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Debt Narratives (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Mar. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Debt Instrument [Line Items]            
Debt, Weighted Average Interest Rate 5.15%     5.15%   5.21%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 76.00%     76.00%   75.00%
Line of Credit Facility, Maximum Borrowing Capacity $ 500,000     $ 500,000    
Letters of Credit, Maximum Borrowing Capacity 175,000     175,000    
Letters of Credit Outstanding, Amount $ 33,300     33,300    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.35%          
Line of Credit Facility, Remaining Borrowing Capacity $ 241,700     241,700    
Line of Credit Facility, Increase (Decrease), Net   $ 95,000 $ 110,000 90,000    
Repayments of Long-term Debt       145,171 $ 222,958  
Gains (Losses) on Extinguishment of Debt (6,918) $ 0   (6,918) (29,158)  
Capital Lease Obligations Incurred       51,300 30,800  
Repayments of Long-term Capital Lease Obligations       20,421 21,979  
Unsecured Debt            
Debt Instrument [Line Items]            
Repayments of Other Debt       342,500 985,800  
Unsecured Debt | May 2019            
Debt Instrument [Line Items]            
Repayments of Debt         250,000  
Unsecured Debt | May 2024            
Debt Instrument [Line Items]            
Senior Notes 850,000     850,000   $ 550,000
Additional Issuance of Unsecured Debt       300,000    
Debt Instrument, Unamortized Premium 11,300     11,300    
Unsecured Debt | April 2019            
Debt Instrument [Line Items]            
Repayments of Debt         200,000  
Repayments of Long-term Debt         9,100  
Unsecured Debt | April 2015            
Debt Instrument [Line Items]            
Repayments of Debt         136,500  
Unsecured Debt | July 2018            
Debt Instrument [Line Items]            
Repayments of Debt       45,000 222,500  
Unsecured Debt | July 2014            
Debt Instrument [Line Items]            
Repayments of Debt         86,400  
Repayments of Long-term Debt         21,700  
Unsecured Debt | July 2016            
Debt Instrument [Line Items]            
Repayments of Debt         45,000  
Repayments of Long-term Debt         $ 14,200  
Unsecured Debt | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Repayments of Debt       100,000    
Unsecured Debt | April 2016            
Debt Instrument [Line Items]            
Senior Notes $ 0     0   $ 197,377
Repayments of Debt       $ 197,400