Segment Reporting and Foreign Operations - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 276,573	$ 267,778	$ 244,171
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	194,715	186,389	177,627
Ireland
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	47,337	48,896	49,708
Other Foreign Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 34,521	$ 32,493	$ 16,836