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FINANCIAL INSTRUMENTS AND OTHER FAIR VALUE DISCLOSURES
12 Months Ended
Dec. 31, 2014
FINANCIAL INSTRUMENTS AND OTHER FAIR VALUE DISCLOSURES [Abstract]  
FINANCIAL INSTRUMENTS AND OTHER FAIR VALUE DISCLOSURES
16.FINANCIAL INSTRUMENTS AND OTHER FAIR VALUE DISCLOSURES
The majority of NAT and its subsidiaries' transactions, assets and liabilities are denominated in United States dollars, the functional currency of the Company. There is no significant risk that currency fluctuations will have a negative effect on the value of the Company's cash flows.
The Company categorizes its fair value estimates using a fair value hierarchy based on the inputs used to measure fair value for those assets that are recorded on the Balance Sheet at fair value. The fair value hierarchy has three levels based on the reliability of the inputs used to determine fair value as follows:
Level 1.Quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity can access at the measurement date.
Level 2.Inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and
Level 3.Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.
The following methods and assumptions were used to estimate the fair value of each class of financial instruments and other financial assets.
-The carrying value of cash and cash equivalents and marketable securities, is a reasonable estimate of fair value.
-The estimated fair value for the long-term debt is considered to be equal to the carrying values since it bears spreads and variable interest rates which approximate market rates.
-The estimated fair value of the warrants in NAO was calculated based on a Black-Scholes model using comparative market data for other companies in the Platform Supply Vessel, or "PSV", segment to estimate volatility, and by assigning an estimated probability for achieving the exercise levels presented in Note 6.

The carrying value and estimated fair value of the Company`s financial instruments at December 31, 2015 and 2014 are as follows:
 
All figures in USD '000
 
Fair Value Hierarchy
Level
  
2015
Fair
Value
  
2015
Carrying
Value
  
2014
Fair
Value
  
2014
Carrying
Value
 
Cash and Cash Equivalents
  
1
   
29,889
   
29,889
   
100,736
   
100,736
 
Warrants in NAO
  
3
   
-
   
-
   
-
   
-
 
Credit Facility
  
2
   
(330,000
)
  
(330,000
)
  
(250,000
)
  
(250,000
)