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Contingencies and Legal Proceedings Contingencies (Details) - Jun. 30, 2015
$ in Thousands
USD ($)
Units
reactors
Insurance_layers
Procedures
Sites
Loss Contingencies [Line Items]  
Nuclear liability insurance $ 375,000
Number of sites | Sites 1
Assessment from licensees for each licensed reactor $ 127,000
Number of licensed reactors in US | reactors 102
Nuclear accident assessment limitation per year per unit $ 19,000
Number of licensed nuclear units | Units 6
Maximum assessment per nuclear incident $ 764,000
Maximum payment required per incident in any one year 114,000
Total amount of protection available $ 13,000,000
Surcharge for legal expenses 5.00%
Number of layers before Congress is required to take action | Insurance_layers 2
Amount of property, decommissioning, and decontamination insurance carried $ 5,100,000
Amount of insurance available for loss at any one site 2,100,000
Maximum amount of retrospecitve premiums 127,000
Maximum indemnity if a covered accident takes or keeps a nuclear unit offline 490,000
Maximum retrospective premiums $ 36,000
Number of procedures for determining estimates for the costs of nuclear decommissioning | Procedures 2
Possible additional future costs for compliance with Clean Air Act requirements $ 800,000
Amount of settlement for potential liability related to soil cleanup 300
Amount of settlement for potential liability related to EPA study of site 8
Remaining cleanup, remediation, and natural resource damages are less than 1,000
Accrual for Environmental Loss Contingencies, Gross 9,000
Nuclear  
Loss Contingencies [Line Items]  
Present value of estimated future decommissioning cost 2,100,000
Non-nuclear  
Loss Contingencies [Line Items]  
Present value of estimated future decommissioning cost $ 1,700,000