Income Taxes (Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Tax provision at U.S. statutory rate	35.00%	35.00%	35.00%
State income taxes	0.80%	1.00%	1.00%
Settlements of tax examinations	(6.40%)	0.50%	0.40%
Valuation allowance	18.50%	8.60%	22.90%
Tax exempt interest	(14.30%)	(13.10%)	(26.30%)
Foreign tax rate differential	(7.90%)	(7.20%)	(4.20%)
Repatriation of foreign earnings, net of foreign tax credits	5.90%	0.20%
Repatriation of foreign earnings, net of foreign tax credits			(1.70%)
Tax incentives	(8.90%)	(7.80%)	(6.20%)
Other – net	0.80%	(1.60%)	(1.10%)
Effective income tax rate	23.50%	15.60%	19.80%