Income Taxes - Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory federal income tax rate	(35.00%)	(35.00%)	35.00%
State and local income taxes, net of federal income tax benefit	(0.10%)	0.50%	43.40%
Tax credits	(5.10%)	(22.80%)	(45.20%)
Foreign taxes at less than the federal statutory rate (including tax holidays)	(10.70%)	(10.60%)	(322.90%)
Federal and foreign valuation allowance	52.50%	35.80%	1757.60%
Non-deductible extinguishment and debt finance costs	0.00%	0.00%	6.40%
Withholding taxes	0.60%	0.70%	65.20%
Compensation	0.10%	0.50%	6.80%
Dividends	12.30%	54.60%	(9.80%)
Life insurance	4.10%	(1.50%)	(60.20%)
Foreign branch activity	(1.80%)	(1.80%)	(78.00%)
Uncertain tax positions	1.20%	1.30%	826.60%
Other, net	(9.30%)	3.30%	(811.20%)
Effective Income Tax Rate, Continuing Operations	8.80%	25.00%	1413.70%