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Leases:Other Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Lessee Disclosure [Abstract]      
Operating cash flows from operating leases $ 3,250 $ 3,329  
Operating cash flows from finance leases 586 485  
Financing cash flows from finance leases 380 264  
Right-of-use assets obtained in exchange for lease obligations, operating leases 0 2,608  
Right-of-use assets obtained in exchange for lease obligations, finance leases $ 0 $ 974  
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 6.30%   6.40%
Weighted average discount rate, finance leases 7.70%   7.70%
Lessee, Operating Lease, Liability, Payment, Due [Abstract]      
Remainder of 2021 $ 10,327    
2022 13,007    
2023 12,055    
2024 11,171    
2025 9,428    
Thereafter 25,545    
Total future minimum lease payments 81,533    
Less: interest (17,963)    
Total lease obligations 63,570    
Less: current obligations (10,133)    
Long-term lease obligations 53,437   $ 56,001
Finance Lease, Liability, Payment, Due [Abstract]      
Remainder of 2021 2,910    
2022 3,879    
2023 3,919    
2024 3,916    
2025 3,601    
Thereafter 37,801    
Total future minimum lease payments 56,026    
Less: interest (23,418)    
Total lease obligations 32,608    
Less: current obligations (1,549)    
Long-term lease obligations 31,059   $ 31,607
Lessee, Operating Lease Not Yet Commenced, Future Payments Due $ 7,300