XML 58 R47.htm IDEA: XBRL DOCUMENT v3.4.0.3
Income Taxes (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Income Taxes [Line Items]      
Due from related party $ 11,600,000   $ 11,600,000
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 related to state tax credits 25,900,000    
Accrued interest $ 6,000,000    
Effective tax rate (as a percent) 41.40% 22.10%  
Effective tax rate at a combined federal and state income tax rate (as a percent) 39.50% 39.60%  
AEPC      
Income Taxes [Line Items]      
Due from related party $ 11,600,000    
Income tax payments to AEPC $ 0 $ 0