Star Bulk Carriers (SBLK) 20-F 27 Mar 20 2019 FY Annual report (foreign) Financial data

Document And Entity Information

Document And Entity Information	12 Months Ended
	Dec. 31, 2019shares
Document And Entity Information [Abstract]
Document Type	20-F
Document Period End Date	Dec. 31, 2019
Amendment Flag	false
Enity Registrant Name	Star Bulk Carriers Corp.
Entity Central Index Key	0001386716
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Shell Company	false
Entity Well Known Seasoned Issuer	No
Entity Emerging Growth Company	false
Entity Common Stock Shares Outstanding	96,066,226
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Trading Symbol	SBLK
Entity Interactive Data Current	Yes
Entity Address, Country	MH
Document Annual Report	true
Security 12b Title	Common Shares, par value $0.01 per share and 8.30% Senior Notes due 2022
Document Transition Report	false
Document Shell Company Report	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CURRENT ASSETS
Cash and cash equivalents	$ 117,819	$ 204,921	$ 257,911
Restricted cash, current (Note 9)	7,422	6,435	7,169
Trade accounts receivable, net	58,785	38,402
Inventories (Note 4)	51,153	27,436
Due from managers	899	284
Due from related parties (Note 3)	590	1,322
Prepaid expenses and other receivables	17,745	6,504
Derivative asset, current (Note 20)	216	537
Other current assets (Notes 3 and 18)	11,413	7,046
Vessel held for sale (Note 5)	0	5,949
Total Current Assets	266,042	298,836
FIXED ASSETS
Advances for vessels under construction and acquisition of vessels (Note 6)	0	59,900	48,574
Vessels and other fixed assets, net (Note 5)	2,965,527	2,656,108
Total Fixed Assets	2,965,527	2,716,008
OTHER NON-CURRENT ASSETS
Long term investment (Note 3)	1,162	1,108
Restricted cash, non-current (Note 9)	1,021	2,521	8,420
Leased buildings, right-of-use assets (Note 2)	1,216	0
Other non-current assets	3,703	3,664
TOTAL ASSETS	3,238,671	3,022,137
CURRENT LIABILITIES
Current portion of long term debt (Note 9)	150,350	101,007
Lease financing short term (Note 7)	52,145	65,837
Accounts payable	42,779	20,959
Due to managers	5,781	3,757
Due to related parties (Note 3)	4,017	1,649
Accrued liabilities (Note 15)	46,761	16,854
Derivative liability (Note 20)	1,724	1,799
Deferred revenue	7,374	10,855
Total Current Liabilities	310,931	222,717
NON-CURRENT LIABILITIES
8.30% 2022 Notes, net of unamortized debt issuance costs of $1,590 and $1,179, as of December 31, 2018 and 2019, respectively (Note 9)	48,821	48,410
Long term debt, net of current portion and unamortized debt issuance costs of $10,997 and $15,098, as of December 31, 2018 and 2019, respectively (Note 9)	960,589	685,819
Lease financing long term, net of unamortized debt issuance costs of $2,975 and $3,936, as of December 31, 2018 and 2019 respectively (Note 7)	369,831	540,925
Fair value of below market time charters acquired (Note 8)	2,473	3,553
Leased buildings, operating lease liabilities (Note 2)	1,216	0
Other non-current liabilities	770	668
TOTAL LIABILITIES	1,694,631	1,502,092
COMMITMENTS & CONTINGENCIES (Note 17)
SHAREHOLDERS' EQUITY
Preferred Shares; $0.01 par value, authorized 25,000,000 shares; none issued or outstanding at December 31, 2018 and 2019, respectively (Note 10)	0	0
Common Shares, $0.01 par value, 300,000,000 shares authorized; 92,627,349 shares issued and 92,285,986 shares (net of treasury shares) outstanding at December 31, 2018; 96,073,197 shares issued and 96,066,226 shares (net of treasury shares) outstanding as of December 31, 2019 (Note 10)	961	926
Additional paid in capital	2,544,342	2,502,429
Treasury shares (341,363 and 6,971 shares at December 31, 2018 and 2019, respectively)	(93)	(3,145)
Accumulated deficit	(1,001,170)	(980,165)
Total Shareholders' Equity	1,544,040	1,520,045	$ 1,088,052
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 3,238,671	$ 3,022,137

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Preferred Shares
Preferred Shares - Par Value	$ 0.01	$ 0.01
Preferred Shares - Shares Authorized	25,000,000	25,000,000
Preferred Shares - Shares Issued	0	0
Preferred Shares - Shares Outstanding	0	0
Common Shares
Common Shares - Par Value	$ 0.01	$ 0.01
Common Shares - Shares Authorized	300,000,000	300,000,000
Common Shares - Shares Issued	96,073,197	92,627,349
Common Shares - Shares Outstanding	96,066,226	92,285,986
Treasury Stock
Treasury Stock - Shares	6,971	341,363
8.30% 2022 Notes
Unamortized debt issuance costs	$ 1,179	$ 1,590
Long-term Debt
Unamortized debt issuance costs	15,098	10,997
Capital Lease Obligations
Unamortized debt issuance costs	$ 3,936	$ 2,975

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Voyage revenues (Note 18)	$ 821,365	$ 651,561	$ 331,976
Expenses
Voyage expenses (Note 3 and 19)	222,962	121,596	64,682
Charter-in hire expenses (Note 3)	126,813	92,896	5,325
Vessel operating expenses (Note 19)	160,062	128,872	101,428
Dry docking expenses	57,444	8,970	4,262
Depreciation	124,280	102,852	82,623
Management fees (Note 3 and 12)	17,500	11,321	7,543
General and administrative expenses (Note 3)	34,819	33,972	30,955
Impairment loss (Note 5 and 20)	3,411	17,784	0
Other operational loss	110	191	989
Other operational gain (Note 11)	(2,423)	0	(2,918)
Provision for doubtful debts	1,607	722	0
(Gain)/Loss on forward freight agreements and bunker swaps (Note 20)	(4,411)	447	841
(Gain)/Loss on sale of vessels ( Note 5)	5,493	0	(2,598)
Total Operating Expenses	747,667	519,623	293,132
Operating income / (loss)	73,698	131,938	38,844
Other Income/ (Expenses):
Interest and finance costs (Note 9)	(87,617)	(73,715)	(50,458)
Interest and other income/(loss)	1,299	1,866	2,997
Gain / (Loss) on derivative financial instruments, net (Note 20)	0	707	246
Loss on debt extinguishment (Note 9)	(3,526)	(2,383)	(1,257)
Total other expenses, net	(89,844)	(73,525)	(48,472)
Income / (loss) before taxes and equity in income of investee	(16,146)	58,413	(9,628)
Income taxes (Note 16)	(109)	(61)	(236)
Income/(Loss) before equity in income of investee	(16,255)	58,352	(9,864)
Equity in income of investee	54	45	93
Net income/(loss)	$ (16,201)	$ 58,397	$ (9,771)
Earnings / (Loss) per share, basic	$ (0.17)	$ 0.76	$ (0.16)
Earnings / (Loss) per share, diluted	$ (0.17)	$ 0.76	$ (0.16)
Weighted average number of shares outstanding, basic (Note 14)	93,735,549	77,061,227	63,034,394
Weighted average number of shares outstanding, diluted (Note 14)	93,735,549	77,326,111	63,034,394

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income / (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net income / (loss)	$ (16,201)	$ 58,397	$ (9,771)
Other comprehensive income / (loss):
Unrealized gain / (loss) from hedging interest rate swaps recognized in Other comprehensive income/(loss) before reclassifications	0	106	47
Less:
Reclassification adjustments of interest rate swap gain/(loss)	0	(711)	852
Other comprehensive income / (loss)		(605)	899
Total comprehensive income / (loss)	$ (16,201)	$ 57,792	$ (8,872)

