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Debt Narratives (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Debt Instrument [Line Items]            
Debt, Weighted Average Interest Rate 5.21%     5.21%   5.21%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 75.00%     75.00%   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 $ 31,600     31,600    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.35%          
Line of Credit Facility, Remaining Borrowing Capacity $ 203,400     203,400    
Line of Credit Facility, Increase (Decrease), Net   $ 95,000 $ 110,000 30,000    
Repayments of Long-term Capital Lease Obligations       15,257 $ 14,491  
Repayments of Debt       30,000    
Repayments of Long-term Debt       30,121 135,371  
Gains (Losses) on Extinguishment of Debt 0 $ (29,158)   0 (29,158)  
Capital Lease Obligations Incurred       22,500 19,000  
Unsecured Debt            
Debt Instrument [Line Items]            
Repayments of Long-term Debt         300  
Repayments of Other Debt         $ 898,200  
Unsecured Debt | May 2024            
Debt Instrument [Line Items]            
Senior Notes $ 550,000     550,000   $ 550,000
Unsecured Debt | May 2019            
Debt Instrument [Line Items]            
Repayments of Debt       250,000    
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       135,000    
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