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Leases:Other Information (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Lessee Disclosure [Abstract]      
Operating cash flows from operating leases $ 6,637    
Operating cash flows from finance leases 926    
Financing cash flows from finance leases 369    
Right-of-use assets obtained in exchange for lease obligations, operating leases 1,368    
Right-of-use assets obtained in exchange for lease obligations, finance leases $ 310    
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 8.80%    
Operating Lease Liabilities, Payments Due [Abstract]      
Remainder of 2019 $ 6,608    
2020 12,878    
2021 11,741    
2022 10,374    
2023 10,045    
Thereafter 41,338    
Total future minimum lease payments 92,984    
Less: interest (23,743)    
Total lease obligations 69,241 $ 72,400  
Less: current obligations (8,952)    
Long-term lease obligations 60,289 63,498 $ 0
Finance Lease Liabilities, Payments, Due [Abstract]      
Remainder of 2019 1,344    
2020 2,713    
2021 2,753    
2022 2,747    
2023 2,769    
Thereafter 30,177    
Total future minimum lease payments 42,503    
Less: interest (19,951)    
Total lease obligations 22,552    
Less: current obligations (851)    
Long-term lease obligations $ 21,701 $ 21,921 $ 0
[1] Upon adoption of the new lease standard, discount rates used for existing leases were established at January 1, 2019.