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Consolidated Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated provision for uncollectible accounts - customers      
Consolidated Valuation and Qualifying Accounts      
Beginning Balance $ 59,266 $ 51,630 $ 40,354
Charged to Income 114,249 90,144 68,733
Charged to Other Accounts 54,199 36,373 39,775
Deductions 158,939 118,881 97,232
Ending Balance 68,775 59,266 51,630
Accumulated provision for uncollectible accounts - customers | FES      
Consolidated Valuation and Qualifying Accounts      
Beginning Balance 17,862 11,073 16,188
Charged to Income 7,411 21,942 14,294
Charged to Other Accounts 0 0 0
Deductions 16,807 15,153 19,409
Ending Balance 8,466 17,862 11,073
Accumulated provision for uncollectible accounts - other      
Consolidated Valuation and Qualifying Accounts      
Beginning Balance 5,197 2,976 4,013
Charged to Income 899 3,469 (1,464)
Charged to Other Accounts 4,189 8,264 5,208
Deductions 5,054 9,512 4,781
Ending Balance 5,231 5,197 2,976
Accumulated provision for uncollectible accounts - other | FES      
Consolidated Valuation and Qualifying Accounts      
Beginning Balance 2,500 2,523 2,500
Charged to Income 0 9 28
Charged to Other Accounts 0 0 0
Deductions 0 32 5
Ending Balance 2,500 2,500 2,523
Loss carryforward tax valuation reserve      
Consolidated Valuation and Qualifying Accounts      
Beginning Balance 174,004 125,360 101,697
Charged to Income 18,393 48,644 23,663
Charged to Other Accounts 0 0 0
Deductions 0 0 0
Ending Balance 192,397 174,004 125,360
Loss carryforward tax valuation reserve | FES      
Consolidated Valuation and Qualifying Accounts      
Beginning Balance 32,126 26,875 15,810
Charged to Income 13,682 5,251 11,065
Charged to Other Accounts 0 0 0
Deductions 0 0 0
Ending Balance $ 45,808 $ 32,126 $ 26,875