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Income Taxes - Components of Income Before Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items]      
Income before provision for income taxes $ 364,614 $ 328,057 $ 300,172
Ireland      
Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items]      
Income before provision for income taxes 243,988 218,306 201,221
United States      
Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items]      
Income before provision for income taxes 27,499 28,426 11,466
Other      
Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items]      
Income before provision for income taxes $ 93,127 $ 81,325 $ 87,485