Tsakos Energy Navigation Limited 20-F 11 Apr 14 2013 FY Annual report (foreign) Financial data

Document_and_Entity_Informatio

Document and Entity Information	12 Months Ended
	Dec. 31, 2013
Document And Entity Information [Abstract]	'
Document Type	'20-F
Amendment Flag	'false
Document Period End Date	31-Dec-13
Document Fiscal Year Focus	'2013
Document Fiscal Period Focus	'FY
Entity Registrant Name	'TSAKOS ENERGY NAVIGATION LTD
Entity Central Index Key	'0001166663
Entity Current Reporting Status	'Yes
Entity Voluntary Filers	'No
Current Fiscal Year End Date	'--12-31
Entity Filer Category	'Accelerated Filer
Entity Well Known Seasoned Issuer	'No
Entity Common Stock Shares Outstanding	57,969,448

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
CURRENT ASSETS:	'	'
Cash and cash equivalents	$162,237	$144,297
Restricted cash	9,527	16,192
Marketable Securities (Note 4)	0	1,664
Accounts receivable, net	21,873	28,948
Insurance claims	2,569	4,583
Due from related companies (Note 2)	1,084	1,561
Advances and other	13,097	8,800
Inventories	19,660	14,356
Prepaid insurance and other	2,354	3,568
Current portion of financial instruments-Fair value (Note 15)	140	60
Total current assets	232,541	224,029
INVESTMENTS (NOTE 3)	1,000	1,000
FINANCIAL INSTRUMENTS-FAIR VALUE, net of current portion (Note 15)	1,438	45
FIXED ASSETS (Note 5)	'	'
Advances for vessels under construction	58,521	119,484
Vessels	2,710,418	2,628,094
Accumulated depreciation	-537,350	-539,736
Vessels' Net Book Value	2,173,068	2,088,358
Total fixed assets	2,231,589	2,207,842
DEFERRED CHARGES, net (Note 6)	17,331	17,968
Total assets	2,483,899	2,450,884
CURRENT LIABILITIES:	'	'
Current portion of long-term debt (Note 7)	126,361	186,651
Payables	52,319	34,390
Due to related companies (Note 2)	6,930	2,594
Accrued liabilities	16,628	12,442
Accrued bank interest	6,058	4,785
Unearned revenue	14,014	4,907
Current portion of financial instruments-Fair value (Note 15)	5,962	13,138
Total current liabilities	228,272	258,907
LONG-TERM DEBT, net of current portion (Note 7)	1,253,937	1,255,776
FINANCIAL INSTRUMENTS-FAIR VALUE, net of current portion (Note 15)	4,027	9,361
STOCKHOLDERS' EQUITY:	'	'
Preferred shares, $1.00 par value; 15,000,000 authorized and 2,000,000 Series B Preferred Shares and 2,000,000 Series C Preferred Shares issued and outstanding at December 31, 2013; no shares authorized, issued and outstanding at December 31, 2012	4,000	0
Common stock, $ 1.00 par value; 85,000,000 and 100,000,000 shares authorized at December 31, 2013 and December 31, 2012 respectively; 57,969,448 and 56,443,237 shares issued and outstanding at December 31, 2013 and 2012 respectively	57,969	56,443
Additional paid-in capital	500,737	404,391
Accumulated other comprehensive loss	-6,789	-14,728
Retained earnings	430,548	478,428
Total Tsakos Energy Navigation Limited stockholders' equity	986,465	924,534
Noncontrolling Interest (Note 12)	11,198	2,306
Total stockholders' equity	997,663	926,840
Total liabilities and stockholders' equity	$2,483,899	$2,450,884

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
			Preferred Class B Shares	Preferred Class B Shares	Preferred Class C Shares	Preferred Class C Shares
Preferred Shares - par value	$1	'	'	'	'	'
Preferred Shares - shares authorized	15,000,000	0	'	'	'	'
Preferred Shares - shares issued	'	'	2,000,000	0	2,000,000	0
Preferred Shares - shares outstanding	'	'	2,000,000	0	2,000,000	0
Common Stock - par value	$1	$1	'	'	'	'
Common Stock - shares authorized	85,000,000	100,000,000	'	'	'	'
Common Stock - shares issued	57,969,448	56,443,237	'	'	'	'
Common Stock - shares outstanding	57,969,448	56,443,237	'	'	'	'

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]	'	'	'
VOYAGE REVENUES:	$418,379	$393,989	$395,162
EXPENSES:	'	'	'
Commissions	16,019	12,215	14,290
Voyage expenses	116,980	111,797	127,156
Vessel operating expenses	130,760	133,251	129,884
Depreciation	95,349	94,340	101,050
Amortization of deferred dry-docking costs	5,064	4,910	4,878
Management fees (Note 2(a))	15,896	15,887	15,598
General and administrative expenses	4,366	4,093	4,292
Stock compensation expense (Note 9)	469	730	820
Foreign currency losses	293	30	458
Net loss/(gain) on sale of vessels	0	1,879	-5,001
Vessel impairment charge (Note 5)	28,290	13,567	39,434
Total expenses	413,486	392,699	432,859
Operating income/(loss)	4,893	1,290	-37,697
OTHER INCOME (EXPENSES):	'	'	'
Interest and finance costs, net (Note 8)	-40,917	-51,576	-53,571
Interest income	366	1,348	2,715
Other, net	-2,912	-118	-397
Total other expenses, net	-43,463	-50,346	-51,253
Net loss	-38,570	-49,056	-88,950
Less: Net loss/(income) attributable to the noncontrolling interest	1,108	-207	-546
Net loss attributable to Tsakos Energy Navigation Limited	-37,462	-49,263	-89,496
Effect of preferred dividends	-3,676	0	0
Net loss attributable to Tsakos Energy Navigation Limited common shareholders	($41,138)	($49,263)	($89,496)
Loss per share, basic and diluted attributable to Tsakos Energy Navigation Limited common shareholders	($0.73)	($0.92)	($1.94)
Weighted average number of shares, basic and diluted	56,698,955	53,301,039	46,118,534

STATEMENTS_OF_CONSOLIDATED_COM

STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME/(LOSS) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME/(LOSS) [Abstract]	'	'	'
Net loss	($38,570)	($49,056)	($88,950)
Unrealized gains/(losses) from hedging financial instruments	'	'	'
Unrealized gain on interest rate swaps, net	7,230	17,996	15,245
Amortization of deferred loss on de-designated financial instruments	877	2,173	2,020
Total unrealized gains from hedging financial instruments	8,107	20,169	17,265
Unrealized (loss)/gain on marketable securities	-79	228	34
Realized (gain)/loss on marketable securities reclassified to Statements of Operations	-89	-95	0
Other Comprehensive income	7,939	20,302	17,299
Comprehensive loss	-30,631	-28,754	-71,651
Less: comprehensive loss/(income) attributable to the noncontrolling interest	1,108	-207	-546
Comprehensive loss attributable to Tsakos Energy Navigation Limited	($29,523)	($28,961)	($72,197)

CONSOLIDATED_STATEMENTS_OF_STO

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Total	Preferred Shares	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Tsakos Energy Navigation Limited	Noncontrolling Interest
In Thousands
BALANCE, at Dec. 31, 2010	$1,019,930	$0	$46,081	$350,946	$671,480	($52,329)	$1,016,178	$3,752
Net income/(loss)	-88,950	'	'	'	-89,496	'	-89,496	546
Expenses of 2010 common stock-offering	-72	'	'	-72	'	'	-72	'
Issuance of shares of restricted share units (127,250, 234,500 and 96,000 in 2011, 2012 and 2013 respectively)	0	'	128	-128	'	'	0	'
Cash dividends paid ($0.60 per share in 2011, $0.50 per share in 2012 and $0.15 per share in 2013)	-27,670	'	'	'	-27,670	'	-27,670	'
Distribution from Subsidiary to non controlling interest	-2,199	'	'	'	'	'	0	-2,199
Other comprehensive income (loss)	17,299	'	'	'	'	17,299	17,299	'
Amortization of restricted share units	820	'	'	820	'	'	820	'
BALANCE, at Dec. 31, 2011	919,158	0	46,209	351,566	554,314	-35,030	917,059	2,099
Net income/(loss)	-49,056	'	'	'	-49,263	'	-49,263	207
Issuance of 10,000,000 shares	62,329	'	10,000	52,329	'	'	62,329	'
Issuance of shares of restricted share units (127,250, 234,500 and 96,000 in 2011, 2012 and 2013 respectively)	0	'	234	-234	'	'	0	'
Cash dividends paid ($0.60 per share in 2011, $0.50 per share in 2012 and $0.15 per share in 2013)	-26,623	'	'	'	-26,623	'	-26,623	'
Other comprehensive income (loss)	20,302	'	'	'	'	20,302	20,302	'
Amortization of restricted share units	730	'	'	730	'	'	730	'
BALANCE, at Dec. 31, 2012	926,840	0	56,443	404,391	478,428	-14,728	924,534	2,306
Net income/(loss)	-38,570	'	'	'	-37,462	'	-37,462	-1,108
Issuance of 8% Series B Preferred Shares	47,043	2,000	0	45,043	'	'	47,043	'
Issuance of 8.875% Series C Preferred Shares	47,315	2,000	'	45,315	'	'	47,315	'
Issuance of common stock under distribution agency agreement	7,045	'	1,430	5,615	'	'	7,045	'
Issuance of shares of restricted share units (127,250, 234,500 and 96,000 in 2011, 2012 and 2013 respectively)	0	'	96	-96	'	'	0	'
Capital contribution of noncontrolling interest owners	10,000	'	'	'	'	'	0	10,000
Cash dividends paid ($0.60 per share in 2011, $0.50 per share in 2012 and $0.15 per share in 2013)	-8,529	'	'	'	-8,529	'	-8,529	'
Other comprehensive income (loss)	7,939	'	'	'	'	7,939	7,939	'
Amortization of restricted share units	469	'	'	469	'	'	469	'
Dividends paid on Series B Preferred Shares	-1,889	'	'	'	-1,889	'	-1,889	'
BALANCE, at Dec. 31, 2013	$997,663	$4,000	$57,969	$500,737	$430,548	($6,789)	$986,465	$11,198

CONSOLIDATED_STATEMENTS_OF_STO1

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parentheticals) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY [Abstract]	'	'	'
Issuance of common shares	'	10,000,000	'
Restricted shares, number of shares issued	96,000	234,500	127,250
Cash dividends paid, per share	$0.15	$0.50	$0.60

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flows from Operating Activities:	'	'	'
Net loss	($38,570)	($49,056)	($88,950)
Adjustments to reconcile net loss to net cash provided by operating activities:	'	'	'
Depreciation	95,349	94,340	101,050
Amortization of deferred dry-docking costs	5,064	4,910	4,878
Amortization of loan fees	1,101	946	995
Stock compensation expense	469	730	820
Change in fair value of derivative instruments	-6,021	-2,832	515
Gain on sale of marketable securities	-89	-95	0
Loss/(gain) on sale of vessels	0	1,879	-5,001
Vessel impairment charge	28,290	13,567	39,434
Payments for dry-docking	-5,680	-7,566	-4,639
Increase/ Decrease in:	'	'	'
Receivables	5,269	-8,874	2,183
Inventories	-5,304	5,479	-5,824
Prepaid insurance and other	1,214	1,804	-2,423
Payables	22,265	12,214	77
Accrued liabilities	5,459	-4,022	4,192
Unearned revenue	9,107	-2,562	-1,720
Net Cash provided by Operating Activities	117,923	60,862	45,587
Cash Flows from Investing Activities:	'	'	'
Advances for vessels under construction and acquisitions	-37,182	-81,848	-37,937
Vessel acquisitions and/or improvements	-108,840	-2,454	-71,205
Purchase of marketable securities	0	0	-2,500
Proceeds from sale of marketable securities	1,585	1,098	0
Proceeds from the sale of vessels	0	40,219	42,455
Net Cash used in Investing Activities	-144,437	-42,985	-69,187
Cash Flows from Financing Activities:	'	'	'
Proceeds from long-term debt	110,000	83,558	96,650
Financing costs	-1,067	-1,550	-963
Payments of long-term debt	-172,129	-156,794	-143,454
(Increase)/Decrease in restricted cash	6,665	-10,208	307
Proceeds from stock issuance program, net	7,045	62,329	0
Proceeds from preferred stock issuance, net	94,358	0	0
Cash dividend	-10,418	-26,623	-27,670
Capital contribution from noncontrolling interest owners to subsidiary	10,000	0	0
Distribution from subsidiary to noncontrolling interest owners	0	0	-2,199
Net Cash provided by/(used in) Financing Activities	44,454	-49,288	-77,329
Net increase/(decrease) in cash and cash equivalents	17,940	-31,411	-100,929
Cash and cash equivalents at beginning of period	144,297	175,708	276,637
Cash and cash equivalents at end of period	162,237	144,297	175,708
Interest paid	'	'	'
Cash paid for interest, net of amounts capitalized	$44,057	$57,323	$48,588

