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Leases:Other Information (Details) - USD ($)
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Lessee Disclosure [Abstract]      
Operating cash flows from operating leases $ 6,588,000 $ 6,637,000  
Operating cash flows from finance leases 1,044,000 926,000  
Financing cash flows from finance leases 591,000 369,000  
Right-of-use assets obtained in exchange for lease obligations, operating leases 5,769,000 1,368,000  
Right-of-use assets obtained in exchange for lease obligations, finance leases $ 9,338,000 $ 310,000  
Weighted-average remaining lease term, operating leases 8 years   8 years
Weighted-average remaining lease term, finance leases 16 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 $ 6,398,000    
2021 12,858,000    
2022 11,937,000    
2023 11,636,000    
2024 11,060,000    
Thereafter 34,992,000    
Total future minimum lease payments 88,881,000    
Less: interest (20,924,000)    
Total lease obligations 67,957,000    
Less: current obligations (9,044,000)    
Long-term lease obligations 58,913,000   $ 58,029,000
Finance Lease, Liability, Payment, Due [Abstract]      
Remainder of 2020 1,908,000    
2021 3,853,000    
2022 3,859,000    
2023 3,898,000    
2024 3,893,000    
Thereafter 40,967,000    
Total future minimum lease payments 58,378,000    
Less: interest (25,129,000)    
Total lease obligations 33,249,000    
Less: current obligations (1,433,000)    
Long-term lease obligations $ 31,816,000   $ 23,419,000