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Indebtedness (Future Maturities On Debt And Capital Lease Obligations) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Indebtedness [Abstract]    
2018 $ 1,468  
2019 3,755  
2020 8,305  
2021 8,309  
2022 8,335  
2023 and thereafter 14,379  
Total payments 44,551  
Imputed interest (7,129)  
Net long-term debt and capital lease obligations, of which $561 is current and $36,861 is noncurrent 37,422  
Net capital lease obligations, current 561 $ 1,688
Net capital lease obligations, noncurrent $ 36,861