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OTHER NON-CURRENT ASSETS (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
OTHER NON-CURRENT ASSETS [Abstract]      
Fixture, Furniture and Equipment $ 1,099,000us-gaap_PropertyPlantAndEquipmentNet $ 1,129,000us-gaap_PropertyPlantAndEquipmentNet  
Warrants 0nat_WarrantsNonCurrent 915,000nat_WarrantsNonCurrent  
Deferred Finance Costs 2,232,000us-gaap_DeferredFinanceCostsNoncurrentNet 3,460,000us-gaap_DeferredFinanceCostsNoncurrentNet  
Long term deposit 5,000,000nat_LongTermDepositNoncurrent 5,000,000nat_LongTermDepositNoncurrent  
Total 8,331,000us-gaap_OtherAssetsNoncurrent 10,504,000us-gaap_OtherAssetsNoncurrent  
Revolving credit facility     430,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Credit facility costs $ 0us-gaap_PaymentsOfFinancingCosts $ 0us-gaap_PaymentsOfFinancingCosts $ 6,139,000us-gaap_PaymentsOfFinancingCosts