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Debt Debt, Textuals (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Apr. 28, 2020
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Debt Instrument [Line Items]        
Debt, Weighted Average Interest Rate   4.64%   4.72%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   69.00%    
Notes Payable to Bank, Noncurrent   $ 625,625   $ 633,750
Line of Credit Facility, Amount Outstanding   $ 345,000   295,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.20%    
Letters of Credit, Maximum Borrowing Capacity   $ 34,000    
Line of Credit Facility, Remaining Borrowing Capacity   621,000    
Principal payments on capital leases   10,254 $ 10,657  
Repayments of Other Debt   100 100  
Repayments of Debt   34,000 143,500  
Losses on early extinguishment of debt, net   (139) 0  
Long-term Debt, Fair Value   3,569,916   3,583,241
Debt Instrument, Increase (Decrease), Net   75,000 15,000  
Redemption Premium   100    
Interest Paid, Including Capitalized Interest, Operating and Investing Activities   10,100 24,900  
Subsequent Event [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Amount Outstanding $ 390,000      
Line of Credit Facility, Increase (Decrease), Net $ 45,000      
April 2027 [Member]        
Debt Instrument [Line Items]        
Repayments of Debt   700    
Bank Credit Facility due March 2022 [Member]        
Debt Instrument [Line Items]        
Repayments of Debt     135,000  
Term Loan December 2022 [Member]        
Debt Instrument [Line Items]        
Repayments of Debt     $ 8,400  
January 2022 [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Amount Outstanding   345,000   295,000
May 2024 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Periodic Payment   8,100    
Bank Credit Facility 2024 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Periodic Payment   25,000    
Unsecured Debt [Member] | November 2021 [Member]        
Debt Instrument [Line Items]        
Senior Notes   150,000   150,000
Unsecured Debt [Member] | April 2027 [Member]        
Debt Instrument [Line Items]        
Senior Notes   152,805   153,465
Unsecured Debt [Member] | December 2027 [Member]        
Debt Instrument [Line Items]        
Senior Notes   550,000   550,000
Unsecured Debt [Member] | May 2024 [Member]        
Debt Instrument [Line Items]        
Senior Notes   $ 850,000   $ 850,000