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Shares	Common SharesOCC vessels	Common SharesSonga Vessels	Common SharesAugustea Vessels	Common SharesE.R Vessels	Common SharesDelphin Vessels	Additional Paid-in Capital	Additional Paid-in CapitalOCC vessels	Additional Paid-in CapitalSonga Vessels	Additional Paid-in CapitalAugustea Vessels	Additional Paid-in CapitalE.R Vessels	Additional Paid-in CapitalDelphin Vessels	Accumulated Other Comprehensive income/(loss)	Accumulated deficit	Treasury Stock	Treasury StockSonga Vessels	Total	OCC vessels	Songa Vessels	Augustea Vessels	E.R Vessels	Delphin Vessels
BALANCE, value at Dec. 31, 2016	$ 566						$ 2,063,490						$ (294)	$ (1,026,532)	$ 0		$ 1,037,230
BALANCE, shares at Dec. 31, 2016	56,628,907
Net income / (loss)														(9,771)			(9,771)
Other comprehensive income / (loss)													899				899
Issuance of vested and non-vested shares and amortization of share-based compensation (Note 13), value	$ 13						9,254										9,267
Issuance of vested and non-vested shares and amortization of share-based compensation (Note 13), shares	1,220,825
Issuance of common stock (Note 10), value	$ 63						50,364										50,427
Issuance of common stock (Note 10), shares	6,310,272
BALANCE, value at Dec. 31, 2017	$ 642						2,123,108						605	(1,036,303)	0		1,088,052
BALANCE, shares at Dec. 31, 2017	64,160,004
Cumulative effect of accounting change														(2,259)			(2,259)
Net income / (loss)														58,397			58,397
Other comprehensive income / (loss)													(605)				(605)
Issuance of vested and non-vested shares and amortization of share-based compensation (Note 13), value	$ 8						8,064										8,072
Issuance of vested and non-vested shares and amortization of share-based compensation (Note 13), shares	868,975
Secondary offering expenses							(2,032)										(2,032)
Acquisition of vessels (Note 3, 5 and 10), value		$ 33	$ 137	$ 103	$ 3			$ 42,929	$ 182,543	$ 143,780	$ 4,037							$ 42,962	$ 182,680	$ 143,883	$ 4,040
Acquisition of vessels (Note 3, 5 and 10), shares		3,304,735	13,725,000	10,277,335	291,300
Purchase of treasury stock (Note 10), value															(3,145)		(3,145)
BALANCE, value at Dec. 31, 2018	$ 926						2,502,429						$ 0	(980,165)	(3,145)		1,520,045
BALANCE, shares at Dec. 31, 2018	92,627,349
Net income / (loss)														(16,201)			(16,201)
Issuance of vested and non-vested shares and amortization of share-based compensation (Note 13), value	$ 9						7,934										7,943
Issuance of vested and non-vested shares and amortization of share-based compensation (Note 13), shares	883,700
Dividend declared and paid ($0.05 per share)														(4,804)			(4,804)
Acquisition of vessels, value																$ (93)			$ (93)
Acquisition of vessels (Note 3, 5 and 10), value					$ 10	$ 45					$ 10,055	$ 47,470									$ 10,065	$ 47,515
Acquisition of vessels (Note 3, 5 and 10), shares					999,336	4,503,370
Purchase of treasury stock (Note 10), value	$ (29)						(23,546)								3,145		(20,430)
Purchase of treasury stock (Note 10), shares	(2,940,558)
BALANCE, value at Dec. 31, 2019	$ 961						$ 2,544,342							$ (1,001,170)	$ (93)		$ 1,544,040
BALANCE, shares at Dec. 31, 2019	96,073,197

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parentheticals)	12 Months Ended
	Dec. 31, 2019$ / shares
Business Acquisition [Line Items]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.05

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities:
Net income / (loss)	$ (16,201)	$ 58,397	$ (9,771)
Adjustments to reconcile net income/(loss) to net cash provided by/(used in) operating activities:
Depreciation	124,280	102,852	82,623
Amortisation of fair value of above market time charters (Note 8)	336	0	0
Amortisation of fair value of below market time charters (Note 8)	(2,349)	(1,820)	0
Amortization of debt issuance costs (Note 9)	5,590	3,253	2,660
Loss on debt extinguishment (Note 9)	3,526	2,383	1,257
Impairment loss (Note 5)	3,411	17,784	0
Loss / (gain) on sale of vessels (Note 5)	5,493	0	(2,598)
Provision for doubtful debts	1,607	722	0
Share-based compensation (Note 13)	7,943	8,072	9,267
Non-cash effects of derivative financial instruments	0	(1,230)	(1,821)
Fair value hedge adjustment (Note 20)	0	(1,609)	0
Change in fair value of forward freight derivatives and bunker swaps (Note 20)	246	1,339	(36)
Other non-cash charges	28	108	144
Amortization of deferred gain	0	0	(52)
Gain on hull and machinery claims (Note 11)	(2,264)	(309)	(456)
Equity in income of investee	(54)	(45)	(93)
(Increase)/Decrease in:
Trade accounts receivable	(20,383)	(22,266)	(5,949)
Inventories	(23,717)	(8,091)	(4,811)
Prepaid expenses and other receivables	(14,940)	(7,545)	(43)
Due from related parties	732	(1,091)	745
Due from managers	(615)	(284)	1,430
Other non-current assets	(357)	(1,972)	0
Increase/(Decrease) in:
Accounts payable	3,627	10,288	4,709
Due to related parties	2,368	1,420	(127)
Accrued liabilities	11,675	3,827	(863)
Due to managers	2,024	2,337	1,420
Deferred revenue	(3,481)	2,489	5,169
Net cash provided by / (used in) Operating Activities	88,525	169,009	82,804
Cash Flows from Investing Activities:
Advances for vessels under construction and acquisition of vessels and other fixed assets	(347,140)	(328,634)	(143,684)
Cash proceeds from vessel sales (Note 5)	56,632	0	15,153
Hull and machinery insurance proceeds	10,671	3,307	1,430
Net cash provided by / (used in) Investing Activities	(279,837)	(325,327)	(127,101)
Cash Flows from Financing Activities:
Proceeds from bank loans, leases and notes	768,282	987,980	160,780
Loan and lease prepayments and repayments	(623,892)	(875,037)	(86,262)
Financing and debt extinguishment fees paid	(15,366)	(13,818)	(2,910)
Dividends paid	(4,804)	0	0
Proceeds from issuance of common stock	0	0	51,454
Offering expenses paid related to the issuance of common stock	0	(532)	(1,027)
Repurchase of common shares	(20,523)	(3,145)	0
Refund of financing premia	0	1,247	0
Net cash provided by / (used in) Financing Activities	103,697	96,695	122,035
Net increase/(decrease) in cash and cash equivalents and restricted cash	(87,615)	(59,623)	77,738
Cash and cash equivalents and restricted cash at beginning of period	213,877	273,500	195,762
Cash and cash equivalents and restricted cash at end of period	126,262	213,877	273,500
Cash paid during the year for:
Interest	82,172	65,158	50,227
Non-cash investing and financing activities:
Shares issued in connection with vessel acquisitions	57,580	373,565	0
Vessel upgrades	27,848	0	0
Reconciliation of (a) cash and cash equivalents, and restricted cash reported within the consolidated balance sheets to (b) the total amount of such items reported in the statements of cash flows:
Cash and cash equivalents	117,819	204,921	257,911
Restricted cash, current (Note 9)	7,422	6,435	7,169
Restricted cash, non-current (Note 9)	1,021	2,521	8,420
Cash and cash equivalents and restricted cash at end of period shown in the statement of cash flows	$ 126,262	$ 213,877	$ 273,500

