Employee Benefit Plans (Details 8)					12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended
	Dec. 31, 2013 Pension Benefit Plan	Dec. 31, 2012 Pension Benefit Plan	Dec. 31, 2013 Other Benefits Plan	Dec. 31, 2012 Other Benefits Plan	Dec. 31, 2013 Equity Securities	Dec. 31, 2013 Equity Securities Pension Benefit Plan	Dec. 31, 2012 Equity Securities Pension Benefit Plan	Dec. 31, 2013 Equity Securities Other Benefits Plan	Dec. 31, 2012 Equity Securities Other Benefits Plan	Dec. 31, 2013 Debt Securities	Dec. 31, 2013 Debt Securities Pension Benefit Plan	Dec. 31, 2012 Debt Securities Pension Benefit Plan	Dec. 31, 2013 Debt Securities Other Benefits Plan	Dec. 31, 2012 Debt Securities Other Benefits Plan	Dec. 31, 2013 Cash	Dec. 31, 2013 Cash Pension Benefit Plan	Dec. 31, 2012 Cash Pension Benefit Plan	Dec. 31, 2013 Cash Other Benefits Plan	Dec. 31, 2012 Cash Other Benefits Plan	Dec. 31, 2013 Commodities	Dec. 31, 2013 Commodities Pension Benefit Plan	Dec. 31, 2012 Commodities Pension Benefit Plan	Dec. 31, 2013 Commodities Other Benefits Plan	Dec. 31, 2012 Commodities Other Benefits Plan
Allocation of plan assets	100.00%	100.00%	100.00%	100.00%		65.40%	60.90%	47.80%	40.30%		32.10%	32.90%	47.90%	53.00%		0.80%	6.00%	3.60%	5.90%		1.70%	0.20%	0.70%	0.80%
Target plan allocations					60.00%					38.00%					2.00%					0.00%
Target plan allocations, minimum					30.00%					25.00%					0.00%					0.00%
Target plan allocations, maximum					70.00%					70.00%					10.00%					5.00%