Employee Benefits - Asset Allocation Percentages (Details)	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentages	100.00%	100.00%
Pension Plans | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentages	3.40%	0.00%
Pension Plans | Fixed income investments
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentages	35.90%	37.30%
Pension Plans | Equity investments
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentages	18.90%	62.70%
Pension Plans | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentages	41.80%	0.00%