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Financial Instruments (Narrative) (Details)
$ in Thousands
12 Months Ended
Nov. 07, 2017
USD ($)
Apr. 08, 2016
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 16, 2019
USD ($)
Nov. 28, 2017
USD ($)
Nov. 27, 2017
USD ($)
May 06, 2016
USD ($)
Debt Instrument [Line Items]                  
Principal payments due on long-term debt in two years     $ 398,000            
Cash payments of interest     15,100 $ 17,400 $ 18,800        
Finance lease obligation     $ 17,559 $ 24,535          
Maximum leverage ratio allowed     3.50            
Minimum interest coverage ratio required     3.00            
Leverage ratio     1.34            
Interest coverage ratio     14.39            
Line of Credit                  
Debt Instrument [Line Items]                  
Line of credit Facility, maximum borrowing capacity $ 700,000 $ 685,000              
Debt instrument, term 4 years 5 years              
Borrowings outstanding     $ 398,000            
Basis spread on variable rate     1.625%            
Line of credit facility, remaining borrowing capacity     $ 302,000            
Line of Credit | Interest Rate Swap                  
Debt Instrument [Line Items]                  
Revolving credit borrowings               $ 300,000 $ 120,000
Amount received from terminate agreement               $ 6,300  
Amount paid to terminate agreement                 $ 5,200
Derivative, fixed interest rate           3.735% 2.11%    
Derivative, notional amount           $ 350,000 $ 350,000    
LIBOR rate           0.16%      
Line of Credit | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate     1.50%            
Line of Credit | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate     2.00%