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Debt and Credit Agreements (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Debt    
Long-term debt $ 1,612,000 $ 1,147,000
7.33% weighted-average fixed rate notes
   
Debt    
Long-term debt 20,000 20,000
6.51% weighted-average fixed rate notes
   
Debt    
Long-term debt 425,000 425,000
9.78% notes
   
Debt    
Long-term debt 67,000 67,000
5.58% weighted-average fixed rate notes
   
Debt    
Long-term debt 175,000 175,000
3.65% weighted-average fixed rate notes
   
Debt    
Long-term debt 925,000 0
Revolving credit facility
   
Debt    
Long-term debt $ 0 $ 460,000