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Derivative Financial Instruments (Narrative) (Details)
6 Months Ended
Mar. 11, 2020
Mar. 06, 2020
Nov. 28, 2018
Nov. 13, 2016
Jun. 30, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Derivative [Line Items]            
Loss in AOCI expected to be recognized in earnings over the next twelve months         $ (9,300,000)  
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% 0.00% 0.00%      
Interest Rate Swap Contracts [Member] | Forward Starting Swap [Member]            
Derivative [Line Items]            
LIBOR floor     0.00%      
Interest Rate Swap Mature 2025 [Member]            
Derivative [Line Items]            
Derivatives swap maturity year     2025      
Interest Rate Swap Mature 2022 [Member]            
Derivative [Line Items]            
Derivatives swap maturity year   2022        
Interest Rate Swap Mature 2024 [Member]            
Derivative [Line Items]            
Derivatives swap maturity year 2024