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Leases:Other Information (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Lessee Disclosure [Abstract]      
Operating cash flows from operating leases $ 9,744 $ 10,026  
Operating cash flows from finance leases 1,659 1,405  
Financing cash flows from finance leases 936 571  
Right-of-use assets obtained in exchange for lease obligations, operating leases 6,628 3,243  
Right-of-use assets obtained in exchange for lease obligations, finance leases $ 9,871 $ 2,655  
Weighted-average remaining lease term, operating leases 8 years   8 years
Weighted-average remaining lease term, finance leases 15 years   14 years
Weighted-average discount rate, operating leases 6.40%   6.50%
Weighted average discount rate, finance leases 7.70%   8.50%
Lessee, Operating Lease, Liability, Payment, Due [Abstract]      
Remainder of 2020 $ 3,233    
2021 13,005    
2022 12,236    
2023 11,945    
2024 11,190    
Thereafter 34,992    
Total future minimum lease payments 86,601    
Less: interest (19,932)    
Total lease obligations 66,669    
Less: current obligations (9,175)    
Long-term lease obligations 57,494   $ 58,029
Finance Lease, Liability, Payment, Due [Abstract]      
Remainder of 2020 974    
2021 3,917    
2022 3,923    
2023 3,963    
2024 3,959    
Thereafter 41,319    
Total future minimum lease payments 58,055    
Less: interest (24,618)    
Total lease obligations 33,437    
Less: current obligations (1,514)    
Long-term lease obligations $ 31,923   $ 23,419