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Pension Benefit and Other Postretirement Benefit Plans - Fair Value of Net Assets by Asset Category (Details) (Pension Benefits [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Apr. 30, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Pension assets	$ 157,379	$ 156,741	$ 143,540
Pooled separate accounts [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets		33,530	29,869
Mutual funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets		106,619	98,269
Guaranteed deposit account [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension assets		$ 16,592	$ 15,402

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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