Incentive Compensation Plans Employee Stock Purchase Plans (Details)	12 Months Ended
	Dec. 31, 2015 shares
Prior Employee stock purchase plan
Stock Issued During Period, Shares, Employee Stock Purchase Plans	3,000,000
2016 Employee stock purchase plan
Maximum Employee Subscription Rate	10.00%
Maximum Number of Shares Per Employee	900
Employee Stock Purchase Plan description	90% of the lesser of the average market price of a share on the first business day of the offering period or the average market price of a share on the last business day of the offering period of three months
Employee Stock Ownership Plan (ESOP), Shares Contributed to ESOP	10,000,000