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Business Segment and Geographical Information - Distribution of Income from Operations, Excluding Restructuring, by Geographical Area (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Income from operations, excluding restructuring and other items $ 385,847 $ 346,091 $ 319,853
Ireland      
Segment Reporting Information [Line Items]      
Income from operations, excluding restructuring and other items 269,196 240,115 218,334
Rest of Europe      
Segment Reporting Information [Line Items]      
Income from operations, excluding restructuring and other items 36,904 26,351 36,509
U.S.      
Segment Reporting Information [Line Items]      
Income from operations, excluding restructuring and other items 58,340 58,164 44,590
Other      
Segment Reporting Information [Line Items]      
Income from operations, excluding restructuring and other items $ 21,407 $ 21,461 $ 20,420