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Notes Payable and Debt and Financing Arrangements - Financing Structure (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Debt instrument, face amount $ 2,675,000 $ 2,675,000
Notes payable and debt 2,647,677 2,644,970
Senior notes | 2.3% Senior Notes due 2018    
Debt Instrument [Line Items]    
Debt instrument, face amount [1] 300,000 300,000
Notes payable and debt [2] $ 298,686 298,015
Debt instrument interest rate, stated percentage 2.30%  
Senior notes | 5.75% Senior Notes due 2021    
Debt Instrument [Line Items]    
Debt instrument, face amount [1] $ 400,000 400,000
Notes payable and debt [2] $ 397,953 397,523
Debt instrument interest rate, stated percentage 5.75%  
Senior notes | 6.375% Senior Notes due 2024    
Debt Instrument [Line Items]    
Debt instrument, face amount [1] $ 350,000 350,000
Notes payable and debt [2] $ 349,139 349,029
Debt instrument interest rate, stated percentage 6.375%  
Senior notes | 6.25% Senior Notes due 2027    
Debt Instrument [Line Items]    
Debt instrument, face amount [1] $ 325,000 325,000
Notes payable and debt [2] $ 323,375 323,218
Debt instrument interest rate, stated percentage 6.25%  
Senior notes | 5.25% Senior Notes due 2043    
Debt Instrument [Line Items]    
Debt instrument, face amount [1] $ 300,000 300,000
Notes payable and debt [2] $ 296,427 296,294
Debt instrument interest rate, stated percentage 5.25%  
Subordinated debt | 4.45% Subordinated Notes due 2025    
Debt Instrument [Line Items]    
Debt instrument, face amount [1] $ 500,000 500,000
Notes payable and debt [2] $ 493,329 492,521
Debt instrument interest rate, stated percentage 4.45%  
Subordinated debt | 5.5% Subordinated Notes due 2045    
Debt Instrument [Line Items]    
Debt instrument, face amount [1] $ 500,000 500,000
Notes payable and debt [2] $ 488,768 488,370
Debt instrument interest rate, stated percentage 5.50%  
Revolving credit facility    
Debt Instrument [Line Items]    
Available letter of credit facilities - commitments $ 1,000,000 1,400,000
Available letter of credit facilities - in use 245,000 527,100
Line of credit facility, remaining borrowing capacity $ 755,000 $ 822,900
[1] Excluded from the table are certain credit facilities under which the Company is permitted to utilize up to $1.0 billion and $1.4 billion as of December 31, 2016 and December 31, 2015, respectively, for revolving loans to support general operating and financing needs. However, as of December 31, 2016 and December 31, 2015, $245 million and $527.1 million, respectively, were utilized under these facilities to issue letters of credit, leaving $755.0 million and $822.9 million, respectively, available to support other operating and financing need
[2] "In Use/Outstanding" data represent December 31, 2016 and December 31, 2015 accreted values.