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Details Of Certain Balance Sheet Accounts (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Details Of Certain Balance Sheet Accounts [Abstract]    
Deductible component of workers compensation program $ 0.4  
Letters of credit secure compensation program 16.7 $ 16.7
Loss reserve associated with compensation policies 0.7 $ 0.8
Cash escrow and deposit $ 0.8