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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Tax Credit Carryforward [Line Items]          
Income tax expense (benefit) $ (2,551) $ 1,775   $ (2,765) $ 3,355
AMT Tax Credit Carryforward          
Tax Credit Carryforward [Line Items]          
Tax credit $ 3,700     $ 3,700  
Minimum          
Tax Credit Carryforward [Line Items]          
Global intangible low-tax income dividend     $ 3,100    
Maximum          
Tax Credit Carryforward [Line Items]          
Global intangible low-tax income dividend     $ 2,100