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Indebtedness (Future Maturities On Debt And Capital Lease Obligations) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Indebtedness [Abstract]    
2018 $ 1,103  
2019 5,297  
2020 12,936  
2021 12,941  
2022 12,965  
2023 and thereafter 14,173  
Total payments 59,415  
Imputed interest (6,901)  
Net long-term debt and capital lease obligations, of which $575 is current and $51,939 is noncurrent 52,514  
Net capital lease obligations, current 575 $ 561
Net capital lease obligations, noncurrent $ 51,939