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Long-Term Debt And Other Long-Term Liabilities Long-Term Debt And Other Long-Term Liabilities (Capital Leases) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Beginning October 1,    
2017 $ 6,168  
2018 6,168  
2019 6,168  
2020 5,310  
Total future payments 23,814  
Less payments related to:    
Maintenance 6,320  
Interest 1,333  
Present value of future minimum payments $ 16,161 $ 18,918