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Lease Obligations (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases [Abstract]      
Lease expiration date Mar. 31, 2019    
Rent expenses $ 1.1 $ 0.9 $ 0.7