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Retirement Benefits (Schedule of Changes in Projected Benefit Obligations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at beginning of year	$ 64,632	$ 56,787	$ 59,400
Interest cost	2,191us-gaap_DefinedBenefitPlanInterestCost	2,476us-gaap_DefinedBenefitPlanInterestCost
Benefits paid	(285)us-gaap_DefinedBenefitPlanBenefitsPaid	(1,426)us-gaap_DefinedBenefitPlanBenefitsPaid
Actuarial loss	(2,221)	6,795
Benefit obligation at end of year	$ 64,317	$ 64,632	$ 59,400

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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