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Long-Term Debt and Financing Obligations Long-term Debt Maturities (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]  
Long-term Debt, Maturities, Repayments of Principal in Year One $ 83,300
Long-term Debt, Maturities, Repayments of Principal in Year Two 0
Long-term Debt, Maturities, Repayments of Principal in Year Three 0
Long-term Debt, Maturities, Repayments of Principal in Year Four 45,000
Long-term Debt, Maturities, Repayments of Principal in Year Five 0
Nuclear Fuel Financing | Revolving Credit Facility  
Debt Instrument [Line Items]  
Long-term Debt, Maturities, Repayments of Principal in Year One $ 37,600