Basis of Presentation and Gener

Basis of Presentation and General Information	12 Months Ended
	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and General Information:	1. Basis of Presentation and General Information: The consolidated financial statements as of December 31, 2018 and 2019 and for the years ended December 31, 2017, 2018 and 2019, include the accounts of Star Bulk Carriers Corp. (“Star Bulk”) and its wholly owned subsidiaries as set forth below (collectively, the “Company”). Star Bulk was incorporated on December 13, 2006 under the laws of the Marshall Islands and maintains offices in Athens, Oslo, New York, Limassol and Geneva. The Company is engaged in the ocean transportation of dry bulk cargoes worldwide through the ownership and operation of dry bulk carrier vessels. Since December 3, 2007, Star Bulk shares trade on the NASDAQ Global Select Market under the ticker symbol “SBLK” (primary listing). Following, and in connection with, the Songa Vessel Purchase Transaction, as defined below in Note 3, Star Bulk’s common shares also trade on the Oslo Stock Exchange (secondary listing) under the same ticker. As of December 31, 2019, the Company owned a modern fleet of 116 dry bulk vessels consisting of Newcastlemax, Capesize, Post Panamax, Kamsarmax, Panamax, Ultramax and Supramax vessels with a carrying capacity between 52,425 deadweight tonnage (“dwt”) and 209,537 dwt, and a combined carrying capacity of 12.9 million dwt. Additionally, through its subsidiary, Star Logistics Management S.A. (or “Star Logistics”), which was formed in October 2017 and is based in Geneva, Switzerland, the Company chartered-in a number of third-party vessels on a short- to medium- term basis (usually not exceeding one year) to increase its operating capacity in order to satisfy its clients’ needs. Effective January 1, 2020, all activities of Star Logistics were transferred to Star Bulk (Singapore) Pte. Ltd (or “Star Bulk Singapore”), a newly established wholly-owned subsidiary of the Company based in Singapore. Below is the list of the Company’s wholly owned subsidiaries as of December 31, 2019: Subsidiaries owning vessels in operation at December 31, 2019: Date Wholly Owned Subsidiaries Vessel Name DWT Delivered to Star Bulk Year Built 1 Sea Diamond Shipping LLC Goliath 209,537 July 15, 2015 2015 2 Pearl Shiptrade LLC Gargantua 209,529 April 2, 2015 2015 3 Star Ennea LLC Star Poseidon 209,475 February 26, 2016 2016 4 Coral Cape Shipping LLC Maharaj 209,472 July 15, 2015 2015 5 Star Castle II LLC Star Leo (1) 207,939 May 14, 2018 2018 6 ABY Eleven Ltd Star Laetitia 207,896 August 3, 2018 2017 7 Domus Shipping LLC Star Ariadne 207,812 March 28, 2017 2017 8 Star Breezer LLC Star Virgo 207,810 March 1, 2017 2017 9 Star Seeker LLC Star Libra (1) 207,765 June 6, 2016 2016 10 ABY Nine Ltd Star Sienna 207,721 August 3, 2018 2017 11 Clearwater Shipping LLC Star Marisa 207,709 March 11 2016 2016 12 ABY Ten Ltd Star Karlie 207,566 August 3, 2018 2016 13 Star Castle I LLC Star Eleni (1) 207,555 January 3, 2018 2018 14 Festive Shipping LLC Star Magnanimus 207,490 March 26, 2018 2018 15 New Era II Shipping LLC Debbie H 206,861 May 28, 2019 2019 16 New Era III Shipping LLC Star Ayesha 206,852 July 15, 2019 2019 17 New Era I Shipping LLC Katie K 206,839 April 16, 2019 2019 18 Cape Ocean Maritime LLC Leviathan 182,511 September 19, 2014 2014 19 Cape Horizon Shipping LLC Peloreus 182,496 July 22, 2014 2014 20 Star Nor I LLC Star Claudine (1) 181,258 July 6, 2018 2011 21 Star Nor II LLC Star Ophelia (1) 180,716 July 6, 2018 2010 22 Christine Shipco LLC Star Martha 180,274 October 31, 2014 2010 23 Sandra Shipco LLC Star Pauline 180,233 December 29, 2014 2008 24 Pacific Cape Shipping LLC Pantagruel 180,181 July 11, 2014 2004 25 Star Borealis LLC Star Borealis 179,678 September 9, 2011 2011 26 Star Polaris LLC Star Polaris 179,546 November 14, 2011 2011 27 Star Nor III LLC Star Lyra (1) 179,147 July 6, 2018 2009 28 Star Regg II LLC Star Janni 178,978 January 7, 2019 2010 29 Star Regg I LLC Star Marianne 178,906 January 14, 2019 2010 30 Star Trident V LLC Star Angie 177,931 October 29, 2014 2007 31 Sky Cape Shipping LLC Big Fish 177,662 July 11, 2014 2004 32 Global Cape Shipping LLC Kymopolia 176,990 July 11, 2014 2006 33 Star Trident XXV Ltd. Star Triumph 176,343 December 8, 2017 2004 34 ABY Fourteen Ltd Star Scarlett 175,800 August 3, 2018 2014 35 ABY Fifteen Ltd Star Audrey 175,125 August 3, 2018 2011 36 Sea Cape Shipping LLC Big Bang 174,109 July 11, 2014 2007 37 ABY I LLC Star Paola 115,259 August 3, 2018 2011 38 ABM One Ltd Star Eva 106,659 August 3, 2018 2012 39 Nautical Shipping LLC Amami 98,681 July 11, 2014 2011 40 Majestic Shipping LLC Madredeus 98,681 July 11, 2014 2011 41 Star Sirius LLC Star Sirius 98,681 March 7, 2014 2011 42 Star Vega LLC Star Vega 98,681 February 13, 2014 2011 43 ABY II LLC Star Aphrodite 92,006 August 3, 2018 2011 44 Augustea Bulk Carrier Ltd Star Piera 91,952 August 3, 2018 2010 45 Augustea Bulk Carrier Ltd Star Despoina 91,945 August 3, 2018 2010 46 Star Nor IV LLC Star Electra (1) 83,494 July 6, 2018 2011 47 Star Alta I LLC Star Angelina 82,981 December 5, 2014 2006 48 Star Alta II LLC Star Gwyneth 82,790 December 5, 2014 2006 49 Star Trident I LLC Star Kamila 82,769 September 3, 2014 2005 50 Star Nor VI LLC Star Luna (1) 82,687 July 6, 2018 2008 51 Star Nor V LLC Star Bianca (1) 82,672 July 6, 2018 2008 52 Grain Shipping LLC Pendulum 82,619 July 11, 2014 2006 53 Star Trident XIX LLC Star Maria 82,598 November 5, 2014 2007 54 Star Trident XII LLC Star Markella 82,594 September 29, 2014 2007 55 Star Trident IX LLC Star Danai 82,574 October 21, 2014 2006 56 ABY Seven Ltd Star Jeanette 82,567 August 3, 2018 2014 57 Star Trident XI LLC Star Georgia 82,298 October 14, 2014 2006 58 Star Trident VIII LLC Star Sophia 82,269 October 31, 2014 2007 59 Star Trident XVI