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SIGNIFICANT ACCOUNTING POLICIES: Invest, VEBA, NP (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended
Mar. 29, 2014
Dec. 31, 2014
company
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2011
VEBA trust              
Cash and cash equivalents held by VEBA trust   $ 100,108us-gaap_CashAndCashEquivalentsAtCarryingValue $ 88,283us-gaap_CashAndCashEquivalentsAtCarryingValue $ 63,862us-gaap_CashAndCashEquivalentsAtCarryingValue $ 100,108us-gaap_CashAndCashEquivalentsAtCarryingValue $ 88,283us-gaap_CashAndCashEquivalentsAtCarryingValue $ 78,612us-gaap_CashAndCashEquivalentsAtCarryingValue
Goodwill and indefinite-lived intangible assets:              
Impairments of intangibles   0us-gaap_GoodwillAndIntangibleAssetImpairment 0us-gaap_GoodwillAndIntangibleAssetImpairment        
Equity method investment:              
Ownership interest in Spanish companies before increase (as a percent)     50.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage     50.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage  
Number of foreign companies that are accounted for using equity method   2tr_ForeignCompaniesAccountedForUsingEquityMethod          
Dividends paid by subsidiary   0us-gaap_CashDividendsPaidToParentCompanyBy50PercentOrLessOwnedPersons 0us-gaap_CashDividendsPaidToParentCompanyBy50PercentOrLessOwnedPersons 0us-gaap_CashDividendsPaidToParentCompanyBy50PercentOrLessOwnedPersons      
Pre-tax impairment charge     975us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment 850us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment      
Net loss on step acquisition 529us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementLoss 529us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementLoss          
Additional income tax provision 2,350us-gaap_SubsidiaryOrEquityMethodInvesteeDeferredIncomeTaxProvisionOnCumulativeGainLossRecognizedAmount            
Ownership interest in Spanish companies after step acquisition (as a percent)   83.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage     83.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage    
Total expected payment for additional stock   1,400tr_ExpectedTotalPaymentsToAcquireAdditionalInterestInSubsidiaries          
Payment for additional stock in Spanish companies   1,200us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries          
Loans Payable, Noncurrent [Abstract]              
Long-term Debt, Weighted Average Interest Rate   3.00%us-gaap_LongtermDebtWeightedAverageInterestRate     3.00%us-gaap_LongtermDebtWeightedAverageInterestRate    
VEBA Trust              
VEBA trust              
Contribution by entity to VEBA trust         1,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_TrustForBenefitOfEmployeesMember
15,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_TrustForBenefitOfEmployeesMember
 
VEBA Trust | Level 1              
VEBA trust              
Cash and cash equivalents held by VEBA trust   $ 10,845us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_TrustForBenefitOfEmployeesMember
$ 13,991us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_TrustForBenefitOfEmployeesMember
  $ 10,845us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_TrustForBenefitOfEmployeesMember
$ 13,991us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_TrustForBenefitOfEmployeesMember
 
Maximum              
Loans Payable, Noncurrent [Abstract]              
Debt Instrument, Term   4 years          
Minimum              
Loans Payable, Noncurrent [Abstract]              
Debt Instrument, Term   1 year