INCOME TAXES (DETAILS 5) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of effective tax rate (% of income before income taxes) [Line Items]
Unrecognized tax benefits	$ 0	$ 0
Income before income taxes - Bermuda (domestic)	469,306,000	652,235,000	$ 690,517,000
Income before income taxes - foreign	50,402,000	(7,576,000)	139,955,000
Total income before income taxes	$ 519,708,000	$ 644,659,000	$ 830,472,000
Expected tax rate	0.00%	0.00%	0.00%
Valuation allowance	0.20%	1.20%	1.10%
Net tax exempt income	(0.20%)	(0.10%)	(0.70%)
Other	0.30%	(0.90%)	(0.60%)
Actual tax rate	1.20%	0.50%	3.10%
U.S. [Member]
Reconciliation of effective tax rate (% of income before income taxes) [Line Items]
Foreign taxes at local expected rates	(0.60%)	0.80%	1.80%
Europe [Member]
Reconciliation of effective tax rate (% of income before income taxes) [Line Items]
Foreign taxes at local expected rates	1.50%	(0.20%)	1.50%
Other [Member]
Reconciliation of effective tax rate (% of income before income taxes) [Line Items]
Foreign taxes at local expected rates	0.00%	(0.30%)	0.00%