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Income Taxes (Details 1)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Effective tax rate reconciliation
Combined tax at U.S. statutory federal income tax rate	35.00%	35.00%	35.00%
Increase (decrease) in taxes resulting from:
Tax-exempt income	(1.70%)	(1.70%)	(1.50%)
State and local income taxes, net of federal benefit	2.70%	2.80%	2.70%
Non-U.S. subsidiaries earnings	(2.00%)	(1.80%)	(2.20%)
Tax settlements	(0.60%)	(0.20%)	(0.50%)
Non deductible expenses	0.00%	0.90%	0.00%
All other	(0.20%)	0.00%	1.00%
Actual tax rates	33.20%	35.00%	34.50%

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