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Senior Long-Term Debt and Other Debt Senior Long-Term Debt and Other Debt (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]            
Debt instrument, fair value disclosure $ 4,257,000,000   $ 4,257,000,000     $ 3,030,000,000
Line of credit facility, expiration date Apr. 10, 2024          
Loss on early extinguishment of debt $ 6,705,000 $ 0 6,705,000 $ 0    
Revolving credit facility [Member]            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity 300,000,000   300,000,000   $ 300,000,000  
Line of credit facility borrowing capacity increase     200,000,000      
Long-term line of credit 0   0     $ 0
Secured letters of credit [Member]            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity $ 200,000,000   $ 200,000,000