Stock-Based Incentive Plans - Options Value Assumptions (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Risk free interest rate	1.50%	1.60%	0.80%
Weighted average historical volatility	36.80%	51.10%	83.40%
Dividend yield	3.17%	3.68%	4.15%
Expected years until exercise	4 years 5 months 26 days	4 years 7 months 6 days	4 years 7 months 6 days
Weighted average fair value of options granted	$ 27.20	$ 26.87	$ 36.00