Employee Benefit Plans (Details 7)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Benefits
Used to Determine Benefit Obligations at Measurement Date
Discount rate	[1]		0.65%	4.70%
Used to Determine Net Periodic Benefit Cost for Years ended December 31
Discount rate	[2]	0.65%	4.70%	3.80%
Expected long-term return on plan assets			7.00%	7.25%
Postretirement Benefits
Used to Determine Benefit Obligations at Measurement Date
Discount rate	[1]	4.20%	3.90%	4.80%
Used to Determine Net Periodic Benefit Cost for Years ended December 31
Discount rate	[2]	3.90%	4.80%	3.90%
Expected long-term return on plan assets		0.00%	0.00%	0.00%
Rate of compensation increases		0.00%	0.00%	0.00%

[1] In 2014 and 2013, the calculated discount rate for the unfunded pension plan was different than the defined benefit pension plan. The calculated rate for the unfunded employee retirement plan was 2.60%, 2.40% and 2.90% in 2015, 2014 and 2013, respectively.

[2] In 2015, 2014 and 2013, the calculated discount rate for the unfunded pension plan was different than the defined benefit pension plan. The calculated rate for the unfunded employee retirement plan was 2.40%, 2.90% and 2.10% in 2015, 2014 and 2013, respectively.