Pension Benefit and Other Postretirement Benefit Plans (Additional Information) (Details) (USD $)	9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended			9 Months Ended		3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Retirement Health and Life Insurance Benefits [Member]	Sep. 30, 2013 Retirement Health and Life Insurance Benefits [Member]	Sep. 30, 2014 Retirement Health and Life Insurance Benefits [Member]	Sep. 30, 2013 Retirement Health and Life Insurance Benefits [Member]	Sep. 30, 2014 Pension Benefits [Member]	Sep. 30, 2013 Pension Benefits [Member]	Jun. 30, 2013 Pension Benefits [Member]	Sep. 30, 2014 Pension Benefits [Member]	Sep. 30, 2013 Pension Benefits [Member]	Mar. 31, 2014 Former President and Chief Executive Officer [Member] Pension Benefits [Member]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Benefit payments												$ 800,000
Settlement charge										77,000		100,000
Curtailment charge									1,537,000		1,537,000
Employer contributions	$ 800,000	$ 0								$ 6,500,000	$ 13,000,000