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Pension Plan (Details) - Weighted average asset allocations by asset category
Dec. 31, 2014
Dec. 31, 2013
Pension Plan (Details) - Weighted average asset allocations by asset category [Line Items]    
Total pension plan assets 100.00%us-gaap_DefinedBenefitPlanFundedPercentage 100.00%us-gaap_DefinedBenefitPlanFundedPercentage
Equity And Index Funds [Member]    
Pension Plan (Details) - Weighted average asset allocations by asset category [Line Items]    
Total pension plan assets 69.90%us-gaap_DefinedBenefitPlanFundedPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= tlx_EquityAndIndexFundsMember		 57.70%us-gaap_DefinedBenefitPlanFundedPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= tlx_EquityAndIndexFundsMember
Fixed Income Funds [Member]    
Pension Plan (Details) - Weighted average asset allocations by asset category [Line Items]    
Total pension plan assets 30.10%us-gaap_DefinedBenefitPlanFundedPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeFundsMember		 42.30%us-gaap_DefinedBenefitPlanFundedPercentage
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeFundsMember