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Income Taxes (Details)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]    
Federal statutory income tax rate 35.00% 35.00%
Income tax credits (14.00%) (11.00%)
State income tax, net of federal income tax benefit (4.00%) 2.00%
Income tax effect of foreign income (5.00%) (4.00%)
Equity income 2.00% 2.00%
Other, net (0.00%) (2.00%)
Effective income tax rate 14.00% 22.00%
Production Tax Credit Carryforwards [Abstract]    
Years eligible for federal renewable energy production tax credit 10 years