LLC Star Mariella 82,266 September 19, 2014 2006 60 Star Trident XIV LLC Star Moira 82,257 November 19, 2014 2006 61 Star Trident XVIII LLC Star Nina 82,224 January 5, 2015 2006 62 Star Trident X LLC Star Renee 82,221 December 18, 2014 2006 63 Star Trident II LLC Star Nasia 82,220 August 29, 2014 2006 64 Star Trident XIII LLC Star Laura 82,209 December 8, 2014 2006 65 Star Trident XV LLC Star Jennifer 82,209 April 15, 2015 2006 66 Star Nor VIII LLC Star Mona (1) 82,188 July 6, 2018 2012 67 Star Trident XVII LLC Star Helena 82,187 December 29, 2014 2006 68 Star Nor VII LLC Star Astrid (1) 82,158 July 6, 2018 2012 69 Waterfront Two Ltd Star Alessia 81,944 August 3, 2018 2017 70 Star Nor IX LLC Star Calypso (1) 81,918 July 6, 2018 2014 71 Star Gaia LLC Star Charis 81,711 March 22, 2017 2013 72 Star Elpis LLC Star Suzanna 81,711 May 15, 2017 2013 73 Mineral Shipping LLC Mercurial Virgo 81,545 July 11, 2014 2013 74 Star Nor X LLC Stardust (1) 81,502 July 6, 2018 2011 75 Star Nor XI LLC Star Sky (1) 81,466 July 6, 2018 2010 76 ABY III LLC Star Lydia 81,187 August 3, 2018 2013 77 ABY IV LLC Star Nicole 81,120 August 3, 2018 2013 78 ABY Three Ltd Star Virginia 81,061 August 3, 2018 2015 79 Star Nor XII LLC Star Genesis (1) 80,705 July 6, 2018 2010 80 Star Nor XIII LLC Star Flame (1) 80,448 July 6, 2018 2011 81 Star Trident III LLC Star Iris 76,466 September 8, 2014 2004 82 Star Trident XX LLC Star Emily 76,417 September 16, 2014 2004 83 Orion Maritime LLC Idee Fixe (1) 63,458 March 25, 2015 2015 84 Primavera Shipping LLC Roberta (1) 63,426 March 31, 2015 2015 85 Success Maritime LLC Laura (1) 63,399 April 7, 2015 2015 86 Ultra Shipping LLC Kaley (1) 63,283 June 26, 2015 2015 87 Blooming Navigation LLC Kennadi 63,262 January 8, 2016 2016 88 Jasmine Shipping LLC Mackenzie 63,226 March 2, 2016 2016 89 STAR LIDA I SHIPPING LLC Apus (1) 63,123 July 16, 2019 2014 90 Star Nor XV LLC Star Wave (1) 61,491 July 6, 2018 2017 91 Star Challenger I LLC Star Challenger (1) 61,462 December 12, 2013 2012 92 Star Challenger II LLC Star Fighter (1) 61,455 December 30, 2013 2013 93 Star Axe II LLC Star Lutas 61,347 January 6, 2016 2016 94 Aurelia Shipping LLC Honey Badger 61,320 February 27, 2015 2015 95 Rainbow Maritime LLC Wolverine 61,292 February 27, 2015 2015 96 Star Axe I LLC Star Antares 61,258 October 9, 2015 2015 97 ABY Five Ltd Star Monica 60,935 August 3, 2018 2015 98 Star Asia I LLC Star Aquarius 60,916 July 22, 2015 2015 99 Star Asia II LLC Star Pisces (1) 60,916 August 7, 2015 2015 100 Star Nor XIV LLC Star Glory (1) 58,680 July 6, 2018 2012 101 STAR LIDA XI SHIPPING LLC Pyxis (1) 56,615 August 19, 2019 2013 102 STAR LIDA VIII SHIPPING LLC Hydrus (1) 56,604 August 8, 2019 2013 103 STAR LIDA IX SHIPPING LLC Leo (1) 56,582 July 15, 2019 2013 104 Star Trident VII LLC Diva 56,582 July 24, 2017 2011 105 STAR LIDA VI SHIPPING LLC D.Centaurus (1) 56,559 September 18, 2019 2012 106 STAR LIDA VII SHIPPING LLC Hercules (1) 56,545 July 16, 2019 2012 107 STAR LIDA X SHIPPING LLC Pegasus (1) 56,540 July 15, 2019 2013 108 STAR LIDA III SHIPPING LLC Cepheus (1) 56,539 July 16, 2019 2012 109 STAR LIDA IV SHIPPING LLC Columba (1) 56,530 July 23, 2019 2012 110 STAR LIDA V SHIPPING LLC Dorado (1) 56,507 July 16, 2019 2013 111 STAR LIDA II SHIPPING LLC Aquila (1) 56,506 July 15, 2019 2012 112 Star Regg III LLC Star Bright 55,783 October 10, 2018 2010 113 Glory Supra Shipping LLC Strange Attractor 55,742 July 11, 2014 2006 114 Star Omicron LLC Star Omicron 53,489 April 17, 2008 2005 115 Star Zeta LLC Star Zeta 52,994 January 2, 2008 2003 116 Star Theta LLC Star Theta 52,425 December 6, 2007 2003 Total dwt 12,859,300 (1) Subject to a bareboat charter with purchase obligation at the expiration of the bareboat charter term (Note 7) Non-vessel owning subsidiaries at December 31, 2019: Wholly Owned Subsidiaries 1 Star Bulk Management Inc. 37 Cape Confidence Shipping LLC 2 Starbulk S.A. 38 Cape Runner Shipping LLC 3 Star Bulk Manning LLC 39 Olympia Shiptrade LLC 4 Star Bulk Shipmanagement Company (Cyprus) Limited 40 Victory Shipping LLC 5 Candia Shipping Limited (ex Optima Shipping Limited) 41 Star Cape I LLC 6 Star Omas LLC 42 Star Cape II LLC 7 Star Synergy LLC 43 Positive Shipping Company 8 Oceanbulk Shipping LLC 44 OOCape1 Holdings LLC 9 Oceanbulk Carriers LLC 45 Oday Marine LLC 10 International Holdings LLC 46 Searay Maritime LLC 11 Star Ventures LLC 47 Lowlands Beilun Shipco LLC 12 Star Logistics LLC (ex Dry Ventures LLC) 48 Star Trident VI LLC 13 Unity Holding LLC 49 KMSRX Holdings LLC 14 Star Bulk (USA) LLC 50 Dioriga Shipping Co. 15 Star Trident XXI LLC 51 Star Trident XXX LLC 16 Star Trident XXIV LLC 52 Star Trident IV LLC 17 Star Trident XXVII LLC 53 Pacific Ventures Holdings LLC 18 Star Trident XXXI LLC 54 Star Mare LLC 19 Star Trident XXIX LLC 55 Star Regg IV LLC 20 Star Trident XXVIII LLC 56 Star Regg V LLC 21 Star Trident XXVI LLC 57 Star Regg VI LLC 22 Star Trident XXII LLC 58 Star Regg VII LLC 23 Star Trident XXIII LLC 59 Star Sege Ltd 24 Star Alpha LLC 60 Star Gamma LLC 25 Star Bulk Norway AS 61 Star Delta LLC 26 Star New Era LLC 62 Star Epsilon LLC 27 Star Thor LLC 63 Star Kappa LLC 28 Star ABY LLC 64 Star Aurora LLC 29 ABY Group Holding Ltd 65 Star Uranus LLC 30 Star Regina LLC 66 Star Trident VII LLC 31 Star Logistics Management S.A. 67 Star Trident XII LLC 32 Gravity Shipping LLC 68 Star Trident XIII LLC 33 White Sand Shipping LLC 69 Star Trident XVI LLC 34 Premier Voyage LLC 70 Star Bulk (Singapore) Pte. Ltd 35 L.A. Cape Shipping LLC 71 Star Bulk Germany GmbH 36 Star Cosmo LLC Charterers who individually accounted for more than 10% of the Company’s voyage revenues during the years ended December 31, 2017, 2018 and 2019 are as follows: Charterer 2017 2018 2019 A N/A 15% 13% B 14% N/A N/A The outstanding accounts receivable balance as at December 31, 2019 of this charterer (A) was $2,876.

