Employee Benefit Plans - Assumptions Used to Determine Net Periodic Benefit Cost (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Pension Plan [Member]
Assumptions used to determine net periodic benefit cost [Abstract]
Discount rate (in hundredths)	4.17%	4.70%	5.51%
Rate of compensation increase (in hundredths)	3.00%	4.00%	4.00%
Long-term rate of return on plan assets (in hundredths)	7.50%	7.50%	8.00%
Supplementary Pension Plan [Member]
Assumptions used to determine net periodic benefit cost [Abstract]
Discount rate (in hundredths)	4.00%	4.63%	5.36%
Rate of compensation increase (in hundredths)	3.00%	4.00%	4.00%