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Leases:Other Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Lessee Disclosure [Abstract]      
Operating cash flows from operating leases $ 3,329 $ 3,301  
Operating cash flows from finance leases 485 461  
Financing cash flows from finance leases 264 181  
Right-of-use assets obtained in exchange for lease obligations, operating leases 2,608 585  
Right-of-use assets obtained in exchange for lease obligations, finance leases $ 974 $ 0  
Weighted-average remaining lease term, operating leases 8 years   8 years
Weighted-average remaining lease term, finance leases 14 years   14 years
Weighted-average discount rate, operating leases 6.40%   6.50%
Weighted-average discount rate, finance leases 8.50%   8.50%
Lessee, Operating Lease, Liability, Payment, Due [Abstract]      
Remainder of 2020 $ 9,990    
2021 12,759    
2022 11,407    
2023 11,093    
2024 10,502    
Thereafter 33,185    
Total future minimum lease payments 88,936    
Less: interest (21,224)    
Total lease obligations 67,712    
Less: current obligations (9,345)    
Long-term lease obligations 58,367   $ 58,029
Finance Lease, Liability, Payment, Due [Abstract]      
Remainder of 2020 2,436    
2021 3,284    
2022 3,278    
2023 3,306    
2024 3,289    
Thereafter 28,926    
Total future minimum lease payments 44,519    
Less: interest (19,306)    
Total lease obligations 25,213    
Less: current obligations (1,294)    
Long-term lease obligations 23,919   $ 23,419
Minimum lease payment amount for operating leases signed but not yet commenced $ 3,900