Income Taxes (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Statutory Rate [Line Items]
Participating Securities, Distributed and Undistributed Earnings of Net Income, Percent	0.86%	0.79%	0.82%	0.74%
Analysis of effective income tax rate for continuing operations
Notional U.S. federal income tax expense (benefit) at the statutory rate	$ 9,831	$ (4,493)	$ 30,492	$ 27,497
U.S. state and local income tax, net	14	57	139	167
Non-deductible expenses in the U.S.	133	205	418	566
Other	(2)	(11)	(26)	(32)
Income tax provision	2,458	2,709	8,782	12,037
Bermuda
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:			(16,687)	(9,199)
Ireland
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:			2,155	(407)
Other
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:			(2,835)	(2,439)
Singapore | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:	(823)	(1,385)	$ (4,874)	$ (4,116)
Other | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:	(752)	(860)
Ireland | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:	82	2,500
Bermuda | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Non-U.S. operations:	$ (6,025)	$ 6,696