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Income Taxes - Foreign Tax Credit Carryforwards (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Deferred tax assets, operating loss, and other carryforwards      
Deferred tax assets, foreign and state NOL     $ 20,864
Net operating loss (NOL) carryforwards     120,457
Deferred tax assets, valuation allowance     12,805
Income taxes paid $ 3,138 $ 6,931  
Foreign tax credit carryforwards      
Deferred tax assets, operating loss, and other carryforwards      
Other deductible carryforwards     $ 31,161