Income Taxes (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Analysis of effective income tax rate for continuing operations
Notional U.S. federal income tax expense at the statutory rate	$ (3,110)	$ 7,136	$ 11,605	$ 20,661
U.S. state and local income tax, net	48	78	89	125
Non-deductible expenses in the U.S.	55	150	(194)	285
Other	(9)	(15)	(17)	(24)
Provision for income taxes	495	2,385	2,341	6,324
Bermuda
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:			1,628	(10,662)
Ireland
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:			(254)	2,073
Other
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:			(2,927)	(2,083)
Singapore | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:	(4,662)	(2,716)	$ (7,589)	$ (4,051)
Other | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:	(1,487)	(872)
Ireland | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:	(796)	194
Bermuda | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:	$ 10,456	$ (1,570)