Segment Reporting and Foreign Operations - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 378,785	$ 331,452	$ 292,820
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	273,816	231,864	202,504
Ireland
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	44,912	45,283	45,671
Other foreign countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 60,057	$ 54,305	$ 44,645