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Pension Benefit and Other Postretirement Benefit Plans (Additional Information) (Details) (USD $)	3 Months Ended		6 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013	Jun. 30, 2014 Retirement Health and Life Insurance Benefits [Member]	Jun. 30, 2013 Retirement Health and Life Insurance Benefits [Member]	Jun. 30, 2014 Retirement Health and Life Insurance Benefits [Member]	Jun. 30, 2013 Retirement Health and Life Insurance Benefits [Member]	Jun. 30, 2014 Pension Benefits [Member]	Jun. 30, 2013 Pension Benefits [Member]	Jun. 30, 2014 Pension Benefits [Member]	Jun. 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								(33,000)		77,000		100,000
Employer contributions	$ 0	$ 800,000	$ 0					$ 6,500,000			$ 6,500,000

The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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