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Financial Instruments (Narrative) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 16, 2019
USD ($)
Dec. 31, 2018
USD ($)
Nov. 28, 2017
USD ($)
Nov. 27, 2017
USD ($)
Nov. 07, 2017
USD ($)
May 06, 2016
USD ($)
Apr. 08, 2016
USD ($)
Debt Instrument [Line Items]                
Maximum leverage ratio allowed 3.50              
Minimum interest coverage ratio required 3.00              
Leverage ratio 1.42              
Interest coverage ratio 13.03              
Finance lease obligation $ 19,190   $ 25,900          
Credit Agreement [Member]                
Debt Instrument [Line Items]                
Amount of credit facility           $ 68,500   $ 55,000
Amount of credit facility outstanding 42,400              
Additional amount that can be borrowed on facility $ 26,100              
LIBOR spread 1.375%              
Credit Agreement [Member] | Interest Rate Current Swap [Member]                
Debt Instrument [Line Items]                
Borrowings, revolving credit facility         $ 30,000   $ 12,000  
Notional amount   $ 350,000   $ 350,000        
Fixed interest rate in swap   2.03%   2.11%        
LIBOR rate   3.485%            
Amount paid to terminate agreement             $ 5,200  
Amount received from terminate agreement         $ 6,300      
Credit Agreement [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
LIBOR spread 1.25%              
Credit Agreement [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
LIBOR spread 1.75%