Segment and Other Information - Total Long-Lived Assets by Location (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 119,913	$ 107,490
Ireland
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	64,862	62,453
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	45,943	35,791
Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	7,107	7,000
All other
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 2,001	$ 2,246