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Leases:Other Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Lessee Disclosure [Abstract]      
Operating cash flows from operating leases $ 3,301    
Operating cash flows from finance leases 461    
Financing cash flows from finance leases 181    
Right-of-use assets obtained in exchange for lease obligations, operating leases 585    
Right-of-use assets obtained in exchange for lease obligations, finance leases $ 0    
Weighted-average remaining lease term, operating leases 9 years    
Weighted-average remaining lease term, finance leases 16 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 $ 9,859    
2020 12,737    
2021 11,598    
2022 10,211    
2023 9,881    
Thereafter 41,189    
Total future minimum lease payments 95,475    
Less imputed interest (24,735)    
Total lease obligations 70,740 $ 72,400  
Less current obligations (8,838)    
Long-term lease obligations 61,902 63,498 $ 0
Finance Lease Liabilities, Payments, Due [Abstract]      
Remainder of 2019 1,937    
2020 2,617    
2021 2,656    
2022 2,694    
2023 2,740    
Thereafter 30,177    
Total future minimum lease payments 42,821    
Less imputed interest (20,390)    
Total lease obligations 22,431    
Less current obligations (744)    
Long-term lease obligations $ 21,687 $ 21,921 $ 0
[1] Upon adoption of the new lease standard, discount rates used for existing leases were established at January 1, 2019.