Income Taxes (Narrative) (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Taxes [Line Items]        
Effective income tax rates 0.00% 36.70% 9.00% 37.20%
Corporate Income Tax Rate     35.00% 35.00%