Long Term Debt (Schedule of Long Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Debt Instrument [Line Items] | |||||||||||||
Long-term debt, gross | $ 1,050,425 | $ 879,794 | |||||||||||
Less unamortized discount paid on the 2019 Notes | 2,445 | ||||||||||||
Less current portion of long-term debt | 2,836 | 1,928 | |||||||||||
Long-term debt, net | 1,045,144 | 875,123 | |||||||||||
2021 Notes [Member] | Line of Credit [Member]
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Debt Instrument [Line Items] | |||||||||||||
Long-term debt, gross | 325,000 | [1] | 325,000 | [1] | |||||||||
Less unamortized discount paid on the 2019 Notes | 1,500 | ||||||||||||
2019 Notes [Member]
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Debt Instrument [Line Items] | |||||||||||||
Less unamortized discount paid on the 2019 Notes | 2,445 | 2,743 | |||||||||||
2019 Notes [Member] | Line of Credit [Member]
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Debt Instrument [Line Items] | |||||||||||||
Long-term debt, gross | 425,000 | [2] | 425,000 | [2] | |||||||||
Senior Credit Facility [Member] | Notes Payable to Banks [Member]
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Debt Instrument [Line Items] | |||||||||||||
Long-term debt, gross | 261,000 | [3] | 90,000 | [3] | |||||||||
Rural Utilities Service (RUS) debt [Member] | Notes Payable to Banks [Member]
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Debt Instrument [Line Items] | |||||||||||||
Long-term debt, gross | 39,425 | [4] | 38,997 | [4] | |||||||||
CoBank Mortgage note payable [Member] | Mortgages [Member]
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Debt Instrument [Line Items] | |||||||||||||
Long-term debt, gross | $ 0 | $ 797 | |||||||||||
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