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Debt Debt, Textuals (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Debt Instrument [Line Items]          
Debt, Weighted Average Interest Rate 3.79%   3.79%   3.62%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 82.00%   82.00%   66.00%
Notes Payable to Bank, Noncurrent $ 585,000   $ 585,000   $ 601,250
Line of Credit Facility, Amount Outstanding 0   $ 0   525,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.10%    
Letters of Credit, Maximum Borrowing Capacity 34,000   $ 34,000    
Line of Credit Facility, Remaining Borrowing Capacity 966,000   966,000    
Principal payments on capital leases     16,091 $ 20,453  
Repayments of Other Debt     1,800 200  
Repayments of Debt     717,900 112,400  
Losses on early extinguishment of debt, net (5,226) $ (11) (5,226) (150)  
Long-term Debt, Fair Value 3,873,562   3,873,562   3,836,715
Redemption Premium     4,800 100  
Interest Paid, Including Capitalized Interest, Operating and Investing Activities     69,000 83,900  
Line of Credit Facility, Increase (Decrease), Net     20,000 190,000  
Unamortized Debt Issuance Expense 47,747   47,747   36,739
Debt Issuance Costs, Net 13,600   13,600    
November 2021 [Member]          
Debt Instrument [Line Items]          
Repayments of Debt     150,000    
April 2027 [Member]          
Debt Instrument [Line Items]          
Repayments of Debt       800  
January 2022 [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Amount Outstanding 0   0   525,000
May 2024 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Periodic Payment     16,300    
Bank Credit Facility 2024 [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Increase (Decrease), Net       190,000  
Debt Instrument, Periodic Payment     545,000 $ 95,000  
Unsecured Debt [Member] | November 2021 [Member]          
Debt Instrument [Line Items]          
Senior Notes 0   0   150,000
Unsecured Debt [Member] | April 2027 [Member]          
Debt Instrument [Line Items]          
Senior Notes 152,710   152,710   152,710
Unsecured Debt [Member] | December 2027 [Member]          
Debt Instrument [Line Items]          
Senior Notes 550,000   550,000   550,000
Unsecured Debt [Member] | August 2030          
Debt Instrument [Line Items]          
Senior Notes 850,000   850,000   850,000
Unsecured Debt [Member] | June 2029 [Member]          
Debt Instrument [Line Items]          
Senior Notes $ 750,000   $ 750,000   $ 750,000