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Derivative Financial Instruments (Narrative) (Details)
9 Months Ended
Nov. 28, 2018
Nov. 13, 2016
Sep. 30, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Derivative [Line Items]        
Loss in AOCI expected to be recognized in earnings over the next twelve months     $ (2,500,000)  
Not Designated As Hedging Instrument [Member]        
Derivative [Line Items]        
Derivative assets     0 $ 0
Derivative liabilities     $ 0 $ 0
Commodity Price Risk [Member] | Open Natural Gas Contracts        
Derivative [Line Items]        
Number of Contract Designated Hedges | item     0  
Currency Rate Risk – Sales and Purchases | Foreign Exchange        
Derivative [Line Items]        
Number of Contract Designated Hedges | item     0  
Interest Rate Swap Mature 2021 [Member]        
Derivative [Line Items]        
Derivatives swap maturity year   2021    
Interest Rate Swap Mature 2023 [Member]        
Derivative [Line Items]        
Derivatives swap maturity year 2023      
Interest Rate Swap Contracts [Member]        
Derivative [Line Items]        
LIBOR floor 0.00%      
Notional interest rate swap     $ 100,000,000.0  
Interest Rate Swap Mature 2025 [Member]        
Derivative [Line Items]        
Derivatives swap maturity year 2025