Significant_Accounting_Policie

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Significant Accounting Policies [Abstract]	'
Significant Accounting Policies	'
	1.Significant Accounting Policies
	(a) Basis of presentation and description of business: The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) and include the accounts of Tsakos Energy Navigation Limited (the “Holding Company”), and its wholly-owned and majority-owned subsidiaries (collectively, the “Company”). As at December 31, 2013, 2012 and 2011, the Holding Company consolidated two variable interest entities (“VIE”) for which it is deemed to be the primary beneficiary, i.e. it has a controlling financial interest in those entities. A VIE is an entity that in general does not have equity investors with voting rights or that has equity investors that do not provide sufficient financial resources for the entity to support its activities. A controlling financial interest in a VIE is present when a company has the power to direct the activities of a VIE that most significantly impact the entity’s economic performance and absorbs a majority of an entity’s expected losses, receives a majority of an entity’s expected residual returns, or both.
	All intercompany balances and transactions have been eliminated upon consolidation.
	The Company follows the provisions of Accounting Standard Codification (ASC) 220, “Comprehensive Income”, which requires separate presentation of certain transactions, which are recorded directly as components of stockholders’ equity. The Company presents Other Comprehensive Income / (Loss) in a separate statement according to ASU 2011-05.
	The Company owns and operates a fleet of crude and product oil carriers and one LNG carrier providing worldwide marine transportation services under long, medium or short-term charters.
	(b)Use of Estimates: The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts of assets and liabilities and expenses, reported in the consolidated financial statements and the accompanying notes. Actual results could differ from those estimates.
	(c)Foreign Currency Translation: The functional currency of the Company is the U.S. Dollar because the Company’s vessels operate in international shipping markets in which the U.S. Dollar is utilized to transact most business. The accounting books of the Company are also maintained in U.S. Dollars. Transactions involving other currencies during the year are converted into U.S. Dollars using the exchange rates in effect at the time of the transactions. At the balance sheet dates, monetary assets and liabilities, which are denominated in other currencies, are translated into U.S. Dollars at the year-end exchange rates. Resulting gains or losses are separately reflected in the accompanying Consolidated Statements of Operations.
	(d)Cash and Cash Equivalents: The Company classifies highly liquid investments such as time deposits and certificates of deposit with original maturities of three months or less as cash and cash equivalents. Cash deposits with certain banks that may only be used for special purposes (including loan repayments) are classified as Restricted cash.
	(e)Trade Accounts Receivable, Net: Trade accounts receivable, net at each balance sheet date includes estimated recoveries from charterers for hire, freight and demurrage billings and revenue earned but not yet billed, net of an allowance for doubtful accounts (nil as of December 31, 2013 and 2012). The Company’s management at each balance sheet date reviews all outstanding invoices and provides allowances for receivables deemed uncollectible primarily based on the ageing of such balances and any amounts in dispute.
	(f)Inventories: Inventories consist of bunkers, lubricants, victualling and stores and are stated at the lower of cost or market value. The cost is determined primarily by the first-in, first-out method.
	(g)Fixed Assets: Fixed assets consist of vessels. Vessels are stated at cost, less accumulated depreciation. The cost of vessels includes the contract price and pre-delivery costs incurred during the construction and delivery of new buildings, including capitalized interest, and expenses incurred upon acquisition of second-hand vessels. Subsequent expenditures for conversions and major improvements are capitalized when they appreciably extend the life, increase the earning capacity or improve the efficiency or safety of the vessels; otherwise they are charged to expense as incurred. Expenditures for routine repairs and maintenance are expensed as incurred.
	Depreciation is provided on the straight-line method based on the estimated remaining economic useful lives of the vessels, less an estimated residual value based on a scrap price. Effective October 1, 2012 and following management’s reassessment of the residual value of the vessels, the estimated scrap value per light weight ton (LWT) was increased to $0.39 from $0.30. Management’s estimate was based on the average demolition prices prevailing in the market during the last ten years for which historical data were available. The effect of this change in accounting estimate, which did not require retrospective application as per ASC 250 “Accounting Changes and Error Corrections”, was to decrease net loss for the year ended December 31, 2012 by $929 or $0.02 per weighted average number of shares, both basic and diluted. The decrease in depreciation expense for the year ended December 31, 2013 was approximately $3,787 or $0.07 per weighted average number of shares, both basic and diluted, based on the Company’s fleet existing at December 31, 2012. Economic useful lives are estimated at 25 years for crude and product oil carriers and 40 years for the LNG carrier from the date of original delivery from the shipyard.
	(h)Impairment of Vessels: The Company reviews vessels for impairment whenever events or changes in circumstances indicate that the carrying amount of a vessel may not be recoverable, such as during severe disruptions in global economic and market conditions. When such indicators are present, a vessel to be held and used is tested for recoverability by comparing the estimate of future undiscounted net operating cash flows expected to be generated by the use of the vessel over its remaining useful life and its eventual disposition to its carrying amount. Net operating cash flows are determined by applying various assumptions regarding the use or possible disposition of each vessel, future revenues net of commissions, operating expenses, scheduled dry-dockings, expected off-hire and scrap values, and taking into account historical revenue data and published forecasts on future world economic growth and inflation. Should the carrying value of the vessel exceed its estimated future undiscounted net operating cash flows, impairment is measured based on the excess of the carrying amount over the fair market value of the asset. The Company determines the fair value of its vessels based on management estimates and assumptions and by making use of available market data and taking into consideration third party valuations. The review of the carrying amounts in connection with the estimated recoverable amount for certain of the Company’s vessels as of December 31, 2013, December 31, 2012 and 2011 indicated an impairment charge (Note 5).
	(i)Reporting Assets held for sale: It is the Company’s policy to dispose of vessels when suitable opportunities occur and not necessarily to keep them until the end of their useful life. Long-lived assets are classified as held for sale when all applicable criteria enumerated under ASC 360“Property, Plant, and Equipment” are met and are measured at the lower of their carrying amount or fair value less cost to sell. These assets are not depreciated once they meet the criteria to be held for sale. At December 31, 2013 and 2012, there were no vessels held for sale.
	(j)Accounting for Special Survey and Dry-docking Costs: The Company follows the deferral method of accounting for dry-docking and special survey costs whereby actual costs incurred are reported in Deferred Charges and are amortized on a straight-line basis over the period through the date the next dry-docking is scheduled to become due (approximately every five years during the first ten years of vessels’ life and every two and a half years within the following useful life of the vessels). Costs relating to routine repairs and maintenance are expensed as incurred. The unamortized portion of special survey and dry-docking costs for a vessel that is sold is included as part of the carrying amount of the vessel in determining the gain on sale of the vessel.
	(k)Loan Costs: Costs incurred for obtaining new loans or refinancing existing loans are capitalized and included in deferred charges and amortized over the term of the respective loan, using the effective interest rate method. Any unamortized balance of costs relating to loans repaid or refinanced as debt extinguishments is expensed in the period the repayment or extinguishment is made.
	(l)Accounting for Revenue and Expenses: Voyage revenues are generated from freight billings and time charter hire. Time charter revenue, including bare-boat hire, is recorded over the term of the charter as the service is provided. Revenues from voyage charters on the spot market or under contract of affreightment are recognized ratably from when a vessel becomes available for loading (discharge of the previous charterer’s cargo) to when the next charterer’s cargo is discharged, provided an agreed non-cancelable charter between the Company and the charterer is in existence, the charter rate is fixed or determinable and collectability is reasonably assured. Revenue under voyage charters will not be recognized until a charter has been agreed even if the vessel has discharged its previous cargo and is proceeding to an anticipated port of loading. Revenues from variable hire arrangements are recognized to the extent the variable amounts earned beyond an agreed fixed minimum hire are determinable at the reporting date and all other revenue recognition criteria are met. Revenue from hire arrangements with an escalation clause is recognized on a straight-line basis over the lease term unless another systematic and rational basis is more representative of the time pattern in which the vessel is employed. Vessel voyage and operating expenses and charter hire expense are expensed when incurred.
	Unearned revenue represents cash received prior to the year end for which related service has not been provided, primarily relating to charter hire paid in advance to be earned over the applicable charter period. The operating revenues and voyage expenses of vessels operating under a tanker pool are pooled and are allocated to the pool participants on a time charter equivalent basis, according to an agreed formula. Voyage revenues for 2013, 2012 and 2011 included revenues derived from significant charterers as follows (in percentages of total voyage revenues):
	Charterer	2013	2012	2011
	A	21%	17%	14%
	B	-	-	10%
	C	-	14%	-
	D	11%	-	-
	(m)Segment Reporting: The Company does not evaluate the operating results by type of vessel or by type of charter or by type of cargo. Although operating results may be identified by type of vessel, management, including the chief operating decision maker, reviews operating results primarily by revenue per day and operating results of the fleet. The Company operates a liquefied natural gas (LNG) carrier which meets the quantitative thresholds used to determine reportable segments. The chief operating decision maker does not review the operating results of this vessel separately, or makes any decisions about resources to be allocated to this vessel or assesses its performance separately, therefore, the LNG carrier does not constitute a separate reportable segment. The Company’s vessels operate on many trade routes throughout the world and, therefore, the provision of geographic information is considered impracticable by management. For the above reasons, the Company has determined that it operates in one reportable segment, the worldwide maritime transportation of liquid energy related products.
	(n)Derivative Financial Instruments: The Company regularly enters into interest rate swap contracts to manage its exposure to fluctuations of interest rates associated with its specific borrowings. Also, the Company enters into bunker swap contracts to manage its exposure to fluctuations of bunker prices associated with the consumption of bunkers by its vessels. Interest rate and bunker price differentials paid or received under these swap agreements are recognized as part of Interest and finance costs, net. All derivatives are recognized in the consolidated financial statements at their fair value. On the inception date of the derivative contract, the Company evaluates the derivative as an accounting hedge of the variability of cash flow to be paid of a forecasted transaction (“cash flow” hedge). Changes in the fair value of a derivative that is qualified, designated and highly effective as a cash flow hedge are recorded in other comprehensive income/(loss) until earnings are affected by the forecasted transaction. Changes in the fair value of undesignated derivative instruments and the ineffective portion of designated derivative instruments are reported in earnings in the period in which those fair value changes occur. Realized gains or losses on early termination of undesignated derivative instruments are also classified in earnings in the period of termination of the respective derivative instrument.
	The Company formally documents all relationships between hedging instruments and hedged items, as well as the risk-management objective and strategy for undertaking various hedge transactions. This process includes linking all derivatives that are designated as cash flow hedges of the variable cash flows of a forecasted transaction to a specific forecasted transaction. The Company also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivatives that are used in hedging transactions are highly effective in offsetting changes in cash flow of hedged items. When it is determined that a derivative is not highly effective as a hedge or that it has ceased to be a highly effective hedge, the Company discontinues hedge accounting prospectively. In accordance with ASC 815 “Derivatives and Hedging”, the Company may prospectively discontinue the hedge accounting for an existing hedge if the applicable criteria are no longer met, the derivative instrument expires, is sold, terminated or exercised or if the Company removes the designation of the respective cash flow hedge. In those circumstances, the net gain or loss remains in accumulated other comprehensive income / (loss) and is reclassified into earnings in the same period or periods during which the hedged forecasted transaction affects earnings, unless the forecasted transaction is no longer probable in which case the net gain or loss is reclassified into earnings immediately.
	(o)Fair Value Measurements: The Company follows the provisions of ASC 820, “Fair Value Measurements and Disclosures” which defines, and provides guidance as to the measurement of fair value. ASC 820 applies when assets or liabilities in the financial statements are to be measured at fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants (Note 15). Upon issuance of guidance on the fair value option in 2007, the Company elected not to report the then existing financial assets or liabilities at fair value that were not already reported as such.
	(p)Accounting for Leases: Leases of assets under which substantially all the risks and rewards of ownership are effectively retained by the lessor are classified as operating leases. Lease payments under an operating lease are recognized as an expense on a straight-line method over the lease term. The Company held no operating leases at December 31, 2013.
	(q)Stock Based Compensation: The Company has a share based incentive plan that covers directors and officers of the Company and employees of the related companies. Awards granted are valued at fair value and compensation cost is recognized on a straight line basis, net of estimated forfeitures, over the requisite service period of each award. The fair value of restricted stock issued to crew members, directors and officers of the Company at the grant date is equal to the closing stock price on that date and is amortized over the applicable vesting period using the straight-line method. The fair value of restricted stock issued to non-employees is equal to the closing stock price at the grant date adjusted by the closing stock price at each reporting date and is amortized over the applicable performance period (Note 9).
	(r)Marketable Securities: The Company from March 2011 until their disposal in July 2013 had investments in marketable securities that had readily determinable fair values and were classified as available for sale. Such investments were measured subsequently at fair value in the statement of financial position. Unrealized holding gains and losses for available for sale securities were excluded from earnings and were reported in Accumulated other comprehensive income/(loss) until realized (Note 4).
	(s)Recent Accounting Pronouncements: There are no recent accounting pronouncements issued in 2013, whose adoption would have a material impact on the Company’s Consolidated Financial Statements in the current year, or expected to have a material impact on future years.

Transactions_with_Related_Part

Transactions with Related Parties	12 Months Ended
	Dec. 31, 2013
Transactions with Related Parties [Abstract]	'
Transactions with Related Parties	'
	2.Transactions with Related Parties
	The following amounts were charged by related parties for services rendered:
		2013	2012	2011
	Tsakos Shipping and Trading S.A. (commissions)	5,219	5,304	5,461
	Tsakos Energy Management Limited (management fees)	15,487	15,587	15,298
	Tsakos Columbia Shipmanagement S.A.	1,621	1,280	1,237
	Argosy Insurance Company Limited	9,129	9,701	9,933
	AirMania Travel S.A.	4,810	3,661	2,129
	Total expenses with related parties	36,266	35,533	34,058
	Balances due from and to related parties are as follows:
		December 31,
	Due from related parties	2013	2012
	Tsakos Columbia Shipmanagement Ltd	1,084	1,561
	Total due from related parties	1,084	1,561
	Due to related parties
	Tsakos Shipping and Trading S.A.	555	1,110
	Tsakos Energy Management Limited	92	53
	Argosy Insurance Company Limited	6,008	1,209
	AirMania Travel S.A.	275	222
	Total due to related parties	6,930	2,594
	There is also, at December 31, 2013 an amount of $319 ($559 in 2012) due to Tsakos Shipping and Trading S.A. and $356 ($329 in 2012) due to Argosy Insurance Limited, included in Accrued liabilities which relates to services rendered by related parties not yet invoiced.
	(a)Tsakos Energy Management Limited (the “Management Company”): The Holding Company has a Management Agreement (“Management Agreement”) with the Management Company, a Liberian corporation, to provide overall executive and commercial management of its affairs for a monthly fee. Per the Management Agreement of March 8, 2007, effective from January 1, 2008, there is a prorated adjustment if at the beginning of each year the Euro has appreciated by 10% or more against the U.S. Dollar since January 1, 2007. In addition, there is an increase each year by a percentage figure reflecting 12 month Euribor, if both parties agree. From January 1, 2011, the monthly management fees for operating vessels were $27.0 per owned vessel except for the LNG carrier which bore a monthly fee of $32.0, of which $7.0 was paid to the Management Company and $25.0 to a third party manager. The monthly management fees for chartered-in vessels or for owned vessels chartered out on a bare-boat basis were $20.0. From January 1, 2012 until December 31, 2013 monthly fees for operating vessels were $27.5, for vessels chartered out or on a bare-boat basis were $20.4 and from April 1, 2012 for the LNG carrier $35.0 of which $10.0 was paid to the Management Company and $25.0 to a third party manager. Monthly management fees for the DP2 shuttle tankers have been agreed at $35.0 per vessel. Since the expiry of the bareboat charter of the VLCC Millennium on July 30, 2013, management fees for this vessel are $27.5 per month of which $13.7 are payable to a third party manager. Management fees for the suezmax Eurochampion 2004 are $27.5 per month of which, effective September 22, 2013, $12.0 are payable to a third party manager.
	In addition to the management fee, the Management Agreement provides for an incentive award to the Management Company, which is at the absolute discretion of the Holding Company’s Board of Directors. The incentive award program is based on the Company’s annual return on equity (“ROE”). In 2013, 2012 and 2011, there was no such award. However, special awards totaling $500 were paid to the Management Company in relation to capital raising offerings during 2013. These awards have been included as a deduction of additional paid in capital in the accompanying Consolidated Financial Statements.
	The Holding Company and the Management Company have certain officers and directors in common. The President, who is also the Chief Executive Officer and a Director of the Holding Company, is also the sole stockholder of the Management Company. The Management Company may unilaterally terminate its Management Agreement with the Holding Company at any time upon one year’s notice. In addition, if even one director was elected to the Holding Company’s Board of Directors without having been recommended by the existing board, the Management Company would have the right to terminate the Management Agreement on ten days notice, and the Holding Company would be obligated to pay the Management Company the present discounted value of all payments that would have otherwise been due under the main agreement up until June 30 of the tenth year following the date of the termination plus the average of the incentive awards previously paid to TEM multiplied by 10. As at December 31, 2013 such payment would be approximately $145,291 calculated in accordance with the terms of the Management Agreement. This amount takes account of the LNG carrier and the five aframaxes under construction, but excludes the new-building which is being negotiated with the shipyard (Note 14). Under the terms of the Management Agreement between the Holding Company and the Management Company, the Holding Company may terminate the Management Agreement only under specific circumstances, without the prior approval of the Holding Company’s Board of Directors.
	Estimated future management fees payable over the next ten years under the Management Agreement, exclusive of any incentive awards and based on existing vessels and known vessels as at December 31, 2013, scheduled for future delivery, are:
	Year	Amount
	2014	16,971
	2015	16,971
	2016	16,973
	2017	17,251
	2018	17,272
	2019 to 2023	77,724
		163,162
	Management fees for vessels are included in the accompanying Consolidated Statements of Operations. Also, under the terms of the Management Agreement, the Management Company provides supervisory services for the construction of new vessels for a monthly fee, per vessel, of $20.4 in 2013, ($20.4 and $20.0 for 2012 and 2011, respectively). These fees in total amounted to $492, $612 and $588 for 2013, 2012 and 2011, respectively, and are either accounted for as part of construction costs for delivered vessels or are included in Advances for vessels under construction.
	(b)Tsakos Columbia Shipmanagement S.A. (“TCM”): The Management Company appointed TCM to provide technical management to the Company’s vessels from July 1, 2010. TCM is owned jointly and in equal part by Tsakos family private interests and by a private German group. TCM, at the consent of the Holding Company, may subcontract all or part of the technical management of any vessel to an alternative unrelated technical manager.
	Effective July 1, 2010, the Management Company, at its own expense, pays technical management fees to TCM, and the Company bears and pays directly to TCM most of its operating expenses, including repairs and maintenance, provisioning and crewing of the Company’s vessels, as well as certain charges which are capitalized or deferred, including reimbursement of the costs of TCM personnel sent overseas to supervise repairs and perform inspections on Company vessels. The Company also pays to TCM certain fees to cover expenses relating to internal control procedures and information technology services which are borne by TCM on behalf of the Company.
	(c)Tsakos Shipping and Trading S.A. (“Tsakos Shipping”):  Tsakos Shipping provides chartering services for the Company’s vessels by communicating with third party brokers to solicit research and propose charters. For this service, the Company pays to Tsakos Shipping a chartering commission of 1.25% on all freights, hires and demurrages. Such commissions are included in Commissions in the accompanying Consolidated Statements of Operations. Tsakos Shipping also provides sale and purchase of vessels brokerage service. For this service, Tsakos Shipping may charge brokerage commission. In 2012 and 2011, this commission was approximately 1% of the sale price of a vessel. In 2013, there were no sales or purchases of vessels.
	Tsakos Shipping may also charge a fee of $200 (or such other sum as may be agreed) on delivery of each new-building vessel in payment for the cost of design and supervision of the new-building by Tsakos Shipping. This amount is added to the cost of the vessels concerned and is being amortized over the remaining life of the vessels. In 2013 and 2012, no such fee was charged.
	Certain members of the Tsakos family are involved in the decision-making processes of Tsakos Shipping and of the Management Company, and are also shareholders, and directors of the Holding Company.
	(d)Argosy Insurance Company Limited (“Argosy”): The Company places its hull and machinery insurance, increased value insurance and war risk and certain other insurance through Argosy, a captive insurance company affiliated with Tsakos Shipping.
	(e)AirMania Travel S.A. (“AirMania”): Apart from third-party agents, the Company also uses an affiliated company, AirMania, for travel services.

