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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Income Taxes [Abstract]      
Statutory tax rate   37.50%  
Deferred tax asset, net $ 176,700 $ 196,100  
Effective tax rate   14.20% 33.00%
Estimated annual effective tax rate   26.00%  
Effective tax rate, discrete tax windfall on stock awards   14.20%  
Preferential tax rates   33.00%  
Unrecognized tax benefits 2,700 $ 2,700  
Unrecognized tax benefits, income tax penalties and interest accrued $ 51 8  
Income tax expense   $ 297 $ 11,574
Surtax Percent Included In Maximum Tax Rate 10.00%