Segment Reporting and Foreign Operations - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 382,728	$ 378,785	$ 331,452
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	277,643	273,816	231,864
Ireland
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	42,951	44,912	45,283
Other foreign countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 62,134	$ 60,057	$ 54,305