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Income Taxes (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Income Taxes [Line Items]      
Due to related party $ 12,500,000   $ 10,600,000
Unrecognized tax benefits 44,100,000    
Unrecognized tax benefits which, if recognized, would impact the company's effective tax rate 28,700,000    
Unrecognized tax benefits netted with deferred tax asset carryforwards 25,700,000    
Accrued interest $ 8,700,000    
Effective tax rate 27.90% 41.40%  
Federal and state combined statutory tax rate 39.30% 39.50%  
AEPC      
Income Taxes [Line Items]      
Due to related party $ 12,500,000    
Income tax payments to AEPC $ 0 $ 0