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Details Of Certain Balance Sheet Accounts (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Details Of Certain Balance Sheet Accounts [Abstract]    
Prepaid health insurance $ 2,238 $ 490
Prepaid workers' compensation and liability insurance 1,190 1,526
Prepaid rent 568 578
Workers' compensation insurance receivable 747 1,303
Other 1,255 961
Prepaid expenses and other current assets $ 5,998 $ 4,858