Longterm_Investments

Long-term Investments	12 Months Ended
	Dec. 31, 2013
Long-term investments [Abstract]	'
Long-term investments	'
	3.Long-term Investments
	At December 31, 2013 and 2012, the Company held 125,000 common shares at a total cost of $1,000 in a private U.S. company which undertakes research into synthetic genomic processes which may have a beneficial environmental impact within the energy and maritime industries. Management has determined that there has been no impairment to the cost of this investment since its acquisition in 2007. A Director of the Company is a former officer and currently a shareholder and a consultant of this company. No income was received from this investment during 2013, 2012 and 2011.

Marketable_Securities

Marketable Securities	12 Months Ended
	Dec. 31, 2013
Marketable securities [Abstract]	'
Marketable securities	'
	4.Marketable securities
	In March 2011, the Company placed $2,500 in highly liquid, low risk marketable securities which are considered to be available-for-sale for reporting purposes. In December 2012, the Company sold $1,098 of these marketable securities realizing a gain of $95 which was reclassified from Accumulated other comprehensive income/(loss) to the Statement of Operations. In July 2013, the Company sold the remaining marketable securities realizing a gain of $89, reclassified from Accumulated other Comprehensive income/(loss) to the statement of Operations. At December 31, 2013 there are no marketable securities. The fair value of the marketable securities as of December 31, 2012 was $1,664, and the change in fair value amounting to $133(positive) was included in Accumulated other comprehensive income/(loss).

Vessels

Vessels	12 Months Ended
	Dec. 31, 2013
Vessels [Abstract]	'
Vessels	'
	5.Vessels
	Acquisitions
	During 2013, the Company took delivery of two newbuilding DP2 suezmax shuttle tankers Rio 2016 and Brasil 2014, at a total cost of $203,908 of which $105,763 was incurred in 2013. In 2012, there were no vessel acquisitions. In 2011, the Company took delivery of two newly constructed suezmaxes Spyros K and Dimitris P at a total cost of $148,526 of which $66,643 was incurred within 2011.
	Sales
	There were no vessel sales in 2013. In 2012, the Company sold the VLCCs La Madrina and La Prudencia, classified as held for sale at December 31, 2011, for net proceeds of $40,219 in total, realizing a loss of $1,879. In 2011, the Company sold the aframax tanker Opal Queen for net proceeds of $32,753 realizing a gain of $5,802 and the aframax tanker Vergina II for net proceeds of $9,702 realizing a loss of $801(net gain of $5,001in aggregate). The capital gains or losses from the sale of vessels are separately reflected in the accompanying 2011 Consolidated Statements of Operations.
	Impairment
	As of December 31, 2013, the Company reviewed the carrying amount in connection with the estimated recoverable amount for each of its vessels. This review indicated that such carrying amount was not fully recoverable for four of the Company’s vessels; Silia T, Triathlon, Delphi and Millennium. Consequently the carrying value of these four vessels, totaling $123,540 has been written down to $95,250, based on level 2 inputs of the fair value hierarchy, as determined by management taking into consideration valuations from independent marine valuers (Note 15(c)). The resulting impairment charge was $28,290 and is reflected in the accompanying Consolidated Statements of Operations. During 2012, the carrying value of the VLCC Millennium was written down resulting in a total impairment charge of $13,567. During 2011, the carrying values of the VLCCs La Madrina and La Prudencia were written down resulting in a total impairment charge of $39,434.

Deferred_Charges

Deferred Charges	12 Months Ended
	Dec. 31, 2013
Deferred Charges [Abstract]	'
Deferred Charges	'
	6.Deferred Charges
	Deferred charges, consist of dry-docking and special survey costs, net of accumulated amortization, amounted to $12,724 and $13,327 at December 31, 2013 and 2012, respectively, and loan fees, net of accumulated amortization, amounted to $4,607 and $4,641 and at December 31, 2013 and 2012, respectively. Amortization of deferred dry-docking costs is separately reflected in the accompanying Consolidated Statements of Operations, while amortization of loan fees is included in Interest and finance costs, net (Note 8).

LongTerm_Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2013
Long-Term Debt [Abstract]	'
Long-Term Debt	'
	7.Long–Term Debt
	Facility	2013	2012
	(a) Credit facilities	808,218	939,514
	(b) Term bank loans	572,080	502,913
	Total	1,380,298	1,442,427
	Less – current portion	-126,361	-186,651
	Long-term portion	1,253,937	1,255,776
	(a)Credit facilities
	As at December 31, 2013, the Company had six open reducing revolving credit facilities, all of which are reduced in semi-annual installments, and two open facilities which have both a reducing revolving credit component and a term bank loan component. At December 31, 2013 and 2012 there was no available unused amount. The aggregate available unused amount under these facilities at December 31, 2011 was $28,358 and was drawn down on January 17, 2012. Interest is payable at rates based on LIBOR plus a spread. At December 31, 2013, the interest rates on these facilities ranged from 1.48% to 5.69% (0.81% to 5.19% at December 31, 2012).
	(b)Term bank loans
	Term loan balances outstanding at December 31, 2013 amounted to $572,080.
	On March 6, 2013 and on April 22, 2013 the Company made two drawdowns of $46,000 each under two existing term bank loans to finance the newly delivered DP2 suezmax shuttle tankers Rio 2016 and Brasil 2014.
	On September 9, 2013, the Company arranged a new term bank loan for the refinancing of the credit facility obtained in 2005 to finance the acquisition of the aframax tanker Sakura Princess. On September 11, 2013, the Company fully repaid the then outstanding balance of this facility. On September 11, 2013, the Company drew down $18,000 under the new term loan, which is payable in 28 quarterly installments, the first eight of $300 each and the next twenty of $405 each plus a balloon of $7,500 payable with the last installment.
	All term bank loans, except the newly signed on September 9, 2013, which is paid in quarterly installments, are payable in U.S. Dollars in semi-annual installments, with balloon payments due at maturity between October 2016 and April 2022. Interest rates on the outstanding loans as at December 31, 2013 are based on LIBOR plus margin. At December 31, 2013, the interest rates on these term bank loans ranged from 1.85% to 3.24%.
	The weighted-average interest rates on the above executed loans for the applicable periods were:
	Year ended December 31, 2013	2.49%
	Year ended December 31, 2012	1.87%
	Year ended December 31, 2011	1.66%
	Loan movements for credit facilities and term loans throughout 2013:
	Loan	Origination	Original	Balance at	New	Repaid	Balance at
		Date	Amount	January 1,	Loans		December 31,
				2013			2013
	Credit facility1	2005	250,000	34,855	—	34,855	—
	Credit facility	2005	220,000	134,225	—	13,135	121,090
	Credit facility	2006	275,000	125,092	—	11,823	113,270
	Credit facility2	2004	179,384	112,356	—	10,555	101,800
	Credit facility3	2005	220,000	92,550	—	26,952	65,598
	Credit facility	2006	371,010	251,010	—	20,000	231,010
	10-year term loan	2004	71,250	32,032	—	3,125	28,907
	Credit facility	2006	70,000	35,625	—	4,375	31,250
	Credit facility	2007	120,000	92,500	—	5,000	87,500
	10-year term loan	2007	88,350	66,270	—	5,520	60,750
	Credit facility	2007	82,000	61,300	—	4,600	56,700
	10-year term loan	2009	38,600	29,046	—	2,235	26,812
	8-year term loan	2009	40,000	30,400	—	2,900	27,500
	12 year term loan	2009	40,000	33,750	—	2,500	31,250
	10-year term loan	2010	39,000	32,500	—	2,600	29,900
	7-year term loan	2010	70,000	60,720	—	4,640	56,080
	10-year term loan	2010	43,924	37,489	—	3,218	34,271
	9-year term loan	2010	42,100	36,900	—	2,600	34,300
	10-year term loan	2011	48,000	43,200	—	3,200	40,000
	9-year term loan	2011	48,650	45,407	—	3,243	42,163
	8-year term loan	2012	73,600	27,600	46,000	2,300	71,300
	8-year term loan	2011	73,600	27,600	46,000	2,453	71,147
	7-year term loan	2013	18,000	—	18,000	300	17,700
	Total			1,442,427	110,000	172,129	1,380,298
	1 The Company sold one of its vessels (La Madrina) secured under this credit facility within 2012 and accordingly, prepaid an amount of $23,600. In 2013, the Company fully repaid the outstanding amount of the loan and refinanced the remaining vessel (Sakura Princess) previously financed by the repaid loan with a new loan, included in the above table.
	2 This credit facility includes a fixed interest rate portion amounting to $53,243 as at December 31, 2013.
	3 The Company sold one of its vessels (La Prudencia) secured under this credit facility within 2012 and accordingly, on January 31, 2013, prepaid an amount of $20,352.
	The above revolving credit facilities and term bank loans are secured by first priority mortgages on all vessels, by assignments of earnings and insurances of the respectively mortgaged vessels, and by corporate guarantees of the relevant ship-owning subsidiaries.
	The loan agreements include, among other covenants, covenants requiring the Company to obtain the lenders’ prior consent in order to incur or issue any financial indebtedness, additional borrowings, pay dividends in an amount more than 50% of cumulative net income (as defined in the related agreements), sell vessels and assets, and change the beneficial ownership or management of the vessels. Also, the covenants require the Company to maintain a minimum liquidity, not legally restricted, of $78,144 ($99,375 in 2012 and $92,188 in 2011 respectively), a minimum hull value in connection with the vessels’ outstanding loans, insurance coverage of the vessels against all customary risks and maintenance of operating bank accounts with minimum balances.
	As at December 31, 2013 and 2012, the Company was in non-compliance with minimum value-to-loan ratios contained in certain of its debt agreements. In case of non-compliance with minimum value-to-loan ratios these agreements include terms according to which the Company may be required to prepay indebtedness in the form of cash or provide additional security. Effective since December 31, 2012 and for a period up to, and including, June 30, 2014, certain of the Company’s lenders formally waived their rights resulting from the aforementioned non-compliance of the value-to-loan covenant, while the remainder did not seek immediate remedial action.
	An amount of $5,867, relating to one term loan with outstanding principal of $34,300 at December 31, 2013 was reclassified within current liabilities at December 31, 2013, representing the amount that the Company would be required to pay to satisfy the value-to-loan ratio shortfall contained in the loan agreement in the event the lender was to request such additional security in the form of cash payment.
	As at December 31, 2012, the Company was in non-compliance with the leverage ratio required by its loans. In this respect, the Company entered into amendatory agreements with its lenders which waive the non-compliance of the leverage ratio covenant referred to above by increasing the relevant ratio for the period from December 31, 2012 through July 1, 2014 from 70% to 80%, establishing in this respect compliance as at December 31, 2013 and 2012. Following these amendatory agreements and because management concluded that it is not probable that the amended ratio will fail to be met at any next measurement dates within the following 12 months, the debt was not classified as current in the 2013 and 2012 consolidated balance sheet in accordance with ASC 470-10. At December 31, 2013, the Company was fully compliant with the leverage ratio required by its loans irrespective of the waivers.
	As of December 31, 2012, a subsidiary, in which the Company has a 51% interest, was not in compliance with the leverage ratio required by its loan. In this respect, in an amendatory agreement dated April 8, 2013 with the lenders, an existing waiver of the leverage ratio non-compliance was extended to June 30, 2014 (inclusive). At December 31, 2013, the subsidiary was fully compliant with the loan agreement.
	The Company’s liquidity requirements relate primarily to servicing its debt, funding the equity portion of investments in vessels and funding expected capital expenditure on dry-dockings and working capital. As of December 31, 2013, the Company’s working capital (non-restricted net current assets), amounted to a deficit of $5,258. Net cash flow generated from operations is the Company’s main source of liquidity whereas other management alternatives to ensure service of the Company’s commitments include, but are not limited to, the issuance of additional equity, re-negotiation of new-building commitments and utilization of suitable opportunities for asset sales, etc. Management believes, such alternatives along with current available cash holdings and cash expected to be generated from the operation of vessels, will be sufficient to meet the Company’s liquidity and working capital needs for a reasonable period of time.
	The annual principal payments required to be made after December 31, 2013, excluding hull cover ratio shortfall of $5,867 discussed above, are as follows:
	Year	Amount
	2014	120,495
	2015	174,842
	2016	270,406
	2017	182,805
	2018	297,431
2019 and thereafter	334,319
	1,380,298

