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Earnings Per Common Share and Share Awards Summary of Information of Fixed Stock Options (Details) (USD $)
12 Months Ended
Dec. 31, 2014
$36.79 - $36.79  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options exercise price, lower limit $ 36.79us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
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Options exercise price, upper limit $ 36.79us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
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Options Outstanding - Number Outstanding 1,500us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
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Options Outstanding - Weighted Average Remaining Contractual Life 4 months 17 days
Options Outstanding - Weighted Average Exercise Price $ 36.79us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
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Options Exercisable - Number Exercisable 1,500us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
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Options Exercisable - Weighted Average Exercise Price $ 36.79us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
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$36.79 - $36.79  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options exercise price, lower limit $ 36.79us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
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Options exercise price, upper limit $ 36.79us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
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Options Outstanding - Number Outstanding 1,500us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
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Options Outstanding - Weighted Average Remaining Contractual Life 4 months 17 days
Options Outstanding - Weighted Average Exercise Price $ 36.79us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
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Options Exercisable - Number Exercisable 1,500us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
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Options Exercisable - Weighted Average Exercise Price $ 36.79us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
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$32.00 - $33.30  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
SARs exercise price, lower limit $ 32.00itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeLowerRangeLimit
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SARs exercise price, upper limit $ 33.30itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeUpperRangeLimit
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SAR Outstanding - Number Outstanding 2,000itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeNumberOfOutstandingShares
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SARs Outstanding - Weighted Average Remaining Contractual Life 1 year 4 months 20 days
SARs - Weighted Average Exercise Price $ 32.00itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeOutstandingAwardsWeightedAverageExercisePrice
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SARs Exercisable - Number Exercisable 2,000itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationPlansExercisePriceRangeNumberOfExercisableShares
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SARs Exercisable - Weighted Average Exercise Price $ 32.00itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeExercisableSharesWeightedAverageExercisePrice
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$33.31 - $41.49  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
SARs exercise price, lower limit $ 33.31itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeLowerRangeLimit
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SARs exercise price, upper limit $ 41.49itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeUpperRangeLimit
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SAR Outstanding - Number Outstanding 2,500itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeNumberOfOutstandingShares
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SARs Outstanding - Weighted Average Remaining Contractual Life 2 years 4 months 17 days
SARs - Weighted Average Exercise Price $ 33.31itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeOutstandingAwardsWeightedAverageExercisePrice
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SARs Exercisable - Number Exercisable 2,500itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationPlansExercisePriceRangeNumberOfExercisableShares
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SARs Exercisable - Weighted Average Exercise Price $ 33.31itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeExercisableSharesWeightedAverageExercisePrice
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$41.50 - $71.59  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
SARs exercise price, lower limit $ 41.50itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeLowerRangeLimit
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SARs exercise price, upper limit $ 71.59itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeUpperRangeLimit
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SAR Outstanding - Number Outstanding 15,000itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeNumberOfOutstandingShares
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SARs Outstanding - Weighted Average Remaining Contractual Life 4 years 5 months 23 days
SARs - Weighted Average Exercise Price $ 58.33itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeOutstandingAwardsWeightedAverageExercisePrice
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SARs Exercisable - Number Exercisable 13,875itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationPlansExercisePriceRangeNumberOfExercisableShares
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SARs Exercisable - Weighted Average Exercise Price $ 57.49itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeExercisableSharesWeightedAverageExercisePrice
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$32.00 - $71.59  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
SARs exercise price, lower limit $ 32.00itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeLowerRangeLimit
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SARs exercise price, upper limit $ 71.59itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeUpperRangeLimit
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SAR Outstanding - Number Outstanding 19,500itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeNumberOfOutstandingShares
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SARs Outstanding - Weighted Average Remaining Contractual Life 3 years 10 months 20 days
SARs - Weighted Average Exercise Price $ 52.42itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeOutstandingAwardsWeightedAverageExercisePrice
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SARs Exercisable - Number Exercisable 18,375itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationPlansExercisePriceRangeNumberOfExercisableShares
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SARs Exercisable - Weighted Average Exercise Price $ 51.43itic_ShareBasedCompensationSharesAuthorizedUnderStockAppreciationRightsPlansExercisePriceRangeExercisableSharesWeightedAverageExercisePrice
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