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Leases:Other Information (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Lessee Disclosure [Abstract]      
Operating cash flows from operating leases $ 6,656 $ 6,588  
Operating cash flows from finance leases 1,177 1,044  
Financing cash flows from finance leases 752 591  
Right-of-use assets obtained in exchange for lease obligations, operating leases 0 5,769  
Right-of-use assets obtained in exchange for lease obligations, finance leases $ 0 $ 9,338  
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 6.40%   6.40%
Weighted average discount rate, finance leases 7.70%   7.70%
Lessee, Operating Lease, Liability, Payment, Due [Abstract]      
Remainder of 2021 $ 6,922    
2022 13,007    
2023 12,055    
2024 11,171    
2025 9,428    
Thereafter 25,545    
Total future minimum lease payments 78,128    
Less: interest (17,016)    
Total lease obligations 61,112    
Less: current obligations (10,145)    
Long-term lease obligations 50,967   $ 56,001
Finance Lease, Liability, Payment, Due [Abstract]      
Remainder of 2021 1,948    
2022 3,879    
2023 3,919    
2024 3,916    
2025 3,601    
Thereafter 37,801    
Total future minimum lease payments 55,064    
Less: interest (22,828)    
Total lease obligations 32,236    
Less: current obligations (1,575)    
Long-term lease obligations 30,661   $ 31,607
Lessee, Operating Lease Not Yet Commenced, Future Payments Due $ 7,300