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Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Debt	$ 230,717	$ 232,177
Current maturities	517	1,977
Total long-term debt	230,200	230,200
CoBank (fixed term loan) [Member]
Debt Instrument [Line Items]
Debt	478	1,876
Term Loan A [Member]
Debt Instrument [Line Items]
Debt	230,000	230,000
Other Debt [Member]
Debt Instrument [Line Items]
Debt	$ 239	$ 301

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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