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Short-Term Notes Payable (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Short-term Debt [Line Items]    
Credit facility, face amount $ 400,000  
Revolving Credit Facility [Member]    
Short-term Debt [Line Items]    
Credit facility, face amount 2,000,000  
Line of Credit Facility, Maximum Borrowing Capacity 750,000  
Additional Capacity Available On Credit Lines At Request $ 500,000  
Minimum interest coverage ratio 2.50  
Interest coverage ratio 3.94  
Current Ratio 2.41  
Senior secured leverage ratio, maximum 1.00  
Current secured leverage ratio 2.75  
Letters of credit outstanding $ 333,322 $ 325,676
Borrowings and issuance of letters of credit remaining capacity $ 1,666,678 $ 1,674,324