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EMPLOYEE BENEFIT PLANS: (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 item | Dec. 31, 2011 | Jan. 02, 2012 | Jun. 30, 2012 Multi-employer defined benefit pension plan | Dec. 31, 2013 Multi-employer defined benefit pension plan | Dec. 31, 2013 Multi-employer defined benefit pension plan Minimum
Pension plans |  |  |  |  |  |  |
Credited service period | 1 year |  |  |  |  |  |
Pension expense | $ 4,437 | $ 4,327 | $ 4,011 |  |  |  |
Employer contributions to profit sharing and retirement savings-investment plan | 1,121 | 1,107 | 1,024 |  |  |  |
Percentage of funded status |  |  |  | 66.86% |  |  |
Employer contributions to multi-employer defined benefit pension plans | 2,231 | 2,131 | 2,046 |  |  |  |
Surcharges included in the employer contributions to multi-employer defined benefit pension plans | 242 | 65 |  |  |  |  |
Pension Plans |  |  |  |  |  |  |
Percentage of compounded annual surcharge each year |  |  |  |  |  | 5.00% |
Percentage of interim surcharge |  |  |  |  | 5.00% |  |
Projection period beyond which plan is projected to emerge from critical status, under the Rehabilitant Plan |  |  |  |  |  | 30 years |
Rehabilitation period |  |  |  |  |  |  | 10 years
Estimated liability upon withdrawal from plan in current year |  |  |  |  |  | 37,200 |
Deferred compensation |  |  |  |  |  |  |
Number of deferred compensation plans |  | 3 |  |  |  |  |
Trading securities | $ 63,215 | $ 49,378 |  |  |  |  |

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