Interest_and_Finance_Costs_net

Interest and Finance Costs, net	12 Months Ended
	Dec. 31, 2013
Interest and Finance Costs, net [Abstract]	'
Interest and Finance Costs, net	'
	8.Interest and Finance Costs, net
		2013	2012	2011
	Interest expense	41,741	49,701	51,720
	Less: Interest capitalized	-1,945	-1,758	-2,532
	Interest expense, net	39,796	47,943	49,188
	Interest swap cash settlements non-hedging	5,012	8,043	8,977
	Bunkers swap cash settlements	-151	-2,433	-6,382
	Amortization of loan fees	1,101	946	995
	Bank charges	379	243	277
	Amortization of deferred loss on termination of financial instruments	877	2,173	2,020
	Change in fair value of non-hedging financial instruments	-6,097	-5,339	-1,504
	Net total	40,917	51,576	53,571
	At December 31, 2013, the Company was committed to seven floating-to-fixed interest rate swaps with major financial institutions covering notional amounts aggregating to $343,827 maturing from March 2014 through March 2021, on which it pays fixed rates averaging 3.89% and receives floating rates based on the six-month London interbank offered rate (“LIBOR”) (Note 15).
	At December 31, 2013, the Company held five of the seven interest rate swap agreements, designated and qualifying as cash flow hedges, in order to hedge its exposure to interest rate fluctuations associated with its debt covering notional amounts aggregating to $221,077.
	The fair value of such financial instruments as of December 31, 2013 and 2012 in aggregate amounted to $3,409 (negative) and $11,295 (negative), respectively. The estimated net amount of cash flow hedge losses at December 31, 2013 that is estimated to be reclassified into earnings within the next twelve months is $2,082.
	At December 31, 2013 and 2012, the Company held two interest rate swaps that did not meet hedge accounting criteria. As such, the changes in their fair values during 2013 and 2012 have been included in change in fair value of non-hedging financial instruments in the table above, and amounted to $6,025 (positive) and $6,989 (positive), respectively. In March 2010, one of these swaps was de-designated as a hedging swap and the remaining loss included in Accumulated other comprehensive loss, and for which the associated future cash flows are deemed probable of occurring ($154 at December 31, 2013), is being amortized to income over the term of the original hedge provided that the variable-rate interest obligations continue. The amount of such loss amortized during 2013 and 2012 was $877 and $1,475, respectively and the remaining balance of $154 at December 31, 2013 will be fully amortized in the first quarter of 2014. In addition, in December 2012 and June 2011, two vessels financed by the loan previously hedged by the de-designated swap, were sold and the loss within Accumulated other comprehensive income/(loss) of $698 in 2012 and $506 in 2011 that was considered to be directly associated with future cash flows, which were not probable of occurring, was immediately reclassified to income.
	At December 31, 2013 and 2012, the Company had five and two bunker swap agreements, respectively, in order to hedge its exposure to bunker price fluctuations associated with the consumption of bunkers by its vessels. During 2011, the Company entered into one bunker swap agreement and disposed of it prior to maturity resulting in a realized gain of $115 which is included in Bunker swap cash settlements in the table above. The fair value of these financial instruments as of December 31, 2013 and 2012 was $177 (positive) and $105 (positive), respectively and the changes in their fair values during 2013 and 2012 amounting to $72 (positive) and $1,650 (negative), respectively have been included in Change in fair value of non-hedging financial instruments in the table above, as such agreements do not meet the hedging criteria.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2013
Stockholders' Equity [Abstract]	'
Stockholders' Equity	'
	9.Stockholders’ Equity
	The Company has a shareholder rights plan that authorizes to existing shareholders substantial preferred share rights and additional common shares if any third party acquires 15% or more of the outstanding common shares or announces its intent to commence a tender offer for at least 15% of the common shares, in each case, in a transaction that the Board of Directors has not approved.
	On May 10, 2013 the Company re-designated 15,000,000 of common stock as preferred shares of $1.00 par value.
	On May 10, 2013, the Company issued 2,000,000 8.00% Cumulative Redeemable Perpetual Series B Preferred Shares (the “Series B preferred shares”) for net proceeds of $47,043. The Series B preferred shares were issued for cash and pay cumulative quarterly dividends at a rate of 8% per annum from their date of issuance, i.e. $2.0 per preferred share or $4,000 in aggregate. At any time on or after July 30, 2018, the Series B preferred shares may be redeemed, at the option of the Company, in whole or in part at a redemption price of $25.00 per share plus unpaid dividends. If the Company fails to comply with certain covenants relating to the level of borrowings and net worth as these terms are defined in the applicable agreement, defaults on any of its credit facilities, fails to pay four quarterly dividends payable in arrears or if the Series B preferred shares are not redeemed at the option of the Company, in whole by July 30, 2019, the dividend rate payable on the Series B preferred shares increases quarterly to a rate that is 1.25 times the dividend rate payable on the series B preferred shares , subject to an aggregate maximum rate per annum of 25% prior to July 30, 2018 and 30% thereafter. The Series B preferred shares are not convertible into common shares and are not redeemable at the option of the holder. The initial dividend of $889 on the Series B preferred shares was paid on July 30, 2013, the second dividend of $1,000 was paid on October 30, 2013 and the third dividend of $1,000 was paid on January 30, 2014 (Note 16(b)).
	On August 8, 2013 the Company entered into a distribution agency agreement with a leading investment bank as manager, providing for the offer and sale from time to time of up to 4,000,000 common shares of the Company, par value $1.0 per share, at market prices. As of December 31, 2013, the Company had sold 1,430,211 common shares under this agreement for proceeds, net of commissions and other issuance expenses, of $7,045. From January 1, 2014 up to January 17, 2014, the Company sold 1,077,847 common shares for proceeds, net of commissions, of $7,170.
	On September 30, 2013, the Company issued 2,000,000 8.875% Cumulative Redeemable Perpetual Series C Preferred Shares (the “Series C preferred shares”) for net proceeds of $47,315. The Series C preferred shares were issued for cash and pay cumulative quarterly dividends at a rate of 8.875% per annum from their date of issuance, i.e. $2.21875 per preferred share or $4,438 in aggregate. At any time on or after October  30, 2018, the Series C preferred shares may be redeemed, at the option of the Company, in whole or in part at a redemption price of $25.00 per share plus unpaid dividends. If the Company fails to comply with certain covenants relating to the level of borrowings and net worth as these terms are defined in the applicable agreement, defaults on any of its credit facilities, fails to pay four quarterly dividends payable in arrears or if the Series C preferred shares are not redeemed at the option of the Company in whole by October 30, 2020, the dividend rate payable on the Series C preferred shares increases quarterly to a rate that is 1.25 times the dividend rate payable on the Series C preferred shares, subject to an aggregate maximum rate per annum of 25% prior to October 30, 2018 and 30% thereafter. The Series C preferred shares are not convertible into common shares and are not redeemable at the option of the holder. The first dividend of $ 1,479 on the Series C preferred shares was paid on January 30, 2014 (note 16(b)).
	On April 18, 2012, the Company completed an offering of 10,000,000 common shares at a price of $6.50 per share, for net proceeds of $62,329.
	Under the Company’s share-based incentive plan, 96,000 restricted share units (RSUs) were granted in 2013 at a weighted average fair value of $4.89 per share, all of which vested in 2013. There were no RSUs outstanding at the beginning or end of 2013. The Company issued 150,000 RSUs in 2012 at a weighted average grant date fair value of $3.75 per share. In 2011, the Company issued 12,000 RSUs at a weighted average grant date fair value of $9.36 per share. The total fair value of shares vested during the years ended December 31, 2013, 2012 and 2011 were $469, $974 and $987 respectively.
	As at December 31, 2013, under the existing share-based incentive plan approved by the shareholders a further 888,950 RSUs or other share-based awards may be issued in the future.
	Total compensation expense recognized in 2013 amounted to $469 ($730 in 2012 and $820 in 2011). As at December 31, 2013 and 2012 all granted RSUs were vested and the compensation expense recognized.

Accumulated_other_comprehensiv

Accumulated other comprehensive income/(loss)	12 Months Ended
	Dec. 31, 2013
Accumulated other comprehensive income/(loss) [Abstract]	'
Accumulated other comprehensive income/(loss)	'
	10.Accumulated other comprehensive income/(loss)
	In 2013, Accumulated other comprehensive income/(loss) decreased with unrealized gains from hedging financial instruments of $8,107 ($20,169 in 2012 and $17,265 in 2011) of which $7,230 ($17,996 in 2012 and $15,245 in 2011) related to unrealized gains on interest rate swaps, and $877 ($2,173 in 2012 and $2,020 in 2011) related to amortization of deferred loss on de-designated financial instruments. During 2013, unrealized losses on marketable securities was $79 (gain of $228, and $34 in 2012 and 2011, respectively), of which a gain of $89 ($95 in 2012 and nil in 2011) was realized and reclassified into earnings following the sale of the respective securities.

Earnings_per_Common_Share

Earnings per Common Share	12 Months Ended
	Dec. 31, 2013
Earnings per Common Share [Abstract]	'
Earnings per Common Share	'
	11.Earnings per Common Share
	The computation of basic earnings per share is based on the weighted average number of common shares outstanding during the year. The computation of diluted earnings per share assumes the foregoing and the exercise of all RSUs (Note 9) using the treasury stock method.
	Numerator
		2013	2012	2011
	Net loss attributable to Tsakos Energy Navigation Limited	-37,462	($49,263)	($89,496)
	Preferred share dividends	(3,676)	—	—
	Net loss attributable to common stock holders	($41,138)	-49,263	-89,496
	Denominator
	Weighted average common shares outstanding	56,698,955	53,301,039	46,118,534
	Basic and diluted loss per common share	($0.73)	($0.92)	$(1,94)
	For 2013 and 2012 there were no non-vested RSUs. In 2011 the RSUs are considered anti-dilutive due to the loss from continuing operations which have resulted in their exclusion from the computation of diluted earnings per common share.

Noncontrolling_Interest_In_Sub

Noncontrolling Interest In Subsidiary	12 Months Ended
	Dec. 31, 2013
Noncontrolling Interest in Subsidiary [Abstract]	'
Noncontrolling Interest in Subsidiary	'
	12.Noncontrolling Interest in Subsidiary
	In August 2006, the Company signed an agreement with Polaris Oil Shipping Inc. (Polaris), an affiliate of one of the Company’s major charterers, following which Polaris acquired 49% of Mare Success S.A., a previously wholly-owned subsidiary of the Holding Company. Mare Success S.A. is the holding-company of two Panamanian registered companies which own respectively the vessels Maya and Inca. The agreement became effective on November 30, 2006. Mare Success S.A. is fully consolidated in the accompanying financial statements. In the fourth quarter of 2013, Mare Success increased its paid-in capital by $20,408 of which $10,408 being the 51%, was contributed by the Company and $10,000 being the 49%, by Polaris. After the recapitalization, the shareholding of Mare Success S.A. remained at 51% for the Company and 49% for Polaris. There have been no transactions between Polaris and the Company since the incorporation of Mare Success S.A., whereas approximately 8.3% of the Company’s 2013 revenue was generated by the charterer affiliated to Polaris.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Taxes [Abstract]	'
Income Taxes	'
	13.Income Taxes
	Under the laws of the countries of the Company’s subsidiaries’ incorporation and/or vessels’ registration (Greece, Liberia, Marshall Islands, Panama, Bahamas), the companies are subject to registration and tonnage taxes, which have been included in the Vessel operating expenses. In addition, effective January 1, 2013 each foreign flagged vessel managed in Greece by Greek or foreign ship management companies is subject to Greek tonnage tax, under the laws of Greece. These tonnage taxes for 2013 amounted to $508, and have also been included under Vessel operating expenses in the accompanying Statement of Operations.
	The Company is not expected to be subject to United States Federal income tax on their gross income from the international operations of ships. In general, foreign persons operating ships to and from the United States are subject to United States Federal income tax of 4% of their United States source gross transportation income, which equals 50% of their gross income from transportation to or from the United States. The Company believes that it is exempt from United States Federal income tax on its United States source gross transportation income, as each vessel-operating subsidiary is organized in a foreign country that grants an equivalent exemption to corporations organized in the United States, and derives income from the international operation of ships and satisfies the stock ownership test as defined by the Internal Revenue Code and related regulations as a result of the Company’s stock being primarily and regularly traded on an established securities market in the United States. Under the regulations, a Company’s stock is considered to be regularly traded on an established securities market if (i) one or more classes of its stock representing 50% or more of its outstanding shares, by voting power and value, is listed on the market and is traded on the market, other than in minimal quantities, on at least 60 days during the taxable year; and (ii) the aggregate number of shares of stock traded during the taxable year is at least 10% of the average number of shares of the stock outstanding during the taxable year. Other requirements such as the substantiation and reporting requirements under the regulations also must be satisfied to qualify for the exemption from United States Federal income tax.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies [Abstract]	'
Commitments and Contingencies	'
	14.Commitments and Contingencies
	On December 10, 2013, the Company signed five new-building contracts with a major Korean owned yard in Romania for the construction of five aframax tankers at a cost of $51,220 per vessel and with expected deliveries between the second quarter of 2016 and the first quarter of 2017. As at December 31, 2013, the Company had under construction the newly signed five aframax crude oil carriers and one LNG carrier. The total contracted amount remaining to be paid for the six vessels under construction, plus the extra costs agreed as at December 31, 2013 was $426,543. Scheduled remaining payments as of December 31, 2013 were $ 82,660 payable in 2014, $ 51,692 in 2015, $ 261,459 in 2016 and $ 30,732 in 2017. In addition, under a contract to build a shuttle tanker with a Korean shipbuilding yard, agreed in 2012, an amount paid of $4,500 was paid in January 2013 as part of the first installment. However, the contract was suspended as the Company reconsidered the type of vessel to be constructed. A new proposal from the yard is being considered which includes the paid amount of $4,500, as being part of the initial payment. In case an agreement for an alternative project is not reached, the amount of $4,500 may be considered by the yard as a compensation against the Company’s default under the initial agreement and may claim additional compensation if the amount is found insufficient to cover shipyard’s losses.
	In the ordinary course of the shipping business, various claims and losses may arise from disputes with charterers, agents and other suppliers relating to the operations of the Company’s vessels. Management believes that all such matters are either adequately covered by insurance or are not expected to have a material adverse effect on the Company’s results from operations or financial condition.
	Charters-out
	The future minimum revenues, before reduction for brokerage commissions, expected to be recognized on non-cancelable time charters are as follows:
	Year	Amount
	2014	187,932
	2015	127,484
	2016	77,582
	2017 to 2028	494,319
	Minimum charter revenue	887,317
	These amounts do not assume any off-hire.

Financial_Instruments

Financial Instruments	12 Months Ended
	Dec. 31, 2013
Financial Instruments [Abstract]	'
Financial Instruments	'
	15.Financial Instruments
	(a)Interest rate risk: The Company is subject to interest rate risk associated with changing interest rates with respect to its variable interest rate term loans and credit facilities as described in Notes 7 and 8.
	(b)Concentration of credit risk: Financial Instruments that are subject to credit risk consist principally of cash, trade accounts receivable, marketable securities, investments and derivatives. The Company places its temporary cash investments, consisting mostly of deposits, primarily with high credit qualified financial institutions. The Company performs periodic evaluations of the relative credit standing of those financial institutions that are considered in the Company’s investment strategy. The Company limits its credit risk with accounts receivable by performing ongoing credit evaluations of its customers’ financial condition and generally does not require collateral for its accounts receivable and does not have any agreements to mitigate credit risk.
	The Company limits the exposure of non-performance by counterparties to derivative instruments by diversifying among counterparties with high credit ratings, and performing periodic evaluations of the relative credit standing of the counterparties.
	(c)Fair value: The carrying amounts reflected in the accompanying Consolidated Balance Sheet of cash and cash equivalents, restricted cash, marketable securities, trade receivables and accounts payable approximate their respective fair values due to the short maturity of these instruments. The fair value of long-term bank loans with variable interest rates approximate the recorded values, generally due to their variable interest rates. The present value of the future cash flows of the portion of one long-term bank loan with a fixed interest rate is estimated to be approximately $51,698 as compared to its carrying amount of $53,243 (Note 7). The fair value of the investment discussed in Note 3 equates to the amount that would be received by the Company in the event of sale of that investment.
	The fair values of the one long-term bank loan with a fixed interest rate, the interest rate swap agreements, bunker swap agreements discussed in Note 8 above and marketable securities discussed in Note 4 above are determined through Level 2 of the fair value hierarchy as defined in FASB guidance for Fair Value Measurements and are derived principally from or corroborated by observable market data, interest rates, yield curves and other items that allow value to be determined. The fair value of the investment is determined through Level 3 of the fair value hierarchy as defined in FASB guidance for Fair Value Measurements and is determined by the Company’s own data.
	The fair value of the impaired vessels Silia T, Triathlon, Delphi and Millennium discussed in Note 5 as at December 31, 2013 was determined through Level 2 of the fair value hierarchy, as defined in FASB guidance for Fair Value Measurements and was determined by management taking into consideration valuations from independent marine valuers based on observable data such as sale of comparable assets.
	The estimated fair values of the Company’s financial instruments, other than derivatives at December 31, 2013 and 2012 are as follows:
		2013		2012
		Carrying	Fair Value	Carrying	Fair Value
		Amount		Amount
	Financial assets/(liabilities)
	Cash and cash equivalents	162,237	162,237	144,297	144,297
	Restricted cash	9,527	9,527	16,192	16,192
	Marketable securities	-	-	1,664	1,664
	Investments	1,000	1,000	1,000	1,000
	Debt	1,380,298	1,378,753	1,442,427	1,441,108
	Tabular Disclosure of Derivatives Location
	Derivatives are recorded in the balance sheet on a net basis by counterparty when a legal right of setoff exists. The following tables present information with respect to the fair values of derivatives reflected in the balance sheet on a gross basis by transaction. The tables also present information with respect to gains and losses on derivative positions reflected in the Statement of Operations or in the balance sheet, as a component of Accumulated other comprehensive income/(loss).
			Asset Derivatives		Liability Derivatives
			December 31,	December 31,	December 31,	December 31,
			2013	2012	2013	2012
	Derivative	Balance Sheet Location	Fair Value	Fair Value	Fair Value	Fair Value
	Derivatives designated as hedging instruments
	Interest rate swaps	Current portion of financial instruments—Fair value	—	—	2,365	6,824
		FINANCIAL INSTRUMENTS—FAIR VALUE, net of current portion	1,401	—	2,445	4,471
	Subtotal		1,401	—	4,810	11,295
			Asset Derivatives		Liability Derivatives
			December 31,	December 31,	December 31,	December 31,
			2013	2012	2013	2012
	Derivative	Balance Sheet Location	Fair Value	Fair Value	Fair Value	Fair Value
	Derivatives not designated as hedging instruments
	Interest rate swaps	Current portion of financial instruments—Fair value	—	—	3,597	6,314
		FINANCIAL INSTRUMENTS—FAIR VALUE, net of current portion	—	—	1,582	4,890
	Bunker swaps	Current portion of financial instruments—Fair value	140	60	—	—
		FINANCIAL INSTRUMENTS—FAIR VALUE, net of current portion	37	45	—	—
	Subtotal		177	105	5,179	11,204
	Total derivatives		1,578	105	9,989	22,499
	Derivatives designated as Hedging Instruments-Net effect on the Statement of Comprehensive Income/(loss) and Statement of Operations
		Gain (Loss) Recognized in
		Accumulated Other Comprehensive
		Loss on Derivative (Effective Portion)
	Derivative		Amount
			2013	2012	2011
	Interest rate swaps		-3,338	-2,964	-9,624
	Total		-3,338	-2,964	-9,624
		Gain (Loss) Reclassified from
		Accumulated Other Comprehensive
		Loss into Income (Effective Portion)
		Location
	Derivative		Amount
			2013	2012	2011
	Interest rate swaps	Depreciation expense	-144	-122	-117
	Interest rate swaps	Interest and finance costs, net	-11,301	-23,010	-26,772
	Total		-11,445	-23,132	-26,889
	The accumulated loss from Derivatives designated as Hedging instruments recognized in Accumulated Other comprehensive Income/(Loss) as of December 31, 2013 and 2012 was $6,789 and $14,895 respectively.
	Derivatives not designated as Hedging Instruments – Net effect on the Statement of Operations
		Net Realized and Unrealized Gain	Amount
		(Loss) Recognized on Statement of
		Operations Location
	Derivative		2013	2012	2011
	Interest rate swaps	Interest and finance costs, net	1,012	-1,054	-5,352
	Bunker swaps	Interest and finance costs, net	223	783	4,260
Total		1,235	-271	-1,092
The following tables summarize the fair values for assets and liabilities measured on a recurring basis as of December 31, 2013 and 2012 using Level 2 inputs (significant other observable inputs):
Recurring measurements:	December 31,	December 31,
	2013	2012
Interest rate swaps	-8,588	-22,499
Marketable Securities	—	1,664
Bunker swaps	177	105
	-8,411	-20,730
The following tables present the fair values of items measured at fair value on a nonrecurring basis for the years ended December 31, 2013 and 2012, using Level 2 inputs (Note 5).
Nonrecurring basis	December 31, 2013	December 31,  2012
	Significant  Other	Unobservable
	Observable	Inputs
	Inputs	Assets/
	Assets/	(Liabilities)
	(Liabilities)	(Level 2)
	(Level 2)
Vessels	$95,250	$28,586
	$95,250	$28,586