Significant Accounting policies

Significant Accounting policies	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Significant Accounting policies	2. Significant Accounting policies: a) Principles of consolidation: Star Bulk as the holding company determines whether it has controlling financial interest in an entity by first evaluating whether the entity is a voting interest entity or a variable interest entity. Under ASC 810 “Consolidation”, a voting interest entity is an entity in which the total equity investment at risk is sufficient to enable the entity to finance itself independently and provides the equity holders with the obligation to absorb losses, the right to receive residual returns and make financial and operating decisions. Star Bulk consolidates voting interest entities in which it owns all, or at least a majority (generally, greater than 50%), of the voting interest. Following the provisions of ASC 810 “Consolidation”, the Company evaluates all arrangements that may include a variable interest in an entity to determine if it may be the primary beneficiary, and would be required to include assets, liabilities and operations of a variable interest entity (“VIE”) in its consolidated financial statements. The Company’s evaluation did not result in an identification of variable interest entities for the years 2017, 2018 and 2019. b) Equity method investments: c) Use of estimates: d) Comprehensive income/(loss): e) Concentration of credit risk: f) Foreign currency transactions: g) Cash and cash equivalents: h) Restricted cash i) Trade accounts receivable, net: j) Inventories: k) Vessels, net: The cost of each of the Company’s vessels is depreciated beginning when the vessel is ready for its intended use, on a straight-line basis over the vessel’s remaining economic useful life, after considering the estimated residual value (vessel’s residual value is equal to the product of its lightweight tonnage and estimated scrap rate per ton). Management estimates the useful life of the Company’s vessels to be 25 years from the date of initial delivery from the shipyard. When regulations place limitations over the ability of a vessel to trade on a worldwide basis, its remaining useful life is adjusted at the date such regulations are adopted. The estimated salvage value of each vessel is $0.3 per light weight ton as of December 31, 2019 and 2018, which is based on the historical average demolition prices. l) Advances for vessels under construction and acquisition of vessels: m) Fair value of above/below market acquired time charters: n) Impairment of long-lived assets: In this respect, management regularly reviews the carrying amount of the vessels, including newbuilding contracts, if any, on a vessel-by-vessel basis, when events and circumstances indicate that the carrying amount of the vessels or newbuilding contracts might not be recoverable (such as vessel sales and purchases, business plans, obsolescence or damage to the asset and overall market conditions). When impairment indicators are present, the Company compares future undiscounted net operating cash flows to the carrying values of the Company’s vessels to determine if the asset is required to be impaired. In developing its estimates of future undiscounted net operating cash flows, the Company makes assumptions and estimates about vessels’ future performance, with the significant assumptions being related to charter rates, ship operating expenses, vessels’ residual value, fleet utilization and the estimated remaining useful lives of the vessels. These assumptions are based on current market conditions, historical industry and Company’s specific trends, as well as future expectations. The future undiscounted net operating cash flows are determined by considering the charter revenues from existing time charters for the fixed vessel days and an estimated daily time charter equivalent rate for the unfixed days over the estimated remaining economic life of each vessel, net of brokerage and address commissions. Estimates of the daily time charter equivalent rate for the unfixed days are based on the current Forward Freight Agreement (“FFA”) rates, for the first three-year period, average of FFA rates and historical average rate levels for the fourth year and historical average rate levels of similar size vessels for the period thereafter. The expected cash inflows from charter revenues are based on an assumed fleet utilization rate for the unfixed days over available days, taking also into account expected technical off-hire days. In addition, in light of the Company’s investment in exhaust gas cleaning systems (“EGCS” or “Scrubbers”), an estimate of an additional daily revenue for each scrubber fitted vessel was also included, reflecting additional compensation from charterers due to the fuel cost savings that these vessels provide. In assessing expected future cash outflows, management forecasts vessel operating expenses, which are based on the Company’s internal budget for the first annual period and thereafter assume an annual inflation rate and are capped at the thirteenth year thereafter, vessel expected maintenance costs (for dry docking and special surveys) and management fees. The estimated salvage value of each vessel is $0.3 per light weight ton, in accordance with the Company’s vessel depreciation policy. The Company uses a probability weighted approach for developing estimates of future cash flows used to test its vessels for recoverability when alternative courses of action are under consideration (i.e. sale or continuing operation of a vessel). If the Company’s estimate of future undiscounted net operating cash flows for any vessel is lower than the vessel’s carrying value, the carrying value is written down to the vessel’s fair market value with a charge recorded under “Impairment loss” in the consolidated statement of operations. o) Vessels held for sale: Vessels classified as held for sale are measured at the lower of their carrying amount or fair value less cost to sell. The resulting difference, if any, is recorded under “Impairment loss” in the consolidated statement of operations. The vessels are not depreciated once they meet the criteria to be classified as held for sale. p) Financing costs: . q) Debt Modifications and extinguishments: r) Share based compensation: Awards of restricted shares, restricted share units or share options that are subject to performance conditions are also measured at their fair value, which is equal to the market value of the Company’s common shares on the grant date. If the award is subject only to performance conditions, compensation cost is recognized only if the performance conditions are satisfied (essentially, the requisite service is not considered to have been provided if the performance condition is not achieved). For awards that are subject to performance conditions and future service conditions, if it is probable that the performance condition for these awards will be satisfied, the compensation cost in respect of these awards is recognized over the requisite service period. If it is initially determined that it is not probable that the performance condition will be satisfied and it is later determined that the performance conditions are likely to be satisfied (or vice versa), the effect of the change in estimate is retroactively accounted for in the period of change by recording a cumulative catch-up adjustment to retroactively apply the new estimate. If the award is forfeited because the performance condition is not satisfied, any previously recognized compensation cost is reversed. The fair value of share options grants is determined with reference to option pricing models, and depends on the terms of the granted options. The fair value is recognized (as compensation expense) over the requisite service period for all awards that vest. s) Dry docking and special survey expenses: t) Accounting for revenue and related expenses: Under time charter agreements, voyage costs, such as fuel and port charges are borne and paid by the charterer. The Company’s time charter agreements are classified as operating leases pursuant to ASC 842 “Leases”, as further disclosed in Note 2(x). As further analyzed in Note 2(x), the Company has determined that its voyage charter agreements do not contain a lease and are therefore considered service contracts that fall under the provisions of ASC 606. The majority of revenue from voyage charter agreements is usually collected in advance. The Company has determined that there is one single performance obligation for each of its voyage contracts, which is to provide the charterer with an integrated transportation service within a specified time period. In addition, the Company has concluded that a contract for a voyage charter meets the criteria to recognize revenue over time because the charterer simultaneously receives and consumes the benefits of the Company’s performance as the Company performs. Therefore, since the Company’s performance obligation under each voyage contract is met evenly as the voyage progresses, revenue is recognized on a straight line basis over the voyage days from the loading of cargo to its discharge. Demurrage income, which is considered a form of variable consideration, is included in voyage revenues, and represents payments by the charterer to the vessel owner when loading or discharging time exceeds the stipulated time in the voyage charter agreements. Demurrage income for the years ended December 31, 2017, 2018 and 2019 was not material. Under voyage charter agreements, all voyage costs are borne and paid by the Company. Voyage expenses consist primarily of brokerage commissions, bunker consumption, port and canal expenses and agency fees related to the voyage. Pursuant to the provisions of ASC 340-40, “Other Assets and Deferred Costs – Contracts with Customers” for contract costs, all voyage costs are considered contract fulfilment costs because they are directly related to the performance of the voyage contract. Those costs are expensed as incurred, with the exception of those contract fulfilment costs incurred prior to the commencement of loading the cargo on the relevant vessel, which are capitalized to the extent the Company, in its reasonable judgement, determines that they (i) are directly related to a contract, (ii) will be recoverable and (iii) enhance the Company’s resources by putting the Company’s vessel in a location to satisfy its performance obligation under a contract. These capitalized contract fulfilment costs are recorded under “Other current assets” and are amortized on a straight-line basis as the related performance obligations are satisfied. The Company adopted ASC 606 on January 1, 2018 using the modified retrospective approach, and has been applied to all voyage contracts not completed as of the date of the initial application. As such, the information prior to January 1, 2018 has not been restated and continues to be reported under the accounting standards in effect for periods prior to January 1, 2018. u) Fair value measurements: v) Earnings / (loss) per share: w) Segment reporting : x) Leases : The Company elected to use the optional new transition method for the adoption of ASC 842 that results in initial recognition of a cumulative effect adjustment to retained earnings in the year of adoption. As a result, prior periods as reported by the Company, have not been impacted by the adoption. The Company also elected to use the practical expedient for lessors to combine the lease and non-lease components of revenues for recognition, measurement and presentation purposes, as also described below. In addition, in connection with its adoption of ASC 842, the Company elected to use the “package of 3” practical expedients permitted under the transition guidance, which exempts the Company from reassessing: • whether any expired or existing contracts are or contain leases; • any expired or existing lease classifications; and • initial direct costs for any existing leases. Lastly, the Company elected not to use the practical expedient of hindsight in determining the lease term and in assessing the impairment of the Company’s operating lease right-of-use assets. The Company’s adoption of ASC 842 did not have a material effect on the consolidated financial statements for the reasons discussed below: Company acting as Lessor: As also described in Note 2(t), the Company generates its revenues from charterers for the charter hire of its vessels under time charter agreements, in which a contract is entered into for the use of a vessel for a specific period of time and a specified daily charter hire rate, or voyage charter agreements, where a contract is made in the spot market for the use of a vessel for a specific voyage at a specified freight rate per ton. The Company considered the provisions of ASC 842 and determined that its voyage charter agreements do not contain a lease because the charterer under such contracts does not have the right to control the use of the vessel since the Company, as the ship-owner, retains control over the operations of the vessel, provided also that the terms