Pension Plan and Postretirement Benefits Other Than Pension (Details)	6 Months Ended
	Jun. 30, 2014
Pension Benefits
Pension Plan and Postretirement Benefits Other than Pension
Final number of years of employee's compensation to determine the benefits payable	10 years
Other Postretirement Benefits
Pension Plan and Postretirement Benefits Other than Pension
Age of retirees	65 years
Age of employees after which the plan does not provide benefits	65 years