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	16.Subsequent Events
	(a)On January 8, 2014, an amount of $25,610 was paid as the first installment for the construction of the five aframax tankers under construction.
	(b)On January 30, 2014, the Company paid $0.50 per share for its 8.00% Series B Preferred Shares and $0.73958 per share for its 8.875% Series C Preferred Shares.
	(c)On February 5, 2014, the Company completed an offering of 12,995,000 common shares, including 1,695,000 common shares issued upon the exercise in full by the underwriters of their option to purchase additional shares, at a price of $6.65 per share, for net proceeds of $82,678.
	(d)On February 26, 2014, the Company signed four new building contracts with a Korean owned yard in Romania for the construction of four aframax crude carriers. On March 4, 2014 the charterer exercised the option to charter those vessels for periods ranging from five to twelve years. On March 18, 2014, an amount of $20,688 was paid as the first installment for the construction of those vessels.
	(e)On March 17, 2014, the Company’s Board of Directors declared a quarterly dividend of $0.05 per share of common stock outstanding to be paid on May 22, 2014 to shareholders of record as of May 19, 2014.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Significant Accounting Policies [Abstract]	'
Basis of presentation and description of business	'
	(a) Basis of presentation and description of business: The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) and include the accounts of Tsakos Energy Navigation Limited (the “Holding Company”), and its wholly-owned and majority-owned subsidiaries (collectively, the “Company”). As at December 31, 2013, 2012 and 2011, the Holding Company consolidated two variable interest entities (“VIE”) for which it is deemed to be the primary beneficiary, i.e. it has a controlling financial interest in those entities. A VIE is an entity that in general does not have equity investors with voting rights or that has equity investors that do not provide sufficient financial resources for the entity to support its activities. A controlling financial interest in a VIE is present when a company has the power to direct the activities of a VIE that most significantly impact the entity’s economic performance and absorbs a majority of an entity’s expected losses, receives a majority of an entity’s expected residual returns, or both.
	All intercompany balances and transactions have been eliminated upon consolidation.
	The Company follows the provisions of Accounting Standard Codification (ASC) 220, “Comprehensive Income”, which requires separate presentation of certain transactions, which are recorded directly as components of stockholders’ equity. The Company presents Other Comprehensive Income / (Loss) in a separate statement according to ASU 2011-05.
	The Company owns and operates a fleet of crude and product oil carriers and one LNG carrier providing worldwide marine transportation services under long, medium or short-term charters.
Use of Estimates	'
	(b)Use of Estimates: The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts of assets and liabilities and expenses, reported in the consolidated financial statements and the accompanying notes. Actual results could differ from those estimates.
Foreign Currency Translation	'
	(c)Foreign Currency Translation: The functional currency of the Company is the U.S. Dollar because the Company’s vessels operate in international shipping markets in which the U.S. Dollar is utilized to transact most business. The accounting books of the Company are also maintained in U.S. Dollars. Transactions involving other currencies during the year are converted into U.S. Dollars using the exchange rates in effect at the time of the transactions. At the balance sheet dates, monetary assets and liabilities, which are denominated in other currencies, are translated into U.S. Dollars at the year-end exchange rates. Resulting gains or losses are separately reflected in the accompanying Consolidated Statements of Operations.
Cash and Cash Equivalents	'
	(d)Cash and Cash Equivalents: The Company classifies highly liquid investments such as time deposits and certificates of deposit with original maturities of three months or less as cash and cash equivalents. Cash deposits with certain banks that may only be used for special purposes (including loan repayments) are classified as Restricted cash.
Trade Accounts Receivable,Net	'
	(e)Trade Accounts Receivable, Net: Trade accounts receivable, net at each balance sheet date includes estimated recoveries from charterers for hire, freight and demurrage billings and revenue earned but not yet billed, net of an allowance for doubtful accounts (nil as of December 31, 2013 and 2012). The Company’s management at each balance sheet date reviews all outstanding invoices and provides allowances for receivables deemed uncollectible primarily based on the ageing of such balances and any amounts in dispute.
Inventories	'
	(f)Inventories: Inventories consist of bunkers, lubricants, victualling and stores and are stated at the lower of cost or market value. The cost is determined primarily by the first-in, first-out method.
Fixed Assets	'
	(g)Fixed Assets: Fixed assets consist of vessels. Vessels are stated at cost, less accumulated depreciation. The cost of vessels includes the contract price and pre-delivery costs incurred during the construction and delivery of new buildings, including capitalized interest, and expenses incurred upon acquisition of second-hand vessels. Subsequent expenditures for conversions and major improvements are capitalized when they appreciably extend the life, increase the earning capacity or improve the efficiency or safety of the vessels; otherwise they are charged to expense as incurred. Expenditures for routine repairs and maintenance are expensed as incurred.
	Depreciation is provided on the straight-line method based on the estimated remaining economic useful lives of the vessels, less an estimated residual value based on a scrap price. Effective October 1, 2012 and following management’s reassessment of the residual value of the vessels, the estimated scrap value per light weight ton (LWT) was increased to $0.39 from $0.30. Management’s estimate was based on the average demolition prices prevailing in the market during the last ten years for which historical data were available. The effect of this change in accounting estimate, which did not require retrospective application as per ASC 250 “Accounting Changes and Error Corrections”, was to decrease net loss for the year ended December 31, 2012 by $929 or $0.02 per weighted average number of shares, both basic and diluted. The decrease in depreciation expense for the year ended December 31, 2013 was approximately $3,787 or $0.07 per weighted average number of shares, both basic and diluted, based on the Company’s fleet existing at December 31, 2012. Economic useful lives are estimated at 25 years for crude and product oil carriers and 40 years for the LNG carrier from the date of original delivery from the shipyard.
Impairment of Vessels	'
	(h)Impairment of Vessels: The Company reviews vessels for impairment whenever events or changes in circumstances indicate that the carrying amount of a vessel may not be recoverable, such as during severe disruptions in global economic and market conditions. When such indicators are present, a vessel to be held and used is tested for recoverability by comparing the estimate of future undiscounted net operating cash flows expected to be generated by the use of the vessel over its remaining useful life and its eventual disposition to its carrying amount. Net operating cash flows are determined by applying various assumptions regarding the use or possible disposition of each vessel, future revenues net of commissions, operating expenses, scheduled dry-dockings, expected off-hire and scrap values, and taking into account historical revenue data and published forecasts on future world economic growth and inflation. Should the carrying value of the vessel exceed its estimated future undiscounted net operating cash flows, impairment is measured based on the excess of the carrying amount over the fair market value of the asset. The Company determines the fair value of its vessels based on management estimates and assumptions and by making use of available market data and taking into consideration third party valuations. The review of the carrying amounts in connection with the estimated recoverable amount for certain of the Company’s vessels as of December 31, 2013, December 31, 2012 and 2011 indicated an impairment charge (Note 5).
Reporting Assets held for sale	'
	(i)Reporting Assets held for sale: It is the Company’s policy to dispose of vessels when suitable opportunities occur and not necessarily to keep them until the end of their useful life. Long-lived assets are classified as held for sale when all applicable criteria enumerated under ASC 360“Property, Plant, and Equipment” are met and are measured at the lower of their carrying amount or fair value less cost to sell. These assets are not depreciated once they meet the criteria to be held for sale. At December 31, 2013 and 2012, there were no vessels held for sale.
Accounting for Special Survey and Dry-docking Costs	'
	(j)Accounting for Special Survey and Dry-docking Costs: The Company follows the deferral method of accounting for dry-docking and special survey costs whereby actual costs incurred are reported in Deferred Charges and are amortized on a straight-line basis over the period through the date the next dry-docking is scheduled to become due (approximately every five years during the first ten years of vessels’ life and every two and a half years within the following useful life of the vessels). Costs relating to routine repairs and maintenance are expensed as incurred. The unamortized portion of special survey and dry-docking costs for a vessel that is sold is included as part of the carrying amount of the vessel in determining the gain on sale of the vessel.
Loan Costs	'
	(k)Loan Costs: Costs incurred for obtaining new loans or refinancing existing loans are capitalized and included in deferred charges and amortized over the term of the respective loan, using the effective interest rate method. Any unamortized balance of costs relating to loans repaid or refinanced as debt extinguishments is expensed in the period the repayment or extinguishment is made.
Accounting for Revenue and Expenses	'
	(l)Accounting for Revenue and Expenses: Voyage revenues are generated from freight billings and time charter hire. Time charter revenue, including bare-boat hire, is recorded over the term of the charter as the service is provided. Revenues from voyage charters on the spot market or under contract of affreightment are recognized ratably from when a vessel becomes available for loading (discharge of the previous charterer’s cargo) to when the next charterer’s cargo is discharged, provided an agreed non-cancelable charter between the Company and the charterer is in existence, the charter rate is fixed or determinable and collectability is reasonably assured. Revenue under voyage charters will not be recognized until a charter has been agreed even if the vessel has discharged its previous cargo and is proceeding to an anticipated port of loading. Revenues from variable hire arrangements are recognized to the extent the variable amounts earned beyond an agreed fixed minimum hire are determinable at the reporting date and all other revenue recognition criteria are met. Revenue from hire arrangements with an escalation clause is recognized on a straight-line basis over the lease term unless another systematic and rational basis is more representative of the time pattern in which the vessel is employed. Vessel voyage and operating expenses and charter hire expense are expensed when incurred.
	Unearned revenue represents cash received prior to the year end for which related service has not been provided, primarily relating to charter hire paid in advance to be earned over the applicable charter period. The operating revenues and voyage expenses of vessels operating under a tanker pool are pooled and are allocated to the pool participants on a time charter equivalent basis, according to an agreed formula. Voyage revenues for 2013, 2012 and 2011 included revenues derived from significant charterers as follows (in percentages of total voyage revenues):
	Charterer	2013	2012	2011
	A	21%	17%	14%
	B	-	-	10%
	C	-	14%	-
	D	11%	-	-
Segment Reporting	'
	(m)Segment Reporting: The Company does not evaluate the operating results by type of vessel or by type of charter or by type of cargo. Although operating results may be identified by type of vessel, management, including the chief operating decision maker, reviews operating results primarily by revenue per day and operating results of the fleet. The Company operates a liquefied natural gas (LNG) carrier which meets the quantitative thresholds used to determine reportable segments. The chief operating decision maker does not review the operating results of this vessel separately, or makes any decisions about resources to be allocated to this vessel or assesses its performance separately, therefore, the LNG carrier does not constitute a separate reportable segment. The Company’s vessels operate on many trade routes throughout the world and, therefore, the provision of geographic information is considered impracticable by management. For the above reasons, the Company has determined that it operates in one reportable segment, the worldwide maritime transportation of liquid energy related products.
Derivative Financial Instruments	'
	(n)Derivative Financial Instruments: The Company regularly enters into interest rate swap contracts to manage its exposure to fluctuations of interest rates associated with its specific borrowings. Also, the Company enters into bunker swap contracts to manage its exposure to fluctuations of bunker prices associated with the consumption of bunkers by its vessels. Interest rate and bunker price differentials paid or received under these swap agreements are recognized as part of Interest and finance costs, net. All derivatives are recognized in the consolidated financial statements at their fair value. On the inception date of the derivative contract, the Company evaluates the derivative as an accounting hedge of the variability of cash flow to be paid of a forecasted transaction (“cash flow” hedge). Changes in the fair value of a derivative that is qualified, designated and highly effective as a cash flow hedge are recorded in other comprehensive income/(loss) until earnings are affected by the forecasted transaction. Changes in the fair value of undesignated derivative instruments and the ineffective portion of designated derivative instruments are reported in earnings in the period in which those fair value changes occur. Realized gains or losses on early termination of undesignated derivative instruments are also classified in earnings in the period of termination of the respective derivative instrument.
	The Company formally documents all relationships between hedging instruments and hedged items, as well as the risk-management objective and strategy for undertaking various hedge transactions. This process includes linking all derivatives that are designated as cash flow hedges of the variable cash flows of a forecasted transaction to a specific forecasted transaction. The Company also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivatives that are used in hedging transactions are highly effective in offsetting changes in cash flow of hedged items. When it is determined that a derivative is not highly effective as a hedge or that it has ceased to be a highly effective hedge, the Company discontinues hedge accounting prospectively. In accordance with ASC 815 “Derivatives and Hedging”, the Company may prospectively discontinue the hedge accounting for an existing hedge if the applicable criteria are no longer met, the derivative instrument expires, is sold, terminated or exercised or if the Company removes the designation of the respective cash flow hedge. In those circumstances, the net gain or loss remains in accumulated other comprehensive income / (loss) and is reclassified into earnings in the same period or periods during which the hedged forecasted transaction affects earnings, unless the forecasted transaction is no longer probable in which case the net gain or loss is reclassified into earnings immediately.
Fair Value Measurements	'
	(o)Fair Value Measurements: The Company follows the provisions of ASC 820, “Fair Value Measurements and Disclosures” which defines, and provides guidance as to the measurement of fair value. ASC 820 applies when assets or liabilities in the financial statements are to be measured at fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants (Note 15). Upon issuance of guidance on the fair value option in 2007, the Company elected not to report the then existing financial assets or liabilities at fair value that were not already reported as such.
Accounting for Leases	'
	(p)Accounting for Leases: Leases of assets under which substantially all the risks and rewards of ownership are effectively retained by the lessor are classified as operating leases. Lease payments under an operating lease are recognized as an expense on a straight-line method over the lease term. The Company held no operating leases at December 31, 2013.
Stock Based Compensation	'
	(q)Stock Based Compensation: The Company has a share based incentive plan that covers directors and officers of the Company and employees of the related companies. Awards granted are valued at fair value and compensation cost is recognized on a straight line basis, net of estimated forfeitures, over the requisite service period of each award. The fair value of restricted stock issued to crew members, directors and officers of the Company at the grant date is equal to the closing stock price on that date and is amortized over the applicable vesting period using the straight-line method. The fair value of restricted stock issued to non-employees is equal to the closing stock price at the grant date adjusted by the closing stock price at each reporting date and is amortized over the applicable performance period (Note 9).
Marketable Securities	'
	(r)Marketable Securities: The Company from March 2011 until their disposal in July 2013 had investments in marketable securities that had readily determinable fair values and were classified as available for sale. Such investments were measured subsequently at fair value in the statement of financial position. Unrealized holding gains and losses for available for sale securities were excluded from earnings and were reported in Accumulated other comprehensive income/(loss) until realized (Note 4).
Recent Accounting Pronouncements	'
	(s)Recent Accounting Pronouncements: There are no recent accounting pronouncements issued in 2013, whose adoption would have a material impact on the Company’s Consolidated Financial Statements in the current year, or expected to have a material impact on future years.