of the voyage charter are pre-determined, and any change requires the Company’s consent. On the other hand, the Company determined that its time charter agreements are leases that are governed by ASC 842 because, pursuant to the time charter agreements, (a) the vessel is an identifiable asset, (b) the Company does not have substitution rights and (c) the charterer has the right to control the use of the vessel during the term of the contract and derives economic benefits from such use. In addition, since none of the criteria for classification as sales-type leases or direct financing leases are met, the Company’s time charter agreements are classified as operating leases. The duration of the contracts that the Company is entering into depends on the market conditions, with the duration decreasing during weak market conditions. During 2019 in their majority the Company’s time charter contracts did not exceed the period of 12 months, including optional extension periods. Future minimum rental payments for the existing contracts as of December 31, 2019, are presented in Note 17 below. Upon adoption of ASC 842, the timing and recognition of earnings from time charter contracts to which the Company is party did not change from previous practice, with the exception of ballast bonuses which were recognized during the ballast leg but are now deferred and recognized over time during the charter period, as well as the deferral of certain direct costs incurred during the ballast leg that meet the required criteria for capitalization and amortize during the charter period. Included in the charter hire rate is also compensation for running the vessel, such as crewing expenses, repairs and maintenance and insurance. The Company, making use of the practical expedient for lessors, has elected not to separate the lease and non-lease components included in the time charter revenue but rather to recognize lease revenue as a combined single lease component for all time charter contracts (operating leases) as the related lease component and non-lease component have the same timing and pattern of transfer ( i.e. Company acting as Lessee: A) As already discussed in Note 1, during 2018 and 2019 the Company chartered-in a number of third-party vessels to increase its operating capacity in order to satisfy its clients’ needs. All charter-in operating leases that the Company had entered into and were effective as of December 31, 2018 and during the year ended December 31, 2019 are short to medium-term leases ( i.e B) The adoption of ASC 842 did not change the accounting for the leases already recognized on the balance sheet as capital leases under the previous leasing guidance given the transition provisions of ASC 842 and the practical expedients elected by the Company as discussed above. As such, those leases existing as of January 1, 2019, including all bareboat charter agreements that the Company had entered into that were in place as of that date, are classified as finance leases under the new leasing guidance of ASC 842, with the Company having reclassified the existing capital lease assets as of December 31, 2018 of $1,047,780 as right-of-use assets being reflected within Fixed Assets and the existing lease obligations as of December 31, 2018 of $609,737 as lease liabilities being reflected within Lease financing. The weighted-average discount rate for the Company’s bareboat charter agreements for the year ended December 31, 2019 was 5.66%. Please refer to Note 7 for the description of the nature of these leases, general terms, covenants included , any variable payments, if any, as well as the purchase obligations they provide for. C) Each sale and lease back transaction that the Company had entered into as of December 31, 2018 and during the year ended December 31, 2019, involved a purchase obligation and was therefore treated as a failed sale or merely a financing arrangement both before and after adoption of ASC 842, and therefore was not within the scope of sale and leaseback accounting. D) The Company has determined its office rental arrangements are operating leases. The office spaces that the Company leases are mostly located in Athens, Cyprus and Switzerland. Payments under these arrangements are fixed with no variable payments. The assets and liabilities recognized in respect of these agreements that correspond to the underlying rights and obligations were $1,198 as of January 1, 2019 and $1,216 as of December 31, 2019 and are presented within “Leased buildings, right-of-use assets” and “Leased buildings, operating lease liabilities” in the consolidated balance sheet. The discount rate used is 4%, being the estimated annual incremental borrowing rate for these type of assets. The lease expenses attributable to these leases are recognized on a straight line basis over the lease term and are recorded as part of General and Administrative expenses. These lease expenses were $403 and $352 for the years ended December 31, 2018 and 2019, respectively. The weighted average remaining lease term of the Company’s office rent arrangements is 3.9 years. Please also refer to Note 3 for office rent agreements entered into with related parties. Future minimum rental payments for existing contracts as of December 31, 2019, are presented in Note 17 below. y) Derivatives & Hedging: i) Derivative Financial Instruments: The Company enters into derivative and non-derivative financial instruments to manage risks related to fluctuations of interest rates and foreign currency exchange rates. All derivatives are recorded on the Company’s balance sheet as assets or liabilities and are measured at fair value. The valuation of interest rate swaps is based on Level 2 observable inputs of the fair value hierarchy, such as interest rate curves. The changes in the fair value of derivatives not qualifying for hedge accounting are recognized in earnings. Cash inflows/outflows attributed to derivative instruments are reported within cash flows from operating activities in the consolidated statements of cash flows. For the purpose of hedge accounting, hedges are classified as: · fair value hedges, when hedging the exposure to changes in the fair value of a recognized asset or liability or an unrecognized firm commitment, which in each case is attributable to a particular risk, including foreign currency risk; · cash flow hedges, when hedging exposure to variability in cash flows that is either attributable to a particular risk associated with a recognized asset or liability or a highly probable forecast transaction that could affect earnings; or · hedges of a net investment in a foreign operation. This type of hedge is not used by the Company. In case the instruments are eligible for hedge accounting, at the inception of a hedge relationship, the Company formally designates and documents the hedge relationship to which the Company wishes to apply hedge accounting and the risk management objective and strategy undertaken for the hedge. The documentation includes identification of the hedging instrument, the hedged item or transaction, the nature of the risk being hedged and how the Company will assess the hedging instrument’s effectiveness in offsetting exposure to changes in the hedged item’s cash flows or fair value attributable to the hedged risk. Such hedges are expected to be highly effective in achieving offsetting changes in cash flows or fair value and are assessed at each reporting date to determine whether they actually have been highly effective throughout the financial reporting periods for which they were designated. Fair value hedges A fair value hedge is a hedge of the exposure to changes in the fair value of a recognized asset or liability, or of an unrecognized firm commitment, which in each case is attributable to a particular risk. The change in the fair value of a hedging instrument is recognized in the consolidated statement of operations. The change in the fair value of the hedged item attributable to the risk hedged is recorded as part of the carrying value of the hedged item and is also recognized in the consolidated statement of operations. For fair value hedges, in which a non-derivative is used as hedging instrument for foreign currency risk of unrecognized firm commitments, the hedging instrument is re- measured based on the movement in functional currency cash flows attributable to the change in spot exchange rates between the functional currency and the currency in which the non-derivative hedging instrument is denominated. An asset or liability is recorded for the unrecognized firm commitment, which equals the foreign exchange gain or loss that is recorded in earnings as a result of the hedge relationship. The resulting asset or liability will eventually be treated as part of the consideration when the firm commitment is recognized. Cash Flow hedges A cash flow hedge is a hedge of the exposure to variability in cash flows that is attributable to a particular risk associated with a recognized asset or liability or a highly probable forecasted transaction that could affect earnings. For derivatives designated as cash flow hedges, the effective portion of the changes in their fair value is recorded in “Accumulated other comprehensive income / (loss)” and is subsequently recognized in earnings when the hedged items impact earnings, while the ineffective portion, if any, is recognized immediately in current period earnings under “Gain / (Loss) on derivative financial instruments, net.” Discontinuation of hedge relationships The Company discontinues prospectively fair value or cash flow hedge accounting if the hedging instrument expires or is sold, terminated or exercised and it no longer meets all the criteria for hedge accounting or if the Company de-designates the instrument as a cash flow or fair value hedge. As part of a cash flow hedge, at the time the hedging relationship is discontinued, any cumulative gain or loss on the hedging instrument recognized in equity remains in equity until the forecasted transaction occurs or until it becomes probable of not occurring. When the forecasted transaction occurs, any cumulative gain or loss on the hedging instrument is recognized in earnings. If a hedged transaction is no longer expected to occur, the net cumulative gain or loss recognized in equity is reclassified and recognized in earnings for the year. Similarly, as part of a fair value hedge, if the hedged item is derecognized, the unamortized fair value is recognized immediately in earnings. ii) Forward Freight Agreements and Bunker Swaps: In addition, from time to time, the Company may take positions in derivative instruments including forward freight agreements, or FFAs. Generally, FFAs and other derivative instruments may be used to hedge a vessel owner’s exposure to the charter market for a specified route and period of time. Upon settlement, if the contracted charter rate is less than the average of the rates for the specified route and time period, as reported by an identified index, the seller of the FFA is required to pay the buyer the settlement sum, being an amount equal to the difference between the contracted rate and the settlement rate, multiplied by the number of days in the specified period covered by the FFA. Conversely, if the contracted rate is greater than the settlement rate, the buyer is required to pay the seller the settlement sum. All of the FFAs are settled on a daily basis through reputable exchanges such as LCH, Singapore Exchange (SGX) or Nasdaq. FFAs are intended to serve as an economic hedge for the Company’s vessels that are being chartered in the spot market, effectively locking-in an approximate amount of revenue that the Company expects to receive from such vessels for the relevant periods. The Company measures the fair value of all open positions at each reporting date on this basis (Level 2). The Company’s FFAs do not qualify for hedge accounting and therefore gains or losses are recognized in the consolidated statements of operations under “(Gain)/Loss on forward freight agreements and bunker swaps.” Also, from time to time, 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. Bunker swaps are agreements between two parties to exchange cash flows at a fixed price on bunkers, where volume, time period and price are agreed in advance. The Company’s bunker swaps are settled through reputable clearing houses, including LCH. The fair value of bunker swaps is the estimated amount that the Company would receive or pay to terminate the swaps at the reporting date (Level 2). The Company’s bunker swaps do not qualify for hedge accounting and bunker price differentials paid or received under the swap agreements are recognized under “(Gain)/Loss on forward freight agreements and bunker swaps”. z) Taxation aa) Offering costs ab) Share repurchases ac) Evaluation of purchase transactions Business Combinations (Topic 805): Clarifying the Definition of a Business Other accounting pronouncements - adopted: Statement of Cash Flows (230) Recent accounting pronouncements - not yet adopted: Financial Instruments - Credit Losses (Topic 326) Fair Value Measurement (Topic 820):

