Geographic Information and Business Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Total revenues by geographic area
Revenues	$ 1,027,982	$ 702,272	$ 796,213
United States
Total revenues by geographic area
Revenues	791,044	455,418	537,310
Ireland
Total revenues by geographic area
Revenues	97,637	139,642	166,739
United Kingdom
Total revenues by geographic area
Revenues	21,143
Singapore
Total revenues by geographic area
Revenues	113,891	106,813	91,816
Sweden
Total revenues by geographic area
Revenues	3,986
Others
Total revenues by geographic area
Revenues	281	$ 399	348
VFH
Total revenues by geographic area
Revenues	$ 86,599		$ 445