Significant_Accounting_Policie2

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2013
Significant Accounting Policies [Abstract]	'
Schedule of revenue percentage by major customer	'
	Charterer	2013	2012	2011
	A	21%	17%	14%
	B	-	-	10%
	C	-	14%	-
	D	11%	-	-

Transactions_with_Related_Part1

Transactions with Related Parties (Tables)	12 Months Ended
	Dec. 31, 2013
Transactions with Related Parties [Abstract]	'
Related party transactions disclosure	'
		2013	2012	2011
	Tsakos Shipping and Trading S.A. (commissions)	5,219	5,304	5,461
	Tsakos Energy Management Limited (management fees)	15,487	15,587	15,298
	Tsakos Columbia Shipmanagement S.A.	1,621	1,280	1,237
	Argosy Insurance Company Limited	9,129	9,701	9,933
	AirMania Travel S.A.	4,810	3,661	2,129
	Total expenses with related parties	36,266	35,533	34,058
Related party transactions balances	'
		December 31,
	Due from related parties	2013	2012
	Tsakos Columbia Shipmanagement Ltd	1,084	1,561
	Total due from related parties	1,084	1,561
	Due to related parties
	Tsakos Shipping and Trading S.A.	555	1,110
	Tsakos Energy Management Limited	92	53
	Argosy Insurance Company Limited	6,008	1,209
	AirMania Travel S.A.	275	222
	Total due to related parties	6,930	2,594
Related party - future management fees	'
	Year	Amount
	2014	16,971
	2015	16,971
	2016	16,973
	2017	17,251
	2018	17,272
	2019 to 2023	77,724
		163,162

LongTerm_Debt_Tables

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2013
Long-Term Debt [Abstract]	'
Debt disclosure	'
	Facility	2013	2012
	(a) Credit facilities	808,218	939,514
	(b) Term bank loans	572,080	502,913
	Total	1,380,298	1,442,427
	Less – current portion	-126,361	-186,651
	Long-term portion	1,253,937	1,255,776
Schedule of weighted-average interest rate	'
	Year ended December 31, 2013	2.49%
	Year ended December 31, 2012	1.87%
	Year ended December 31, 2011	1.66%
Schedule of Debt	'
	Loan	Origination	Original	Balance at	New	Repaid	Balance at
		Date	Amount	January 1,	Loans		December 31,
				2013			2013
	Credit facility1	2005	250,000	34,855	—	34,855	—
	Credit facility	2005	220,000	134,225	—	13,135	121,090
	Credit facility	2006	275,000	125,092	—	11,823	113,270
	Credit facility2	2004	179,384	112,356	—	10,555	101,800
	Credit facility3	2005	220,000	92,550	—	26,952	65,598
	Credit facility	2006	371,010	251,010	—	20,000	231,010
	10-year term loan	2004	71,250	32,032	—	3,125	28,907
	Credit facility	2006	70,000	35,625	—	4,375	31,250
	Credit facility	2007	120,000	92,500	—	5,000	87,500
	10-year term loan	2007	88,350	66,270	—	5,520	60,750
	Credit facility	2007	82,000	61,300	—	4,600	56,700
	10-year term loan	2009	38,600	29,046	—	2,235	26,812
	8-year term loan	2009	40,000	30,400	—	2,900	27,500
	12 year term loan	2009	40,000	33,750	—	2,500	31,250
	10-year term loan	2010	39,000	32,500	—	2,600	29,900
	7-year term loan	2010	70,000	60,720	—	4,640	56,080
	10-year term loan	2010	43,924	37,489	—	3,218	34,271
	9-year term loan	2010	42,100	36,900	—	2,600	34,300
	10-year term loan	2011	48,000	43,200	—	3,200	40,000
	9-year term loan	2011	48,650	45,407	—	3,243	42,163
	8-year term loan	2012	73,600	27,600	46,000	2,300	71,300
	8-year term loan	2011	73,600	27,600	46,000	2,453	71,147
	7-year term loan	2013	18,000	—	18,000	300	17,700
	Total			1,442,427	110,000	172,129	1,380,298
Debt principal payments	'
	Year	Amount
	2014	120,495
	2015	174,842
	2016	270,406
	2017	182,805
	2018	297,431
	2019 and thereafter	334,319
		1,380,298

Interest_and_Finance_Costs_net1

Interest and Finance Costs, net (Tables)	12 Months Ended
	Dec. 31, 2013
Interest and Finance Costs, net [Abstract]	'
Interest and finance costs, net	'
		2013	2012	2011
	Interest expense	41,741	49,701	51,720
	Less: Interest capitalized	-1,945	-1,758	-2,532
	Interest expense, net	39,796	47,943	49,188
	Interest swap cash settlements non-hedging	5,012	8,043	8,977
	Bunkers swap cash settlements	-151	-2,433	-6,382
	Amortization of loan fees	1,101	946	995
	Bank charges	379	243	277
	Amortization of deferred loss on termination of financial instruments	877	2,173	2,020
	Change in fair value of non-hedging financial instruments	-6,097	-5,339	-1,504
	Net total	40,917	51,576	53,571

Earnings_per_Common_Share_Tabl

Earnings per Common Share (Tables)	12 Months Ended
	Dec. 31, 2013
Earnings per Common Share [Abstract]	'
Earnings per common share	'
	Numerator
		2013	2012	2011
	Net loss attributable to Tsakos Energy Navigation Limited	-37,462	($49,263)	($89,496)
	Preferred share dividends	(3,676)	—	—
	Net loss attributable to common stock holders	($41,138)	-49,263	-89,496
	Denominator
	Weighted average common shares outstanding	56,698,955	53,301,039	46,118,534
	Basic and diluted loss per common share	($0.73)	($0.92)	$(1,94)

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Charters-out [Abstract]	'
Minimum future charter revenue	'
	Year	Amount
	2014	187,932
	2015	127,484
	2016	77,582
	2017 to 2028	494,319
	Minimum charter revenue	887,317

Financial_Instruments_Tables

Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2013
Financial Instruments [Abstract]	'
Schedule of Carrying Values and estimated Fair Values of financial instruments	'
		2013		2012
		Carrying	Fair Value	Carrying	Fair Value
		Amount		Amount
	Financial assets/(liabilities)
	Cash and cash equivalents	162,237	162,237	144,297	144,297
	Restricted cash	9,527	9,527	16,192	16,192
	Marketable securities	-	-	1,664	1,664
	Investments	1,000	1,000	1,000	1,000
	Debt	1,380,298	1,378,753	1,442,427	1,441,108
Schedule of Derivative Instruments - Statements of financial position location	'
			Asset Derivatives		Liability Derivatives
			December 31,	December 31,	December 31,	December 31,
			2013	2012	2013	2012
	Derivative	Balance Sheet Location	Fair Value	Fair Value	Fair Value	Fair Value
	Derivatives designated as hedging instruments
	Interest rate swaps	Current portion of financial instruments—Fair value	—	—	2,365	6,824
		FINANCIAL INSTRUMENTS—FAIR VALUE, net of current portion	1,401	—	2,445	4,471
	Subtotal		1,401	—	4,810	11,295
			Asset Derivatives		Liability Derivatives
			December 31,	December 31,	December 31,	December 31,
			2013	2012	2013	2012
	Derivative	Balance Sheet Location	Fair Value	Fair Value	Fair Value	Fair Value
	Derivatives not designated as hedging instruments
	Interest rate swaps	Current portion of financial instruments—Fair value	—	—	3,597	6,314
		FINANCIAL INSTRUMENTS—FAIR VALUE, net of current portion	—	—	1,582	4,890
	Bunker swaps	Current portion of financial instruments—Fair value	140	60	—	—
		FINANCIAL INSTRUMENTS—FAIR VALUE, net of current portion	37	45	—	—
	Subtotal		177	105	5,179	11,204
	Total derivatives		1,578	105	9,989	22,499
Schedule of Cash Flow Hedges - Gain/(Loss) Recognized In Accumulated Other Comprehensive Loss on Derivative	'
		Gain (Loss) Recognized in
		Accumulated Other Comprehensive
		Loss on Derivative (Effective Portion)
	Derivative		Amount
			2013	2012	2011
	Interest rate swaps		-3,338	-2,964	-9,624
	Total		-3,338	-2,964	-9,624
Schedule of Cash Flow Hedges - Gain/(Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)	'
		Gain (Loss) Reclassified from
		Accumulated Other Comprehensive
		Loss into Income (Effective Portion)
		Location
	Derivative		Amount
			2013	2012	2011
	Interest rate swaps	Depreciation expense	-144	-122	-117
	Interest rate swaps	Interest and finance costs, net	-11,301	-23,010	-26,772
	Total		-11,445	-23,132	-26,889
Schedule of Derivatives Not Designated As Hedging Instruments - Net Realized and Unrealized Gain (Loss) Recognized on Statement Of Operations	'
		Net Realized and Unrealized Gain	Amount
		(Loss) Recognized on Statement of
		Operations Location
	Derivative		2013	2012	2011
	Interest rate swaps	Interest and finance costs, net	1,012	-1,054	-5,352
	Bunker swaps	Interest and finance costs, net	223	783	4,260
	Total		1,235	-271	-1,092
Schedule of Fair Value Assets and Liabilities measured on Recurring basis	'
	Recurring measurements:	December 31,	December 31,
		2013	2012
	Interest rate swaps	-8,588	-22,499
	Marketable Securities	—	1,664
	Bunker swaps	177	105
		-8,411	-20,730
Schedule of Fair Value Items measured on Nonrecurring basis	'
	Nonrecurring basis	December 31, 2013	December 31,  2012
		Significant  Other	Unobservable
		Observable	Inputs
		Inputs	Assets/
		Assets/	(Liabilities)
		(Liabilities)	(Level 2)
		(Level 2)
	Vessels	$95,250	$28,586
		$95,250	$28,586

Significant_Accounting_Policie3

Significant Accounting Policies (Table) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Charterer A	'	'	'
Major customer percentage	21.00%	17.00%	14.00%
Charterer B	'	'	'
Major customer percentage	'	'	10.00%
Charterer C	'	'	'
Major customer percentage	'	14.00%	'
Charterer D	'	'	'
Major customer percentage	11.00%	'	'

Significant_Accounting_Policie4

Significant Accounting Policies (Details) (USD $)	9 Months Ended	12 Months Ended		15 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013
Allowance for doubtful accounts receivable	'	$0	$0	$0
Vessels Scrap Value Per Lightweight Ton	'$0.30	'	'	'$0.39
Change in accounting estimate financial effect	'	'	'	'
			The effect of this change in accounting estimate, which did not require retrospective application as per ASC 250 "Accounting Changes and Error Corrections", was to decrease net loss for the year ended December 31, 2012 by $929 or $0.02 per weighted average number of shares , both basic and diluted.
Change in accounting estimate effect on depreciation	'	$3,787	'	'
Change in accounting estimate effect on depreciation per weighted average number of shares	'	$0.07	'	'
Vessels depreciation method	'	'	'	'
		straight-line basis
Crude and Product Oil Carriers	'	'	'	'
Useful Lives	'	'25 years	'	'
LNG Carrier	'	'	'	'
Useful Lives	'	'40 years	'	'

Transactions_with_Related_Part2

Transactions with Related Parties - Statement Of Income (Table) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]	'	'	'
Tsakos Shipping and Trading S.A. (commissions)	$16,019	$12,215	$14,290
Tsakos Energy Management Limited (management fees)	15,896	15,887	15,598
Total expenses with related parties	36,266	35,533	34,058
Tsakos Shipping and Trading S.A.	'	'	'
Related Party Transaction [Line Items]	'	'	'
Tsakos Shipping and Trading S.A. (commissions)	5,219	5,304	5,461
Tsakos Energy Management Limited	'	'	'
Related Party Transaction [Line Items]	'	'	'
Tsakos Energy Management Limited (management fees)	15,487	15,587	15,298
Tsakos Columbia Shipmanagement S.A.	'	'	'
Related Party Transaction [Line Items]	'	'	'
Tsakos Columbia Shipmanagement S.A.	1,621	1,280	1,237
Argosy Insurance Company Limited	'	'	'
Related Party Transaction [Line Items]	'	'	'
Argosy Insurance Company Limited	9,129	9,701	9,933
AirMania Travel S.A.	'	'	'
Related Party Transaction [Line Items]	'	'	'
AirMania Travel S.A.	$4,810	$3,661	$2,129

Transactions_with_Related_Part3

Transactions with Related Parties - Balance Sheet (Table) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Related Party Transaction [Line Items]	'	'
Due from related parties	$1,084	$1,561
Due to related parties	6,930	2,594
Tsakos Columbia Shipmanagement Ltd	'	'
Related Party Transaction [Line Items]	'	'
Due from related parties	1,084	1,561
Tsakos Shipping and Trading S.A.	'	'
Related Party Transaction [Line Items]	'	'
Due to related parties	555	1,110
Tsakos Energy Management Limited	'	'
Related Party Transaction [Line Items]	'	'
Due to related parties	92	53
Argosy Insurance Company Limited	'	'
Related Party Transaction [Line Items]	'	'
Due to related parties	6,008	1,209
AirMania Travel S.A.	'	'
Related Party Transaction [Line Items]	'	'
Due to related parties	$275	$222

Transactions_with_Related_Part4

Transactions with Related Parties - Management Fees (Tables) (Details) (Management Agreement with Tsakos Energy Management Limited, USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Management Agreement with Tsakos Energy Management Limited	'
Related Party Transaction [Line Items]	'
2014	$16,971
2015	16,971
2016	16,973
2017	17,251
2018	17,272
2019 to 2023	77,724
Total	$163,162

Transactions_with_Related_Part5

Transactions with Related Parties - Accrued Liabilities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Tsakos Shipping and Trading S.A.	'	'
Related Party Transaction [Line Items]	'	'
Accrued liabilities	$319	$559
Argosy Insurance Limited	'	'
Related Party Transaction [Line Items]	'	'
Accrued liabilities	$356	$329

Transactions_with_Related_Part6

Transactions with Related Parties - Tsakos Energy Management Limited (Details) (USD $)

12 Months Ended

24 Months Ended

12 Months Ended

24 Months Ended

12 Months Ended

15 Months Ended

21 Months Ended

15 Months Ended

21 Months Ended

15 Months Ended

21 Months Ended

6 Months Ended

3 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Mar. 31, 2012

Dec. 31, 2013

Mar. 31, 2012

Dec. 31, 2013

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Tsakos Energy Management Limited

Operating vessels

Operating vessels

Chartered in/out or on a bare-boat basis

Chartered in/out or on a bare-boat basis

DP2 Shuttle Tankers

Capital raising offerings

LNG Carriers

LNG Carriers

LNG Carriers

LNG Carriers

LNG Carriers

LNG Carriers

VLCC Millennium

VLCC Millennium

Suezmax Eurochampion 2004

Suezmax Eurochampion 2004

Tsakos Energy Management Limited

Tsakos Energy Management Limited

Third Party Manager

Third Party Manager

Third Party Manager

Third Party Manager

Related Party Transaction [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Euro appreciated against dollar percentage

'

'

'

10.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Yearly increase basis

'

'

'

'12 month Euribor

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Monthly management fees

'

'

'

'

$27,000

$27,500

$20,000

$20,400

$35,000

'

$32,000

$35,000

$7,000

$10,000

$25,000

$25,000

$27,500

$13,700

$27,500

$12,000

Management incentive award

0

0

0

'

'

'

'

'

'

500,000

'

'

'

'

'

'

'

'

'

'

Years required for cancellation written notice for agreement

'

'

'

'one year notice

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Days required for cancellation written notice for agreement

'

'

'

'ten days notice

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Compensation to Management company after contract termination with Directors

'

'

'

145,291,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Supervisory services per month, per vessel

