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Income Taxes (Income Tax Rates) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Tax [Line Items]            
Consolidated effective tax rate 31.10% 32.90% 30.00% 31.90% 30.30% 32.00%
Federal statutory tax rate 35.00%   35.00%   35.00%  
Income Tax Rate Capital Gains     20.00%      
Tax Year 2015 | TEXAS            
Income Tax [Line Items]            
State Franchise Tax Rate     0.75%      
Tax Year 2014 | TEXAS            
Income Tax [Line Items]            
State Franchise Tax Rate     0.95%