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Long-Term Debt and Financing Obligations Long-term Debt Maturities (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]  
Long-term Debt, Maturities, Repayments of Principal in Year One $ 0
Long-term Debt, Maturities, Repayments of Principal in Year Two 83,300
Long-term Debt, Maturities, Repayments of Principal in Year Three 0
Long-term Debt, Maturities, Repayments of Principal in Year Four 0
Long-term Debt, Maturities, Repayments of Principal in Year Five 45,000
Nuclear Fuel Financing | Revolving Credit Facility  
Debt Instrument [Line Items]  
Long-term Debt, Maturities, Repayments of Principal in Year One $ 33,700