Income Taxes (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Statutory Rate [Line Items]
Deferred Income Tax Expense (Benefit)	$ 20,223	$ (496)	$ (8,948)
Analysis of effective income tax rate for continuing operations
U.S. state and local income tax, net	36,779	54,946	51,207
Non-deductible expenses in the U.S.	3,581	157	(236)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	339	123	188
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	1,549	525	168
Bermuda | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	(16,950)	(41,064)	(21,517)
Ireland | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	(99)	(2,567)	(2,348)
SINGAPORE | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	(28)	(3,232)	(15,839)
Other low tax jurisdictions | Foreign Tax Authority
Analysis of effective income tax rate for continuing operations
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	$ (2,504)	$ (3,246)	$ (5,581)