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Debt Debt, Textuals (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Debt Instrument [Line Items]          
Debt, Weighted Average Interest Rate   4.99% 4.73%    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   66.00% 75.00%    
Line of Credit Facility, Amount Outstanding   $ 395,000 $ 0    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.25%      
Letters of Credit, Maximum Borrowing Capacity   $ 32,900 33,300    
Line of Credit Facility, Remaining Borrowing Capacity   572,100      
Principal payments on capital leases   39,686 51,106 $ 33,119  
Repayments of Other Debt   300 200    
Repayments of Debt   300,000 1,600,000    
Losses on early extinguishment of debt, net   10,131 274 22,503  
Capital Lease Obligations Incurred   58,664 54,087 41,609  
Pledged Assets Separately Reported, Finance Receivables Pledged as Collateral, at Fair Value   3,800 3,700    
Pledged Assets, Other, Not Separately Reported on Statement of Financial Position   1,100 1,200    
Long-term Debt, Fair Value   3,391,926 3,440,052    
Bank Credit Agreement   562,500      
Term Loan, Maximum Borrowing Capacity   675,000      
Debt Issuance Costs, Line of Credit Arrangements, Net   12,900      
Repayments of Long-term Debt   34,134 468,973 $ 36,414  
October 2018 [Member]          
Debt Instrument [Line Items]          
Repayments of Debt $ 250,000        
Bank Credit Agreement $ 175,000        
Repayments of Long-term Debt   9,600      
March 2021 [Member]          
Debt Instrument [Line Items]          
Repayments of Debt   647,500      
Debt Instrument, Periodic Payment   26,300      
Bank Credit Facility due March 2021 [Domain]          
Debt Instrument [Line Items]          
Repayments of Debt   470,000      
Bank Credit Facility due March 2022 [Member]          
Debt Instrument [Line Items]          
Repayments of Debt   442,500      
Bank Credit Agreement         $ 25,000
Unsecured Debt [Member] | October 2018 [Member]          
Debt Instrument [Line Items]          
Senior Notes   0 250,000    
Unsecured Debt [Member] | May 2019 [Member]          
Debt Instrument [Line Items]          
Senior Notes   200,000 200,000    
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   200,000 200,000    
Unsecured Debt [Member] | December 2027 [Member]          
Debt Instrument [Line Items]          
Senior Notes   $ 550,000 $ 550,000