Postretirement Benefit Plans (Details Textual) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Postretirement Benefit Plans (Textual) [Abstract]
Discount rate related to the postretirement plans	5.02%
Current portion of accrued postretirement benefit cost, included in salaries, wages and benefits	$ 5.6
Postretirement Benefit Plans [Member]
Postretirement Benefit Plans (Textual) [Abstract]
Discount rate related to the postretirement plans	4.59%