Annual report pursuant to Section 13 and 15(d)

COMMITMENTS & CONTINGENCIES (Details)

v2.4.1.9
COMMITMENTS & CONTINGENCIES (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 66 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
COMMITMENTS & CONTINGENCIES [Abstract]        
General and administrative expense included in dispute settlement expenses $ 0.6nog_GeneralAndAdministrativeExpenseIncludedInDisputeSettlementExpenses      
Estimated reversal of revenue $ 0.2nog_EstimatedReversalOfRevenue $ 0.3nog_EstimatedReversalOfRevenue $ 0.2nog_EstimatedReversalOfRevenue $ 1.7nog_EstimatedReversalOfRevenue