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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Tax Contingency [Line Items]          
Income tax expense (benefit) for income from continuing operations $ 11,308 $ 13,531 $ 20,778 $ 25,598  
Unrecognized tax benefit 21,700   21,700    
Net tax benefit from unrecognized tax benefits, if recognized 10,000   10,000    
Cash and cash equivalents 181,657   $ 181,657   $ 212,139
Costa Rica | Tax holiday through December 31, 2018          
Income Tax Contingency [Line Items]          
Holiday tax rate     100.00%    
Costa Rica | Tax holiday for the subsequent 4 years          
Income Tax Contingency [Line Items]          
Holiday tax rate     50.00%    
Income tax holiday, term     4 years    
International          
Income Tax Contingency [Line Items]          
Cash and cash equivalents $ 150,600   $ 150,600