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EMPLOYEE BENEFIT PLANS (Details 6) (PLC, Defined Benefit Pension Plan, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
EMPLOYEE BENEFIT PLANS
Total investments	$ 152,187	$ 125,058	$ 117,856
Employer contribution receivable		2,270
Total	152,187	127,328
Cash
EMPLOYEE BENEFIT PLANS
Total investments	6,222	1,004
Equity securities: Collective Russell 3000 Equity Index Fund
EMPLOYEE BENEFIT PLANS
Total investments	61,451	52,792
Equity securities, Fidelity Spartan U.S. Equity Index Fund
EMPLOYEE BENEFIT PLANS
Total investments	34,482	29,735
Fixed Income
EMPLOYEE BENEFIT PLANS
Total investments	$ 50,032	$ 41,527

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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