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Summary of Significant Accounting Policies - Effective Income Tax Rates (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accounting Policies [Abstract]        
Effective Tax Rate 10.30% 22.00% 14.70% 16.50%
Federal statutory tax rate     21.00% 21.00%
Discrete tax benefit       $ 14,000