Annual report pursuant to Section 13 and 15(d)

Long Term Debt (Schedule of Long Term Debt) (Details)

v2.4.0.6
Long Term Debt (Schedule of Long Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 879,794 $ 864,288
Debt Instrument, Unamortized Discount 2,743  
Long-term Debt, Current Maturities 1,928 3,241
Long Term Debt, net 875,123 858,031
Senior Credit Facility [Member]
   
Debt Instrument [Line Items]    
Long-term Debt 90,000 60,000
2019 Notes [Member]
   
Debt Instrument [Line Items]    
Long-term Debt 425,000 425,000
Debt Instrument, Unamortized Discount 2,743 3,016
2021 Notes [Member]
   
Debt Instrument [Line Items]    
Long-term Debt 325,000 325,000
CoBank Mortgage [Member]
   
Debt Instrument [Line Items]    
Long-term Debt 797 1,344
Rural Utility Service [Member]
   
Debt Instrument [Line Items]    
Long-term Debt $ 38,997 $ 52,944