining lease term, operating leases 7 years   8 years
Weighted-average remaining lease term, finance leases 15 years   15 years
Weighted-average discount rate, operating leases 5.90%   6.40%
Weighted average discount rate, finance leases 7.70%   7.70%
Lessee, Operating Lease, Liability, Payment, Due [Abstract]      
Remainder of 2021 $ 3,550    
2022 14,250    
2023 14,010    
2024 12,593    
2025 10,472    
Thereafter 30,723    
Total future minimum lease payments 85,598    
Less: interest (17,463)    
Total lease obligations 68,135    
Less: current obligations (10,667)    
Long-term lease obligations 57,468   $ 56,001
Finance Lease, Liability, Payment, Due [Abstract]      
Remainder of 2021 982    
2022 3,879    
2023 3,919    
2024 3,916    
2025 3,601    
Thereafter 37,801    
Total future minimum lease payments 54,098    
Less: interest (22,236)    
Total lease obligations 31,862    
Less: current obligations (1,599)    
Long-term lease obligations $ 30,263   $ 31,607
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current    
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current