CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operation Activities
Net Loss	$ (12,808)us-gaap_NetIncomeLoss	$ (105,417)us-gaap_NetIncomeLoss	$ (73,192)us-gaap_NetIncomeLoss
Reconciliation of Net Loss to Net Cash Provided by (Used in) Operating Activates
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Impairment Loss on Vessel	0us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	12,030us-gaap_AssetImpairmentCharges
Loss on Contract	0us-gaap_GainLossOnContractTermination	5,000us-gaap_GainLossOnContractTermination	0us-gaap_GainLossOnContractTermination
Dry-dock Expenditure	(5,346)nat_DryDockExpenditures	(17,928)nat_DryDockExpenditures	(16,538)nat_DryDockExpenditures
Amortization of Deferred Finance Costs	1,228us-gaap_AmortizationOfFinancingCosts	1,228us-gaap_AmortizationOfFinancingCosts	1,365us-gaap_AmortizationOfFinancingCosts
Deferred Compensation Liability	782	832	1,391
Compensation- Restricted Shares	0nat_RestrictedSharesPeriodExpense	0nat_RestrictedSharesPeriodExpense	1,540nat_RestrictedSharesPeriodExpense
Share-based Compensation	997us-gaap_ShareBasedCompensation	2,093us-gaap_ShareBasedCompensation	1,258us-gaap_ShareBasedCompensation
Gain on Equity Method Investment	(3,285)us-gaap_GainLossOnSaleOfInvestments	0us-gaap_GainLossOnSaleOfInvestments	0us-gaap_GainLossOnSaleOfInvestments
Adjustment of warrants to fair value	915us-gaap_FairValueAdjustmentOfWarrants	0us-gaap_FairValueAdjustmentOfWarrants	0us-gaap_FairValueAdjustmentOfWarrants
Other, net	37us-gaap_OtherNoncashIncomeExpense	(5)us-gaap_OtherNoncashIncomeExpense	(170)us-gaap_OtherNoncashIncomeExpense
Changes in Operating Assets and Liabilities
Accounts Receivables	3,539	(11,435)	17,532
Accounts Receivables, Related Party	0	0	(11,291)
Inventory	2,438us-gaap_IncreaseDecreaseInInventories	3,528us-gaap_IncreaseDecreaseInInventories	3,538us-gaap_IncreaseDecreaseInInventories
Prepaid Expenses and Other Current Assets	300	(130)	7,799
Accounts Payable and Accrued Liabilities	2,784	(3,796)	(7,609)
Accounts Payable, Related party	0	0	610
Voyages in Progress	(14,633)	4,390	5,233
Non-current Related party Receivables	0	0	(13,282)
Net Cash Provided by (Used in) Operating Activities	57,479	(47,265)	(567)
Cash Flows from Investing Activities
Proceeds from Sale of Marketable Securities	0	600	0
Investment in Vessels	(73,772)nat_Paymentstoacquirevessel	(6,983)nat_Paymentstoacquirevessel	(2,745)nat_Paymentstoacquirevessel
Investment in Other Fixed Assets	(281)	(1,864)	0
Deposits and Loan Repayment from Seller	0	5,475	9,000
Investments in Nordic American Offshore Ltd	(11,403)	(65,004)	0
Acquisition of Orion Tankers Ltd	0	(271)	0
Cash arising from obtaining control of Orion Tankers Ltd	0nat_CashAssumedDuringPeriod	6,544nat_CashAssumedDuringPeriod	0nat_CashAssumedDuringPeriod
Acquisition of Scandic American Shipping Ltd, net of cash acquired	0	(7,641)	0
Acquisition of Scandic Assets Held for Sale	0	(5,467)	0
Proceeds from Sale of Scandic Assets held for Sale	0	5,467	0
Change in Restricted Cash	0	(5,000)	0
Return of Investments	3,772	0	0
Other, net	0	889	(129)
Net Cash Provided by (Used in) Investing Activities	(81,685)	(73,255)	6,126
Cash Flows from Financing Activities
Proceeds from Issuance of Common Stock	113,433	172,611	75,582
Proceeds from Use of Credit Facility	0us-gaap_ProceedsFromLinesOfCredit	40,000us-gaap_ProceedsFromLinesOfCredit	270,000us-gaap_ProceedsFromLinesOfCredit
Repayments on Credit Facility	0us-gaap_RepaymentsOfLinesOfCredit	(40,000)us-gaap_RepaymentsOfLinesOfCredit	(250,000)us-gaap_RepaymentsOfLinesOfCredit
Credit Facility Costs	0us-gaap_PaymentsOfFinancingCosts	0us-gaap_PaymentsOfFinancingCosts	(6,139)us-gaap_PaymentsOfFinancingCosts
Dividends Distributed	(54,069)us-gaap_PaymentsOfDividendsCommonStock	(41,756)us-gaap_PaymentsOfDividendsCommonStock	(63,497)us-gaap_PaymentsOfDividendsCommonStock
Net Cash Provided by Financing Activities	59,364	130,855	25,946
Net Increase in Cash and Cash Equivalents	35,158	10,335	31,505
Cash and Cash Equivalents at Beginning of Year	65,675	55,511	24,006
Effect of Exchange Rate changes on Cash and Cash Equivalents	(97)	(171)	0
Cash and Cash Equivalents at End of Year	100,736	65,675	55,511
Cash Paid for Interest	9,700us-gaap_InterestPaidNet	7,158us-gaap_InterestPaidNet	2,928us-gaap_InterestPaidNet
Cash Paid for Taxes	86us-gaap_IncomeTaxesPaidNet	214us-gaap_IncomeTaxesPaidNet	0us-gaap_IncomeTaxesPaidNet
Fair value of shares distributed as dividend in kind	$ 12,589	$ 0	$ 0

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