Geographic Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Total revenues by geographic area
Revenues	$ 796,213	$ 723,053	$ 664,505
United States
Total revenues by geographic area
Revenues	537,310	509,105	432,900
Australia
Total revenues by geographic area
Revenues	23	86	87
Ireland
Total revenues by geographic area
Revenues	166,739	141,793	129,662
Singapore
Total revenues by geographic area
Revenues	91,816	$ 72,069	98,917
China
Total revenues by geographic area
Revenues	$ 325
United Kingdom
Total revenues by geographic area
Revenues			$ 2,939