Transactions with Related Parti

Transactions with Related Parties	12 Months Ended
	Dec. 31, 2019
Related Party Transactions [Abstract]
Transactions with Related Parties:	3. Transactions with Related Parties: Transactions and balances with related parties are analyzed as follows: Balance Sheet December 31, 2018 December 31, 2019 Due from related parties Oceanbulk Maritime and its affiliates (d) $ 85 $ 327 Interchart (a) - 11 AOM (l) - 195 Starocean (j) 65 41 Sellers of the Augustea Vessels (f) 867 - Songa Shipmanagement Ltd. (g) 305 - Product Shipping & Trading S.A. - 16 Due from related parties $ 1,322 $ 590 Due to related parties Management and Directors Fees (b) $ 236 $ 246 Sydelle (h), (i) 302 19 Augustea Technoservices Ltd. (f) 1,111 2,879 Coromel Maritime Limited (m) - 873 Due to related parties $ 1,649 $ 4,017 Statements of Operations Years ended December 31, 2017 2018 2019 Voyage expenses-Interchart (a) $ (3,300) $ (3,400) (3,850) Consultancy fees (b) (493) (534) (655) Directors compensation (b) (145) (159) (179) Office rent - Combine Marine Ltd. & Alma Properties (c) (39) (41) (39) Voyage revenues - profit sharing agreement-Sydelle (h) (329) (875) - Management fees- Augustea Technoservices Ltd. (f) - (2,309) (6,564) Management fees- Songa Shipmanagement Ltd. (g) - (376) (32) General and administrative expenses - Oceanbulk Maritime and its affiliates (d) (284) (322) (324) Charter - in hire expenses - AOM (l) - - (2,589) Charter - in hire expenses - Sydelle (i) - - (5,505) Charter - in hire expenses - Coromel (m) - - (5,723) Charter - in hire expenses - Eagle Bulk (n) - - (1,908) a) Interchart Shipping Inc. (or “Interchart”): In November 2014, the Company entered into a services agreement with Interchart for chartering, brokering and commercial services for all of the Company’s vessels for a monthly fee of $275, with a term until March 31, 2015, which following consecutive renewals was effective until December 31, 2018. In November 2018, the Company entered into a new service agreement with Interchart, with effect from November 1, 2018 until December 31, 2019, pursuant to which the monthly fee was increased to $325. In August 2019, the Company renewed this services agreement with effect from August 1, 2019 until December 31, 2020, pursuant to which the monthly fee decreased to $315. During the years ended December 31, 2017, 2018 and 2019 the brokerage commissions charged by Interchart were $3,300, $3,400 and $3,850, respectively, and are included in “Voyage expenses” in the consolidated statements of operations. As of December 31, 2019, the Company had outstanding receivable of $11 from Interchart, for payments made on its behalf for certain administrative items. b) Management and Directors Fees: The expenses related to the Company’s directors for the years ended December 31, 2017, 2018 and 2019 were $145, $159 and $179, respectively, and are included under “General and administrative expenses” in the consolidated statements of operations. As of December 31, 2018 and 2019, the Company had outstanding payables of $236 and $246, respectively, to its executive officers and directors representing unpaid consulting fees or unpaid fees for their participation in the Company’s Board of Directors and other special committees. c) Office rent: In addition, on December 21, 2016, Starbulk S.A., entered into a six year lease agreement for office space with Alma Properties, a company controlled by Mrs. Milena - Maria Pappas. The lease agreement provides for a monthly rental of €300 (approximately $0.3, using the exchange rate as of December 31, 2019, which was $1.12 per euro). The related rent expense for each year ended December 31, 2017, 2018 and 2019 was $4 and is included under “General and administrative expenses” in the consolidated statement of operations. d) Oceanbulk Maritime S.A. (or “Oceanbulk Maritime”): e) Oaktree Shareholder Agreement: The four directors currently designated by Oaktree are Messrs. Pappas, Balakrishnan and Laibow and Ms. Men, Under the Oaktree Shareholders Agreement, with certain limited exceptions, Oaktree effectively cannot vote more than 33% of the Company’s outstanding common shares (subject to adjustment under certain circumstances). f) Augustea Technoservices Ltd. : g) Songa Shipmanagement Ltd .: h) Sydelle Marine Limited (or “Sydelle”) - profit sharing agreement: Star Ariadne, Star Ariadne i) Sydelle Marine Limited (or “Sydelle”) – Charter in Agreement: j ) StarOcean Manning Philippines Inc. (or “Starocean”) k ) Oceanbulk Container Carriers LLC. (or “OCC”): l) Augustea Oceanbulk Maritime Malta Ltd (or “AOM”): AOM Marta AOM Marta m) Coromel Maritime Limited (or “Coromel”): n) Eagle bulk Pte. Ltd. (or “Eagle Bulk”):

Inventories

Inventories	12 Months Ended
	Dec. 31, 2019
Inventory Disclosure [Abstract]
Inventories:	4. Inventories: The amounts shown in the consolidated balance sheets are analyzed as follows: December 31, 2018 December 31, 2019 Lubricants $ 12,071 $ 12,293 Bunkers 15,365 38,860 Total $ 27,436 $ 51,153