20,400

20,400

20,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Supervisory services

$492,000

$612,000

$588,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Transactions_with_Related_Part7

Transactions with Related Parties - Tsakos Shipping and Trading S.A. (Details) (Tsakos Shipping and Trading S.A., USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Tsakos Shipping and Trading S.A.	'	'	'
Related Party Transaction [Line Items]	'	'	'
Chartering commission	1.25%	'	'
Brokerage commission	'	1.00%	1.00%
Charge fee	$200	'	'

Longterm_Investments_Details

Long-term Investments (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Long-term investments [Abstract]	'	'
Common shares held	125,000	125,000
Long term investments	$1,000	$1,000

Marketable_Securities_Details

Marketable Securities (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Marketable securities [Abstract]	'	'	'	'
Marketable Securities	$0	$1,664	'	$2,500
Proceeds from sale of marketable securities	1,585	1,098	0	'
Gain on sale of marketable securities	89	95	0	'
Net gain on marketable securities included in accumulated OCI	'	$133	'	'

Vessels_Acquisitions_and_Sales

Vessels - Acquisitions and Sales (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Vessels [Line Items]	'	'	'
Cash paid for vessel acquisitions	$108,840	$2,454	$71,205
Gain (loss) on sale of vessels	0	-1,879	5,001
DP2 suezmax shuttle tankers Rio 2016 and Brasil 2014	'	'	'
Vessels [Line Items]	'	'	'
Acquisition of newly constructed vessels	203,908	'	'
Cash paid for vessel acquisitions	105,763	'	'
Suezmaxes Spyros K and Dimitris P	'	'	'
Vessels [Line Items]	'	'	'
Acquisition of newly constructed vessels	'	'	148,526
Cash paid for vessel acquisitions	'	'	66,643
VLCCs La Madrina and La Prudencia	'	'	'
Vessels [Line Items]	'	'	'
Net proceeds from sale of vessel	'	40,219	'
Gain (loss) on sale of vessels	'	-1,879	'
Aframax tanker Opal Queen	'	'	'
Vessels [Line Items]	'	'	'
Net proceeds from sale of vessel	'	'	32,753
Gain (loss) on sale of vessels	'	'	5,802
Aframax tanker Vergina II	'	'	'
Vessels [Line Items]	'	'	'
Net proceeds from sale of vessel	'	'	9,702
Gain (loss) on sale of vessels	'	'	($801)

Vessels_Impairment_Details

Vessels - Impairment (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Vessels [Line Items]	'	'	'
Carrying value of assets	$2,173,068	$2,088,358	'
Vessel impairment charge	28,290	13,567	39,434
Silia T, Triathlon, Delphi and Millennium vessels - Carrying value prior to impairment	'	'	'
Vessels [Line Items]	'	'	'
Carrying value of assets	123,540	'	'
Silia T, Triathlon, Delphi and Millennium vessels - Carrying value after impairment	'	'	'
Vessels [Line Items]	'	'	'
Carrying value of assets	95,250	'	'
Silia T, Triathlon, Delphi and Millennium vessels	'	'	'
Vessels [Line Items]	'	'	'
Vessel impairment charge	28,290	'	'
VLCC Millennium	'	'	'
Vessels [Line Items]	'	'	'
Vessel impairment charge	'	13,567	'
VLCCs La Madrina and La Prudencia	'	'	'
Vessels [Line Items]	'	'	'
Vessel impairment charge (for vessels classified as held for sale)	'	'	$39,434

Deferred_Charges_Details

Deferred Charges (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deferred Charges [Abstract]	'	'
Deferred charges consisted of dry-docking and special survey costs	$12,724	$13,327
Loan fees net of accumulated amortization	$4,607	$4,641

LongTerm_Debt_Table_Details

Long-Term Debt (Table) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Jan. 17, 2012
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'	'	'
Credit Facilities	$808,218	$939,514	$28,358
Term bank loans	572,080	502,913	'
Total	1,380,298	1,442,427	'
Less - current portion	-126,361	-186,651	'
Long-term portion	$1,253,937	$1,255,776	'

LongTerm_Debt_WeightedAverage_

Long-Term Debt - Weighted-Average Interest Rates (Table) (Details)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt Disclosure [Abstract]	'	'	'
Weighted average interest rates on the executed loans	2.49%	1.87%	1.66%

LongTerm_Debt_Loan_Movements_T

Long-Term Debt - Loan Movements (Table) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Debt Instrument [Line Items]	'
Balance at January 1, 2013	$1,442,427
New Loans	110,000
Repaid	172,129
Balance at December 31, 2013	1,380,298
Credit facility	'
Debt Instrument [Line Items]	'
Origination Date	'2005
Original Amount	250,000
Balance at January 1, 2013	34,855
New Loans	0
Repaid	34,855
Balance at December 31, 2013	0
Credit facility	'
Debt Instrument [Line Items]	'
Origination Date	'2005
Original Amount	220,000
Balance at January 1, 2013	134,225
New Loans	0
Repaid	13,135
Balance at December 31, 2013	121,090
Credit facility	'
Debt Instrument [Line Items]	'
Origination Date	'2006
Original Amount	275,000
Balance at January 1, 2013	125,092
New Loans	0
Repaid	11,823
Balance at December 31, 2013	113,270
Credit facility	'
Debt Instrument [Line Items]	'
Origination Date	'2004
Original Amount	179,384
Balance at January 1, 2013	112,356
New Loans	0
Repaid	10,555
Balance at December 31, 2013	101,800
Credit facility	'
Debt Instrument [Line Items]	'
Origination Date	'2005
Original Amount	220,000
Balance at January 1, 2013	92,550
New Loans	0
Repaid	26,952
Balance at December 31, 2013	65,598
Credit facility	'
Debt Instrument [Line Items]	'
Origination Date	'2006
Original Amount	371,010
Balance at January 1, 2013	251,010
New Loans	0
Repaid	20,000
Balance at December 31, 2013	231,010
10-year term loan	'
Debt Instrument [Line Items]	'
Origination Date	'2004
Original Amount	71,250
Balance at January 1, 2013	32,032
New Loans	0
Repaid	3,125
Balance at December 31, 2013	28,907
Credit facility	'
Debt Instrument [Line Items]	'
Origination Date	'2006
Original Amount	70,000
Balance at January 1, 2013	35,625
New Loans	0
Repaid	4,375
Balance at December 31, 2013	31,250
Credit facility	'
Debt Instrument [Line Items]	'
Origination Date	'2007
Original Amount	120,000
Balance at January 1, 2013	92,500
New Loans	0
Repaid	5,000
Balance at December 31, 2013	87,500
10-year term loan	'
Debt Instrument [Line Items]	'
Origination Date	'2007
Original Amount	88,350
Balance at January 1, 2013	66,270
New Loans	0
Repaid	5,520
Balance at December 31, 2013	60,750
Credit facility	'
Debt Instrument [Line Items]	'
Origination Date	'2007
Original Amount	82,000
Balance at January 1, 2013	61,300
New Loans	0
Repaid	4,600
Balance at December 31, 2013	56,700
10-year term loan	'
Debt Instrument [Line Items]	'
Origination Date	'2009
Original Amount	38,600
Balance at January 1, 2013	29,046
New Loans	0
Repaid	2,235
Balance at December 31, 2013	26,812
8-year term loan	'
Debt Instrument [Line Items]	'
Origination Date	'2009
Original Amount	40,000
Balance at January 1, 2013	30,400
New Loans	0
Repaid	2,900
Balance at December 31, 2013	27,500
12 year term loan	'
Debt Instrument [Line Items]	'
Origination Date	'2009
Original Amount	40,000
Balance at January 1, 2013	33,750
New Loans	0
Repaid	2,500
Balance at December 31, 2013	31,250
10-year term loan	'
Debt Instrument [Line Items]	'
Origination Date	'2010
Original Amount	39,000
Balance at January 1, 2013	32,500
New Loans	0
Repaid	2,600
Balance at December 31, 2013	29,900
7-year term loan	'
Debt Instrument [Line Items]	'
Origination Date	'2010
Original Amount	70,000
Balance at January 1, 2013	60,720
New Loans	0
Repaid	4,640
Balance at December 31, 2013	56,080
10-year term loan	'
Debt Instrument [Line Items]	'
Origination Date	'2010
Original Amount	43,924
Balance at January 1, 2013	37,489
New Loans	0
Repaid	3,218
Balance at December 31, 2013	34,271
9-year term loan	'
Debt Instrument [Line Items]	'
Origination Date	'2010
Original Amount	42,100
Balance at January 1, 2013	36,900
New Loans	0
Repaid	2,600
Balance at December 31, 2013	34,300
10-year term loan	'
Debt Instrument [Line Items]	'
Origination Date	'2011
Original Amount	48,000
Balance at January 1, 2013	43,200
New Loans	0
Repaid	3,200
Balance at December 31, 2013	40,000
9-year term loan	'
Debt Instrument [Line Items]	'
Origination Date	'2011
Original Amount	48,650
Balance at January 1, 2013	45,407
New Loans	0
Repaid	3,243
Balance at December 31, 2013	42,163
8-year term loan	'
Debt Instrument [Line Items]	'
Origination Date	'2012
Original Amount	73,600
Balance at January 1, 2013	27,600
New Loans	46,000
Repaid	2,300
Balance at December 31, 2013	71,300
8-year term loan	'
Debt Instrument [Line Items]	'
Origination Date	'2011
Original Amount	73,600
Balance at January 1, 2013	27,600
New Loans	46,000
Repaid	2,453
Balance at December 31, 2013	71,147
7-year term loan	'
Debt Instrument [Line Items]	'
Origination Date	'2013
Original Amount	18,000
Balance at January 1, 2013	0
New Loans	18,000
Repaid	300
Balance at December 31, 2013	$17,700

LongTerm_Debt_Principal_Paymen

Long-Term Debt - Principal Payments (Table) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Principal Payments [Abstract]	'	'
2014	$120,495	'
2015	174,842	'
2016	270,406	'
2017	182,805	'
2018	297,431	'
2019 and thereafter	334,319	'
Total	$1,380,298	$1,442,427

LongTerm_Debt_Credit_Facilitie

Long-Term Debt - Credit Facilities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Jan. 17, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified					Revolving Credit Facility	Revolving Credit Facility
Number of open reducing credit facilities	6	'	'	'	'	'
Number of credit facilities with reducing revolving credit component and term bank loan component	2	'	'	'	'	'
Unused amount	$0	$0	'	$28,358	'	'
Credit facility amount drawn down	$808,218	$939,514	$28,358	'	'	'
Libor plus spread minimum	'	'	'	'	1.48%	0.81%
Libor plus spread maximum	'	'	'	'	5.69%	5.19%

LongTerm_Debt_Term_Bank_Loans_

Long-Term Debt - Term Bank Loans (Details) (USD $)	12 Months Ended		12 Months Ended		0 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2013	Apr. 22, 2013	Mar. 06, 2013	Sep. 11, 2013	Sep. 11, 2013	Sep. 11, 2013
			All Company's term bank loans	La Madrina	La Prudencia	DP2 suezmax shuttle tankers Rio 2016 and Brasil 2014	DP2 suezmax shuttle tankers Rio 2016 and Brasil 2014	Aframax tanker Sakura Princess	Aframax tanker Sakura Princess	Aframax tanker Sakura Princess
									First six installments	Remaining twenty installments
Outstanding term loan balance, with balloon payments due at maturity between October 2016 and April 2022	$572,080	$502,913	'	'	'	'	'	'	'	'
Loan facility amount draw down	110,000	'	'	'	'	46,000	46,000	18,000	'	'
Debt periodic payment	'	'	'	'	'	'	'	'28 quarterly installments	'	'
Debt periodic payment amount	'	'	'	'	'	'	'	'	300	405
Debt ballon payment	'	'	'	'	'	'	'	7,500	'	'
Libor plus spread minimum	'	'	1.85%	'	'	'	'	'	'	'
Libor plus spread maximum	'	'	3.24%	'	'	'	'	'	'	'
Prepayment of loan	172,129	'	'	23,600	20,352	'	'	'	'	'
Fixed interest rate portion	$53,243	'	'	'	'	'	'	'	'	'

LongTerm_Debt_Covenants_Detail

Long-Term Debt - Covenants (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Long-Term Debt [Line Items]	'	'	'	'
Cash and cash equivalents	$162,237	$144,297	$175,708	$276,637
Debt Instrument Covenant Description	'	'	'	'
	The loan agreements include, among other covenants, covenants requiring the Company to obtain the lenders’ prior consent in order to incur or issue any financial indebtedness, additional borrowings, pay dividends in an amount more than 50% of cumulative net income (as defined in the related agreements), sell vessels and assets, and change the beneficial ownership or management of the vessels. Also, the covenants require the Company to maintain a minimum liquidity, not legally restricted, of $78,144 ($99,375 in 2012 and $92,188 in 2011 respectively), a minimum hull value in connection with the vessels’ outstanding loans, insurance coverage of the vessels against all customary risks and maintenance of operating bank accounts with minimum balances.
Debt Instrument Covenant Compliance	'	'	'	'
	As at December 31, 2013 and 2012, the Company was in non-compliance with minimum value-to-loan ratios contained in certain of its debt agreements. In case of non-compliance with minimum value-to-loan ratios these agreements include terms according to which the Company may be required to prepay indebtedness in the form of cash or provide additional security. Effective since December 31, 2012 and for a period up to, and including, June 30, 2014, certain of the Company’s lenders formally waived their rights resulting from the aforementioned non-compliance of the value-to-loan covenant, while the remainder did not seek immediate remedial action
	As at December 31, 2012, the Company was in non-compliance with the leverage ratio required by its loans. In this respect, the Company entered into amendatory agreements with its lenders which waive the non-compliance of the leverage ratio covenant referred to the above by increasing the relevant ratio for the period from December 31, 2012 through July 1, 2014 from 70% to 80%, establishing in this repsect compliance as at December 31, 2013 and 2012. Following these amendatory agreements and because management concluded that it is not probable that the amended ratio will fail to be met at any next measurement dates within the following 12 months, the debt was not classified as current in the 2013 and 2012 consolidated balance sheet in accordance with ASC 470-10. At December 31, 2013, the Company was fully compliant with the leverage ratio required by its loans irrespective of the waivers.
Debt at Carrying amount	1,380,298	1,442,427	'	'
Interest in subsidiary	'	51.00%	'	'
Working capital deficit	5,258	'	'	'
Minimum liquidity requirement	'	'	'	'
Long-Term Debt [Line Items]	'	'	'	'
Cash and cash equivalents	78,144	99,375	92,188	'
Covenant requirement reclassified to current liabilities	'	'	'	'
Long-Term Debt [Line Items]	'	'	'	'
Potential Prepayment	5,867	'	'	'
Term loan not in compliance with value-to-loan ratio	'	'	'	'
Long-Term Debt [Line Items]	'	'	'	'
Debt at Carrying amount	$34,300	'	'	'
Loan of Subsidiary	'	'	'	'
Long-Term Debt [Line Items]	'	'	'	'
Debt Instrument Covenant Compliance	'	'	'	'
		As of December 31, 2012, a subsidiary, in which the Company has a 51% interest, was not in compliance with the leverage ratio required by its loan. In this respect, in an amendatory agreement dated April 8, 2013 with the lenders, an existing waiver of the leverage ratio non-compliane was extended to June 30, 2014 (inclusive). At December 31, 2013, the subsidiary was fully compliant with the loan agreement.

