Employee Benefit Plans - Plan Asset Allocations (Details) (Pension Benefits)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Target allocations (in percent)	100.00%
Weighted-average asset allocations (in percent)	100.00%	100.00%
Domestic equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocations (in percent)	28.00%
Weighted-average asset allocations (in percent)	50.00%	29.00%
International equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocations (in percent)	15.00%
Weighted-average asset allocations (in percent)	14.00%	16.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target allocations (in percent)	46.00%
Weighted-average asset allocations (in percent)	18.00%	44.00%
Real estate
Defined Benefit Plan Disclosure [Line Items]
Target allocations (in percent)	7.00%
Weighted-average asset allocations (in percent)	5.00%	5.00%
Other and cash
Defined Benefit Plan Disclosure [Line Items]
Target allocations (in percent)	4.00%
Weighted-average asset allocations (in percent)	13.00%	6.00%