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Debt Debt, Textuals (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Debt Instrument [Line Items]      
Debt, Weighted Average Interest Rate 3.66%   3.62%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 68.00%   66.00%
Notes Payable to Bank, Noncurrent $ 593,125   $ 601,250
Line of Credit Facility, Amount Outstanding $ 445,000   525,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.15%    
Letters of Credit, Maximum Borrowing Capacity $ 34,000    
Line of Credit Facility, Remaining Borrowing Capacity 521,000    
Principal payments on capital leases 6,652 $ 10,254  
Repayments of Other Debt 900 100  
Repayments of Debt 109,000 34,000  
Losses on early extinguishment of debt, net 0 (139)  
Long-term Debt, Fair Value 3,647,825   3,836,715
Redemption Premium   100  
Interest Paid, Including Capitalized Interest, Operating and Investing Activities 20,100 10,100  
Line of Credit Facility, Increase (Decrease), Net 20,000 75,000  
April 2027 [Member]      
Debt Instrument [Line Items]      
Repayments of Debt   700  
January 2022 [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Amount Outstanding 445,000   525,000
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 100,000 $ 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 152,710   152,710
Unsecured Debt [Member] | December 2027 [Member]      
Debt Instrument [Line Items]      
Senior Notes 550,000   550,000
Unsecured Debt [Member] | August 2030      
Debt Instrument [Line Items]      
Senior Notes 850,000   850,000
Unsecured Debt [Member] | June 2029 [Member]      
Debt Instrument [Line Items]      
Senior Notes $ 750,000   $ 750,000