Segment Reporting and Foreign Operations - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 267,778	$ 244,171	$ 243,270
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	186,389	177,627	178,130
Ireland
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	48,896	49,708	50,274
Other Foreign Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 32,493	$ 16,836	$ 14,866