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EMPLOYEE BENEFIT PLANS: (Details) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 01, 2013
Pension plans |  |  |  |  |
Employer contributions to profit sharing and retirement savings-investment plan |  | $ 1,117 tr_DefinedContributionPlanProfitSharingAndRetirementSavingsInvestmentPlans | $ 1,121 tr_DefinedContributionPlanProfitSharingAndRetirementSavingsInvestmentPlans | $ 1,107 tr_DefinedContributionPlanProfitSharingAndRetirementSavingsInvestmentPlans |
Deferred compensation |  |  |  |  |
Number of deferred compensation plans |  |  |  | 3 tr_NumberOfDeferredCompensationPlans |
Trading securities |  | 71,682 us-gaap_TradingSecurities | 63,215 us-gaap_TradingSecurities |  |
Pension Plan [Member] |  |  |  |  |
Pension plans |  |  |  |  |
Credited service period |  | 1 year |  |  |
Pension Expense |  | 4,391 us-gaap_PensionExpense / us-gaap_DefinedContributionPlanTypeAxis = us-gaap_PensionPlansDefinedBenefitMember | 4,437 us-gaap_PensionExpense / us-gaap_DefinedContributionPlanTypeAxis = us-gaap_PensionPlansDefinedBenefitMember | 4,327 us-gaap_PensionExpense / us-gaap_DefinedContributionPlanTypeAxis = us-gaap_PensionPlansDefinedBenefitMember |
Multi-employer defined benefit pension plan |  |  |  |  |
Pension plans |  |  |  |  |
Percentage of funded status |  |  |  |  | 66.41%tr_DefinedBenefitPlanFundedStatusOfPlanPercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_MultiemployerPlansPensionMember
Employer contributions to multi-employer defined benefit pension plans |  | 2,588 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_MultiemployerPlansPensionMember | 2,231 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_MultiemployerPlansPensionMember | 2,131 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_MultiemployerPlansPensionMember |
Deferred compensation |  |  |  |  |
Percentage of annual compounded surcharge for rehabilitation within ten years |  | 5.00%tr_MultiemployerPlansSurchargePercentageForRehabilitationInSpecifiedTerm / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_MultiemployerPlansPensionMember |  |  |
Percentage of interim surcharge | 5.00%tr_MultiemployerPlansSurchargePercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_MultiemployerPlansPensionMember |  |  |  |
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 |  | 56,400 tr_MultiemployerPlansEstimatedLiabilityUponWithdrawalPlanObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_MultiemployerPlansPensionMember |  | 37,200 tr_MultiemployerPlansEstimatedLiabilityUponWithdrawalPlanObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_MultiemployerPlansPensionMember |
Surcharges included in the employer contributions to multi-employer defined benefit pension plans |  | $ 342 tr_MultiemployerPlanPeriodSurchargeAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_MultiemployerPlansPensionMember | $ 242 tr_MultiemployerPlanPeriodSurchargeAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_MultiemployerPlansPensionMember |  |

X
- Definition Represents the percentage of funded status of the defined benefit plan asset as of the most recent year available. + References No definition available. + Details
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- Definition Amount of contributions made to profit sharing and retirement savings-investment plans. + References No definition available. + Details
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- Definition Service period for non-union employees, for the company to sponsor defined contribution pension plan. + References No definition available. + Details
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- Definition Represents the amount of surcharge included in the contributions made to multiemployer plans by the employer. + References No definition available. + Details
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- Definition Estimated amount of the obligation that would be recognized due to withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
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- Definition Represents the targeted period in which the plan is projected to emerge from critical status. + References No definition available. + Details
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- Definition Represents employer payable surcharge to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
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X
- Definition Represents employer payable compounded annual surcharge for rehabilitation within a specified period to the pension or postretirement benefit plan to which two or more unrelated employers contribute, where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
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- Definition Represents the projection period beyond which the plan is projected to emerge from critical status. + References No definition available. + Details
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- Definition Represents the number of deferred compensation plans for selected executives and other employees sponsored by the company. + References No definition available. + Details
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- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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