Income Taxes (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Analysis of effective income tax rate for continuing operations
Notional U.S. federal income tax expense at the statutory rate:	$ 44,885	$ 39,073	$ 13,630
U.S. state and local income tax, net	221	189	195
Non-deductible expenses in the U.S.	737	644	447
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	(165)	(468)	(87)
Income tax provision	12,771	13,863	9,215
Bermuda | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Non-U.S. operations	(20,789)	(12,424)	4,749
Ireland | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Non-U.S. operations	(3,073)	(4,732)	(5,514)
SINGAPORE | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Non-U.S. operations	(5,650)	(5,529)	(597)
Other low tax jurisdictions | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Non-U.S. operations	$ (3,395)	$ (2,890)	$ (3,608)