Pension and Other Post-Retirement Benefit Plans (Details 3)					12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Domestic broadly diversified equity securities	Dec. 31, 2012 Domestic broadly diversified equity securities	Dec. 31, 2013 Domestic broadly diversified equity securities Minimum	Dec. 31, 2013 Domestic broadly diversified equity securities Maximum	Dec. 31, 2013 Fixed income securities	Dec. 31, 2012 Fixed income securities	Dec. 31, 2013 Fixed income securities Minimum	Dec. 31, 2013 Fixed income securities Maximum	Dec. 31, 2013 International broadly diversified equity securities	Dec. 31, 2012 International broadly diversified equity securities	Dec. 31, 2013 International broadly diversified equity securities Minimum	Dec. 31, 2013 International broadly diversified equity securities Maximum	Dec. 31, 2013 Alternative fixed income securities	Dec. 31, 2012 Alternative fixed income securities	Dec. 31, 2013 Alternative fixed income securities Minimum	Dec. 31, 2013 Alternative fixed income securities Maximum	Dec. 31, 2013 Cash and equivalent investments	Dec. 31, 2012 Cash and equivalent investments	Dec. 31, 2013 Cash and equivalent investments Minimum	Dec. 31, 2013 Cash and equivalent investments Maximum
Pension asset allocation and target allocation for 2014 by asset category
Target allocation 2014 (as a percent)					40.00%	60.00%			20.00%	50.00%			5.00%	15.00%			0.00%	10.00%			0.00%	15.00%
Plan assets (as a percent)	100.00%	100.00%	42.00%	53.00%			29.00%	32.00%			7.00%	10.00%			4.00%	4.00%			18.00%	1.00%