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Leases:Other Information (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Lessee Disclosure [Abstract]      
Operating cash flows from operating leases $ 10,026    
Operating cash flows from finance leases 1,405    
Financing cash flows from finance leases 571    
Right-of-use assets obtained in exchange for lease obligations, operating leases 3,243    
Right-of-use assets obtained in exchange for lease obligations, finance leases $ 2,655    
Weighted-average remaining lease term, operating leases 9 years    
Weighted-average remaining lease term, finance leases 15 years    
Weighted-average discount rate, operating leases [1] 6.50%    
Weighted-average discount rate, finance leases 8.50%    
Lessee, Operating Lease, Liability, Payment, Due [Abstract]      
Remainder of 2019 $ 3,371    
2020 13,239    
2021 12,102    
2022 10,735    
2023 10,406    
Thereafter 41,880    
Total future minimum lease payments 91,733    
Less: interest (22,899)    
Total lease obligations 68,834 $ 72,400  
Less: current obligations (9,243)    
Long-term lease obligations 59,591 63,498 $ 0
Finance Lease, Liability, Payment, Due [Abstract]      
Remainder of 2019 726    
2020 3,009    
2021 3,048    
2022 3,044    
2023 3,071    
Thereafter 31,917    
Total future minimum lease payments 44,815    
Less: interest (20,110)    
Total lease obligations 24,705    
Less: current obligations (1,044)    
Long-term lease obligations $ 23,661 $ 21,921 $ 0
[1] Upon adoption of the new lease standard, discount rates used for existing leases were established at January 1, 2019.