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Income Taxes - Foreign Tax Credit Carryforwards (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 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 $ 3,810  
Foreign tax credit carryforwards    
Deferred tax assets, operating loss, and other carryforwards    
Other deductible carryforwards   $ 31,161