Interest_and_Finance_Costs_net2

Interest and Finance Costs, net (Table) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financial Instruments [Abstract]	'	'	'
Interest expense	$41,741	$49,701	$51,720
Less: Interest capitalized	-1,945	-1,758	-2,532
Interest expense, net	39,796	47,943	49,188
Interest swap cash settlements non-hedging	5,012	8,043	8,977
Bunkers swap cash settlements	-151	-2,433	-6,382
Amortization of loan fees	1,101	946	995
Bank charges	379	243	277
Amortization of deferred loss on termination of financial instruments	877	2,173	2,020
Change in fair value of non-hedging financial instruments	-6,097	-5,339	-1,504
Net total	$40,917	$51,576	$53,571

Interest_and_Finance_Costs_net3

Interest and Finance Costs, net (Details) (USD $)	12 Months Ended				3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
				Designated As Hedging Instrument	Not Designated As Hedging Instrument	Not Designated As Hedging Instrument	Not Designated As Hedging Instrument	Two interest rate swaps	Two interest rate swaps	Bunker swap disposed prior to maturity
Number of floating-to-fixed interest rate swaps	7	'	'	5	'	2	2	'	'	'
Notional amount of floating-to-fixed interest rate swaps	$343,827	'	'	$221,077	'	'	'	'	'	'
Fixed interest rate	3.89%	'	'	'	'	'	'	'	'	'
Floating rate basis	'six-month LIBOR	'	'	'	'	'	'	'	'	'
Fair value of hedging interest rate swaps	-3,409	-11,295	'	'	'	'	'	'	'	'
Net amount of cash flow hedges to be reclassified into earnings within 12 months	2,082	'	'	'	'	'	'	'	'	'
Change in fair value of non-hedging financial instruments	6,097	5,339	1,504	'	'	'	'	6,025	6,989	'
De-designated hedging swap loss in accumulated other comprehensive income	154	'	'	'	'	'	'	'	'	'
Amortization of de-designated hedging swap loss in accumulated other comprehensive income	877	2,173	2,020	'	'	877	1,475	'	'	'
Future amortization of de-designated hedging swap loss in accumulated other comprehensive income	'	'	'	'	154	'	'	'	'	'
Reclassified loss from Accumulated other comprehensive income/(loss) to income on de-designated swaps	'	-698	-506	'	'	'	'	'	'	'
Number of bunker swap agreements held	5	2	'	'	'	'	'	'	'	'
Gain realized from disposal of bunker swap	-151	-2,433	-6,382	'	'	'	'	'	'	115
Fair value of bunker swap agreements	177	105	'	'	'	'	'	'	'	'
Change in fair value of bunker swap agreeements	$72	($1,650)	'	'	'	'	'	'	'	'

Stockholders_Equity_Details

Stockholders' Equity (Details) (USD $)

0 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

In Thousands, except Share data, unless otherwise specified

Feb. 05, 2014

Apr. 18, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Jan. 30, 2014

Oct. 30, 2013

Jul. 30, 2013

10-May-13

Dec. 31, 2013

Dec. 31, 2012

Jan. 17, 2014

Dec. 31, 2013

Aug. 08, 2013

Jan. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Preferred Class B Shares

Preferred Class B Shares

Preferred Class B Shares

Preferred Class B Shares

Preferred Class B Shares

Preferred Class B Shares

Distribution Agency Agreement

Distribution Agency Agreement

Distribution Agency Agreement

Preferred Class C Shares

Preferred Class C Shares

Preferred Class C Shares

Preferred Class C Shares

Third Party shareholding percentage

'

'

15.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred Shares - shares authorized

'

'

15,000,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred Shares - par value

'

'

$1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred Shares - shares issued

'

'

'

'

'

'

'

'

2,000,000

2,000,000

0

'

'

'

'

2,000,000

2,000,000

0

Net proceeds from issuance of preferred shares

'

'

$94,358

$0

$0

'

'

'

$47,043

'

'

'

'

'

'

$47,315

'

'

Dividend rate percentage

'

'

'

'

'

'

'

'

'

8.00%

'

'

'

'

'

'

8.88%

'

Preferred dividends per share

'

'

'

'

'

'

'

'

'

$2

'

'

'

'

'

'

$2.22

'

Preferred dividends

'

'

'

'

'

'

'

'

'

4,000

'

'

'

'

'

'

4,438

'

Redemption price

'

'

'

'

'

'

'

'

$25

'

'

'

'

'

'

$25

'

'

Conditions for dividend rate increase

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

If the Company fails to comply with certain covenants relating to the level of borrowings and net worth as these terms are defined in the applicable agreement, defaults on any of its credit facilities, fails to pay four quarterly dividends payable in arrears or if the Series B preferred shares are not redeemed at the option of the Company, in whole by July 30, 2019, the dividend rate payable on the Series B preferred shares increases quarterly to a rate that is 1.25 times the dividend rate payable on the series B preferred shares , subject to an aggregate maximum rate per annum of 25% prior to July 30, 2018 and 30% thereafter.

If the Company fails to comply with certain covenants relating to the level of borrowings and net worth as these terms are defined in the applicable agreement, defaults on any of its credit facilities, fails to pay four quarterly dividends payable in arrears or if the Series C preferred shares are not redeemed at the option of the Company in whole by October 30, 2020, the dividend rate payable on the Series C preferred shares increases quarterly to a rate that is 1.25 times the dividend rate payable on the Series C preferred shares, subject to an aggregate maximum rate per annum of 25% prior to October 30, 2018 and 30% thereafter.

Preferred stock dividends paid

'

'

1,889

'

'

1,000

1,000

889

'

'

'

'

'

'

1,479

'

'

'

Maximun number of shares issuable under distribution agency agreement

'

'

'

'

'

'

'

'

'

'

'

'

'

4,000,000

'

'

'

'

Common shares offered, price per share

$6.65

$6.50

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common shares - par value

'

'

$1

$1

'

'

'

'

'

'

'

'

'

$1

'

'

'

'

Common shares offered

12,995,000

10,000,000

'

10,000,000

'

'

'

'

'

'

'

1,077,847

1,430,211

'

'

'

'

'

Net proceeds from public offering

$82,678

$62,329

$7,045

$62,329

$0

'

'

'

'

'

'

$7,170

$7,045

'

'

'

'

'

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stockholders' Equity [Abstract]	'	'	'
RSUs issued	96,000	150,000	12,000
Fair value per share (weighted average)	$4.89	$3.75	$9.36
RSUs vested	96,000	'	'
Fair value of shares vested	$469	$974	$987
Number of RSUs issuable under incentive plan	888,950	'	'
Stock compensation expense	$469	$730	$820

Accumulated_other_comprehensiv1

Accumulated other comprehensive income/(loss) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated other comprehensive income/(loss) [Abstract]	'	'	'
Total unrealized gains from hedging financial instruments	$8,107	$20,169	$17,265
Changes in fair value of financial instruments	7,230	17,996	15,245
Losses reclassified to income	877	2,173	2,020
Change in fair value of marketable securities	-79	228	34
Gain on sale of marketable securities	$89	$95	$0

Earnings_per_Common_Share_Tabl1

Earnings per Common Share (Table) (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator	'	'	'
Net loss attributable to Tsakos Energy Navigation Limited	($37,462)	($49,263)	($89,496)
Preferred share dividends	-3,676	0	0
Net loss attributable to common stockholders	($41,138)	($49,263)	($89,496)
Denominator	'	'	'
Weighted average common shares outstanding	56,698,955	53,301,039	46,118,534
Basic and diluted loss per common share	($0.73)	($0.92)	($1.94)

Earnings_per_Common_Share_Deta

Earnings per Common Share (Details)	Dec. 31, 2013	Dec. 31, 2012
Earnings per Common Share [Abstract]	'	'
Balance of Non-Vested RSUs	0	0

Noncontrolling_Interest_In_Sub1

Noncontrolling Interest In Subsidiary (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Noncontrolling Interest in Subsidiary [Abstract]	'
Percentage of ownership in Mare Success S.A. by Polaris Oil Shipping Inc.	49.00%
Percentage of ownership in Mare Success S.A. by Tsakos Energy Navigation Ltd	51.00%
Percentage Of Revenue Generated By Single Charterer	8.30%
Capital contribution to subsidiary	$20,408
Capital contribution to subsidiary by Tsakos Energy Navigation Limited	10,408
Capital contribution to subsidiary by Polaris Oil Shipping Inc	$10,000

Income_Taxes_Details

Income Taxes (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Income Taxes [Abstract]	'
Tonnage taxes	$508

Commitments_and_Contingencies_1

Commitments and Contingencies (Table) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Charters-out [Abstract]	'
2014	$187,932
2015	127,484
2016	77,582
2017 to 2028	494,319
Minimum charter revenue	$887,317

Commitments_and_Contingencies_2

Commitments and Contingencies (Details) (USD $)	12 Months Ended			0 Months Ended			1 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 10, 2013	Dec. 31, 2013	Dec. 31, 2013	Jan. 31, 2013
				Five new-building aframax tankers	Aframax tankers	LNG Carriers	Shuttle tanker
Long-term Purchase Commitment [Line Items]	'	'	'	'	'	'	'
Number of vessels under construction	'	'	'	'	5	1	'
Construction price per vessel	'	'	'	$51,220	'	'	'
Expected Delivery	'	'	'	'between Q2 2016 and Q1 2017	'	'	'
Purchase obligations	'	'	'	'	'	'	'
Payable amounts in 2014	82,660	'	'	'	'	'	'
Payable amounts in 2015	51,692	'	'	'	'	'	'
Payable amounts in 2016	261,459	'	'	'	'	'	'
Payable amounts in 2017	30,732	'	'	'	'	'	'
Total contractual purchase obligation	426,543	'	'	'	'	'	'
Amount paid	$37,182	$81,848	$37,937	'	'	'	$4,500
Potential new contract with yard	'	'	'	'	'	'	'
							However, the contract was suspended as the Company reconsidered the type of vessel to be constructed. A new proposal from the yard is being considered which includes the paid amount of $4,500, as being part of the initial payment. In case an agreement for an alternative project is not reached, the amount of $4,500 may be considered by the yard as a compensation against the Company's default under the initial agreement and may claim additional compensation if the amount is found insufficient to cover shipyard's losses.

Financial_Instruments_Fair_Val

Financial Instruments - Fair Values (Table) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
In Thousands, unless otherwise specified
Financial Instruments [Abstract]	'	'	'	'	'
Cash and cash equivalents - Carrying Amount	$162,237	$144,297	$175,708	'	$276,637
Restricted cash - Carrying Amount	9,527	16,192	'	'	'
Marketable securities - Carrying Amount	0	1,664	'	2,500	'
Investments - Carrying Amount	1,000	1,000	'	'	'
Debt - Carrying amount	1,380,298	1,442,427	'	'	'
Cash and cash equivalents - Fair Value	162,237	144,297	'	'	'
Restricted cash - Fair value	9,527	16,192	'	'	'
Marketable securities - Fair Value	0	1,664	'	'	'
Investments - Fair Value	1,000	1,000	'	'	'
Debt - Fair Value	$1,378,753	$1,441,108	'	'	'

Financial_Instruments_Balance_

Financial Instruments - Balance Sheet Location (Table) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Derivatives designated as hedging instruments	'	'
Interest rate swaps - Liability Derivatives - Fair Value	($3,409)	($11,295)
Subtotal - Assets	1,401	0
Subtotal - Liabilities	4,810	11,295
Derivatives not designated as hedging instruments	'	'
Subtotal - Assets	177	105
Subtotal - Liabilities	5,179	11,204
Total derivatives - Assets	1,578	105
Total derivatives - Liabilites	9,989	22,499
Current portion of financial instruments - Fair value	'	'
Derivatives designated as hedging instruments	'	'
Interest rate swaps - Asset Derivatives - Fair Value	0	0
Interest rate swaps - Liability Derivatives - Fair Value	2,365	6,824
Derivatives not designated as hedging instruments	'	'
Interest rate swaps - Asset Derivatives - Fair Value	0	0
Interest rate swaps - Liability Derivatives - Fair Value	3,597	6,314
Bunker swaps - Asset Derivatives - Fair Value	140	60
Bunker swaps - Liability Derivatives - Fair Value	0	0
FINANCIAL INSTRUMENTS - FAIR VALUE, net of current portion	'	'
Derivatives designated as hedging instruments	'	'
Interest rate swaps - Asset Derivatives - Fair Value	1,401	0
Interest rate swaps - Liability Derivatives - Fair Value	2,445	4,471
Derivatives not designated as hedging instruments	'	'
Interest rate swaps - Asset Derivatives - Fair Value	0	0
Interest rate swaps - Liability Derivatives - Fair Value	1,582	4,890
Bunker swaps - Asset Derivatives - Fair Value	37	45
Bunker swaps - Liability Derivatives - Fair Value	$0	$0

Financial_Instruments_Gain_Los

Financial Instruments - Gain (Loss) Recognized in Accumulated Other Comprehensive Loss on Derivative (Effective Portion) (Table) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Total	$8,107	$20,169	$17,265
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss on Derivative (Effective Portion)	'	'	'
Interest rate swaps	-3,338	-2,964	-9,624
Total	($3,338)	($2,964)	($9,624)

Financial_Instruments_Gain_Los1

Financial Instruments - Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) (Table) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative	'	'	'
Total	($11,445)	($23,132)	($26,889)
Depreciation expense	'	'	'
Derivative	'	'	'
Interest rate swaps	-144	-122	-117
Interest and finance costs, net	'	'	'
Derivative	'	'	'
Interest rate swaps	($11,301)	($23,010)	($26,772)

Financial_Instruments_Derivati

Financial Instruments - Derivatives Not Designated as Hedging Instruments Gain (Loss) (Table) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative	'	'	'
Total	$1,235	($271)	($1,092)
Interest and finance costs, net	'	'	'
Derivative	'	'	'
Interest rate swaps	1,012	-1,054	-5,352
Bunker swaps	$223	$783	$4,260

Financial_Instruments_Fair_Val1

Financial Instruments - Fair Value of Assets and Liabilities Measured On Recurring Basis (Table) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2011
In Thousands, unless otherwise specified
Interest rate swaps	($9,989)	($22,499)	'
Marketable Securities	0	1,664	2,500
Bunker swaps	1,578	105	'
Significant Other Observable Inputs Assets / (Liabilities) (Level 2)	'	'	'
Interest rate swaps	-8,588	-22,499	'
Marketable Securities	0	1,664	'
Bunker swaps	177	105	'
Total	($8,411)	($20,730)	'

Financial_Instruments_Fair_Val2

Financial Instruments - Fair Value of Items Measured on Nonrecurring Basis (Table) (Details) (Significant Other Observable Inputs Assets / (Liabilities) (Level 2), USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Significant Other Observable Inputs Assets / (Liabilities) (Level 2)	'	'
Vessels	$95,250	$28,586
Total	$95,250	$28,586

Financial_Instruments_Details

Financial Instruments (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Present value of future cash flows of one bank loan	$1,378,753	$1,441,108
Carrying amount	1,380,298	1,442,427
Accumulated loss from derivatives designated as Hedging Instruments	6,789	14,895
Present value of long-term debt	'	'
Present value of future cash flows of one bank loan	51,698	'
Carrying amount of long-term debt	'	'
Carrying amount	$53,243	'

Subsequent_Events_Details

Subsequent Events (Details) (USD $)

0 Months Ended

12 Months Ended

0 Months Ended

In Thousands, except Share data, unless otherwise specified

Mar. 17, 2014

Feb. 05, 2014

Apr. 18, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Jan. 08, 2014

Jan. 30, 2014

Jan. 30, 2014

Feb. 05, 2014

Mar. 18, 2014

Mar. 04, 2014

Feb. 26, 2014

Five new-building aframax tankers

Preferred Class B Shares

Preferred Class C Shares

Common shares issued upon the exercise in full of option to purchase additional shares by the underwriters

Four new-building aframax crude carriers

Four new-building aframax crude carriers

Four new-building aframax crude carriers

Subsequent events [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount paid

'

'

'

$37,182

$81,848

$37,937

$25,610

'

'

'

$20,688

'

'

Preferred stock - Dividend per share paid

'

'

'

'

'

'

'

$0.50

$0.74

'

'

'

'

Common shares issued

'

12,995,000

10,000,000

'

10,000,000

'

'

'

'

1,695,000

'

'

'

Common shares offered, price per share

'

$6.65

$6.50

'

'

'

'

'

'

'

'

'

'

Common shares - par value

'

'

'

$1

$1

'

'

'

'

'

'

'

'

Net proceeds from public offering

'

$82,678

$62,329

$7,045

$62,329

$0

'

'

'

'

'

'

'

Number of new building contracts

'

'

'

'

'

'

'

'

'

'

'

'

4

Time charter agreement duration

'

'

'

'

'

'

'

'

'

'

'

'Five to twelve years

'

Common stock - Dividends per share declared

$0.05

'

'

'

'

'

'

'

'

'

'

'

'

Common stock - Dividends per share declared - payment date

22-May-14

'

'

'

'

'

'

'

'

'

'

'

'

Common stock - Dividends per share declared - record date

19-May-14

'

'

'

'

'

'

'

'

'

'

'

'