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Credit Arrangement (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Credit Agreement [Member]    
Line of Credit Facility [Line Items]    
Original borrowing capacity $ 60.0 $ 50.0
Maturity date Mar. 31, 2021 Sep. 01, 2016
Sale leaseback transactions or real estate sales as covenant $ 100.0  
Current borrowing base 48.0  
Reduction in borrowing base due to deficit in fixed charges coverage ratio test $ 6.0  
Number of trailing months to compute fixed charges coverage ratio 12 months  
Net availability $ 42.0  
Letter of Credit [Member]    
Line of Credit Facility [Line Items]    
Outstanding letters of credit $ 0.0