Postretirement Benefit Plans (Details 9)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]
Expected long-term return on plan assets	7.40%	7.42%	7.52%
Actual rate of return on plan assets	10.17%	10.09%	(1.40%)