Income Taxes (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Analysis of effective income tax rate for continuing operations
Notional U.S. federal income tax expense at the statutory rate	$ 7,270	$ 10,806	$ 15,305	$ 22,339
U.S. state and local income tax, net	181	55	390	103
Non-deductible expenses in the U.S.	232	29	569	(164)
Income tax provision	5,992	3,132	9,090	2,288
Bermuda
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:			(8,048)	(14,395)
Ireland
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:			2,602	(1,128)
Other
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:			(1,724)	(1,643)
Singapore | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:	(2)	0	$ (4)	$ (2,824)
Other | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:	(872)	(835)
Ireland | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:	2,093	(811)
Bermuda | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:	$ (2,910)	$ (6,112)