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STOCK PLANS (Details 5) (USD $)
12 Months Ended
Dec. 31, 2014
$10.24 - $15.00  
Range of Exercise Prices  
Range of exercise prices, low end of range (in dollars per share) $ 10.24us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange10.24DollarsTo15.00DollarsMember
Range of exercise prices, high end of range (in dollars per share) $ 15.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange10.24DollarsTo15.00DollarsMember
Options Outstanding  
Number of Options (in shares) 357,171us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange10.24DollarsTo15.00DollarsMember
Weighted- Average Remaining Contractual Life (years) 2 years 4 months 2 days
Weighted Average Exercise Price (in dollars per share) $ 11.20us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange10.24DollarsTo15.00DollarsMember
Options Exercisable  
Number of Options (in shares) 357,171us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange10.24DollarsTo15.00DollarsMember
Weighted- Average Exercise Price (in dollars per share) $ 11.20us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange10.24DollarsTo15.00DollarsMember
$15.01 - $18.77  
Range of Exercise Prices  
Range of exercise prices, low end of range (in dollars per share) $ 15.01us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange15.01DollarsTo18.77DollarsMember
Range of exercise prices, high end of range (in dollars per share) $ 18.77us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange15.01DollarsTo18.77DollarsMember
Options Outstanding  
Number of Options (in shares) 135,500us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange15.01DollarsTo18.77DollarsMember
Weighted- Average Remaining Contractual Life (years) 1 year 9 months
Weighted Average Exercise Price (in dollars per share) $ 18.00us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange15.01DollarsTo18.77DollarsMember
Options Exercisable  
Number of Options (in shares) 123,500us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange15.01DollarsTo18.77DollarsMember
Weighted- Average Exercise Price (in dollars per share) $ 18.20us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange15.01DollarsTo18.77DollarsMember
$18.78 - $23.47  
Range of Exercise Prices  
Range of exercise prices, low end of range (in dollars per share) $ 18.78us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange18.78DollarsTo23.47DollarsMember
Range of exercise prices, high end of range (in dollars per share) $ 23.47us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange18.78DollarsTo23.47DollarsMember
Options Outstanding  
Number of Options (in shares) 155,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange18.78DollarsTo23.47DollarsMember
Weighted- Average Remaining Contractual Life (years) 2 years 1 month 13 days
Weighted Average Exercise Price (in dollars per share) $ 22.68us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange18.78DollarsTo23.47DollarsMember
Options Exercisable  
Number of Options (in shares) 155,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange18.78DollarsTo23.47DollarsMember
Weighted- Average Exercise Price (in dollars per share) $ 22.68us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange18.78DollarsTo23.47DollarsMember
$10.24 - $23.47  
Range of Exercise Prices  
Range of exercise prices, low end of range (in dollars per share) $ 10.24us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange10.24DollarsTo23.47DollarsMember
Range of exercise prices, high end of range (in dollars per share) $ 23.47us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange10.24DollarsTo23.47DollarsMember
Options Outstanding  
Number of Options (in shares) 647,671us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange10.24DollarsTo23.47DollarsMember
Weighted- Average Remaining Contractual Life (years) 2 years 1 month 28 days
Weighted Average Exercise Price (in dollars per share) $ 15.37us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange10.24DollarsTo23.47DollarsMember
Options Exercisable  
Number of Options (in shares) 635,671us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange10.24DollarsTo23.47DollarsMember
Weighted- Average Exercise Price (in dollars per share) $ 15.36us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= knl_ExercisePriceRange10.24DollarsTo23.47DollarsMember