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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Tax Disclosure [Abstract]    
Income tax benefit $ 7,568 $ 31,565
Effective tax rate 4.60% 18.30%
Share-based compensation cost, percent 23.40%  
Preferred securities, percent 11.00%  
Prior year taxes, percent 16.10%