Vessels and other fixed assets,

Vessels and other fixed assets, net	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Vessels and other fixed assets, net:	5. Vessels and other fixed assets, net: The amounts in the consolidated balance sheets are analyzed as follows: Vessel cost Accumulated depreciation Net Book Value Balance, December 31, 2017 2,186,856 -411,775 1,775,081 - Transfer from advances for vessels under construction and acquisition of vessels 163,138 - 163,138 - Acquisitions, improvements and other vessel costs 844,474 - 844,474 - Vessel disposal/ transfer to Held for sale (5,949) - (5,949) - Impairment loss (83,256) 65,472 (17,784) - Depreciation for the period - (102,852) (102,852) Balance, December 31, 2018 $ 3,105,263 $ -449,155 $ 2,656,108 - Transfer from advances for vessels under construction and acquisition of vessels 157,589 - 157,589 - Acquisitions, improvements and other vessel costs 335,671 - 335,671 - Vessel disposal (163,049) 106,899 (56,150) - Impairment loss (24,551) 21,140 (3,411) - Depreciation for the period - (124,280) (124,280) Balance, December 31, 2019 $ 3,410,923 $ (445,396) $ 2,965,527 As of December 31, 2019, 80 of the Company’s 116 vessels, having a net carrying value of $2,166,419, were subject to first-priority mortgages as collateral to their loan facilities (Note 9). The carrying value of the vessels under bareboat lease agreements as of December 31, 2019 was $798,863 (Note 7). In addition, the seven vessels financed under the ABN $115,000 Facility, the two vessels financed under the BNP Facility and the 11 vessels financed under Citi $130,000 Facility also secure the Atradius Facility on a second priority basis. Finally, the eight vessels financed under the HSBC $80,000 Facility secure on a second priority basis the HSBC Working Capital Facility. Vessels acquired/delivered/disposed of during the year ended December 31, 2018 Delivery of newbuilding and secondhand vessels: (i) On January 3, 2018, March 26, 2018 and May 14, 2018, the Company took delivery of the Newcastlemax vessels Star Eleni Star Magnanimus Star Leo (ii) During the third quarter of 2018, the Company acquired the 15 Songa Vessels and the 16 Augustea Vessels (Note 3). The Songa Vessel Purchase Transaction and the Augustea Vessel Purchase Transaction were accounted for as asset acquisitions, in accordance with ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business (iii) On August 27, 2018, the Company entered into a definitive purchase agreement with entities affiliated with E.R. Capital Holding GmbH & Cie. KG, pursuant to which the Company approved the acquisition of three dry bulk vessels (the “Step 1 Vessels”) in 2018. The first of the Step 1 Vessels, Star Bright (iv) On November 16, 2018, the Company took delivery of the Ultramax vessel Star Anna Sale of vessels/ Vessel held for sale: On November 20, 2018, the Company entered into an agreement with a third party to sell the vessel Star Delta. The vessel was delivered to its new owner on January 8, 2019. As of December 31, 2018, the vessel met the criteria for classification as held for sale and is therefore separately presented within “Vessels held for sale” in the consolidated balance sheet, at agreed selling price less cost to sell. In addition, as of December 31, 2018, as part of its strategic goal to dispose the older vessels in its fleet, the Company was in negotiations for the sale of the vessels Star Kappa and Star Aurora. The Company executed the respective sale agreements with third parties in February 2019 (discussed below). None of these two vessels met the criteria to be classified as held for sale as of December 31, 2018. Vessels acquired/delivered during the year ended December 31, 2019 Delivery of newbuilding and secondhand vessels: i) On April 16, 2019, May 28, 2019 and July 15, 2019, the Company took delivery of the Newcastlemax vessels Katie K Debbie H Star Ayesha ii) On January 7 and 14, 2019, the Company took delivery of the Capesize vessels Star Janni Star Marianne, Star Janni Star Marianne, iii) On May 27, 2019, the Company entered into an en bloc definitive agreement with entities controlled by Delphin Shipping, LLC (“Delphin”), an entity affiliated with Kelso & Company, pursuant to which it agreed to acquire 11 operating dry bulk vessels (the “Delphin Vessels”). The vessels were delivered to the Company in exchange for an aggregate of 4,503,370 of its common shares and cash consideration of $80,000, with the total acquisition cost being $127,532. The cash consideration was financed through proceeds from a new seven-year finance lease of $91,431 with China Merchants Bank Leasing (“CMBL”) (Note 7). All 11 Delphin Vessels were delivered to the Company during the third quarter of 2019. The cost of the shares issued in connection with the acquisition of Delphin Vessels was determined by reference to the Company’s closing share market prices on each delivery date of the Delphin Vessels. Sale of vessels: In February 2019, the Company entered into two separate agreements with third parties to sell the vessels Star Kappa Star Aurora Star Anna Star Gamma Star Cosmo Star Epsilon The Company decided to sell the respective vessels as part of its strategic goal to dispose the older vessels in its fleet. In connection with the aforementioned sales in 2019 and the delivery to the sellers of the vessel Star Delta (discussed above) Impairment Analysis In light of the economic downturn and the prevailing conditions in the shipping industry, as of December 31, 2017, 2018 and 2019, the Company performed an impairment analysis for each of its operating vessels whose carrying value was above its market value and for each newbuilding (for 2017 and 2018) whose cost on a fully delivered basis, was above its market value. As part of the agreed and intended sales in 2018, as described above, and by reference to their agreed or negotiated sale prices (Level 2), the Company recognized an impairment loss of $17,784, for the year ended December 31, 2018, which is separately reflected in the consolidated statement of operations (Note 19). Further to that, based on the Company’s impairment analysis no further impairment loss was considered necessary for the year ended December 31, 2018. In connection with the sale of Star Gamma and Star Anna in 2019 (discussed above), the Company recognized an aggregate impairment loss of $3,411. The Company’s annual impairment analysis for the year ended December 31, 2019, did not result in any additional impairment charges.

Advances for vessels under cons

Advances for vessels under construction and acquisition of vessels	12 Months Ended
	Dec. 31, 2019
Advances for vessels under construction and acquisition of vessels [Abstract]
Advances for vessels under construction and acquisition of vessels:	6. Advances for vessels under construction and acquisition of vessels: The amounts in the consolidated balance sheets are analyzed as follows: Balance, December 31, 2017 $ 48,574 - Additions 129,749 - OCC Vessels shares acquisition 42,962 - Capitalized interest 1,753 - Transfers to Vessel cost (163,138) Balance, December 31, 2018 59,900 - Additions 96,671 - Capitalized interest 1,018 - Transfers to Vessel cost (157,589) Balance, December 31, 2019 - As of December 31, 2018, the Company had three vessels under construction, the OCC Vessels (Note 3), which were financed under bareboat leases with CSSC (Note 7). During 2018, the Company paid for those vessels $42,962 by issuance of shares and also paid cash of $4,350 each for the third installments for two of the OCC Vessels. In connection with the Step 1 Vessels, Star Marianne and Star Janni, which were delivered to the Company in January 2019 (Note 5), the Company as of December 31, 2018, had paid an amount of $4,880 which is included in “Advances for vessels under construction and acquisition of vessels” in the consolidated balance sheet. As of December 31, 2019, there were no vessels under construction nor any pending acquisition of vessels.

Lease financing

Lease financing	12 Months Ended
	Dec. 31, 2019
Lease Financing
Lease financing:	7. Lease Commitments: New financing through bareboat leases during the year ended December 31, 2019: On March 29, 2019, the Company entered into an agreement to sell Star Pisces to SK Shipholding S.A. and simultaneously entered into a seven-year bareboat charter for the vessel. Pursuant to the terms of the bareboat charter, the Company pays a daily bareboat charter hire rate monthly plus interest, and the Company has an option to purchase the vessel starting on the third anniversary of the vessel’s delivery to the Company at a pre-determined, amortizing purchase price. The Company also has an obligation to purchase the vessel at the expiration of the bareboat term at a purchase price of $7,628. The amount of $19,125 provided under the agreement which was concluded in April 2019, was used to pay the remaining amount of $11,671 under the NIBC $32,000 Facility (Note 9). On May 22, 2019, the Company entered into an agreement to sell Star Libra to Ocean Trust Co. Ltd. and simultaneously entered into a seven-year bareboat charter for the vessel. Pursuant to the terms of the bareboat charter, the Company pays a daily bareboat charter hire rate quarterly plus interest, and the Company has an option to purchase the vessel at any time after the vessel’s delivery to the Company at a pre-determined, amortizing purchase price. The Company also has an obligation to purchase the vessel at the expiration of the bareboat term at a purchase price of $18,107. The amount of $33,950 provided under the agreement which was concluded in July 2019, was used to pay the remaining amount under the previous lease agreement for Star Libra with CSSC. On July 10, 2019, the Company entered into an agreement to sell Star Challenger to Kyowa Sansho Co. Ltd. and simultaneously entered into an eleven-year bareboat charter party for the vessel. Pursuant to the terms of the bareboat charter, the Company pays a daily bareboat charter hire rate monthly plus a variable amount and the Company has an option to purchase the vessel starting on the third anniversary of vessel’s delivery to the Company at a pre-determined, amortizing purchase price. The Company also has an obligation to purchase the vessel at the expiration of the bareboat term. The amount of $15,000 provided under the agreement was used to pay the remaining amount of approximately $10,874 under the then existing loan agreement with HSH. In order to finance the cash portion of the consideration for the acquisition of the Delphin Vessels (Note 5), in July 2019, the Company entered, for each of the subject vessels, into an agreement to sell each such vessel and simultaneously entered into a seven-year bareboat charter party contract with affiliates of CMBL for the vessel upon delivery of the vessel from Delphin. CMBL agreed to provide an aggregate finance amount of $91,431. Pursuant to the terms of each bareboat charter, the Company pays CMBL a fixed bareboat charter hire rate in quarterly installments plus interest. Under the terms of the bareboat charter, the Company has options to purchase each vessel starting on the first anniversary of such vessel’s delivery to the Company, at a pre-determined, amortizing purchase price, while it has an obligation to purchase each vessel at the expiration of the bareboat term at a purchase price ranging from $975 to $3,379. In addition the Company has obtained exhaust gas cleaning systems (the “Delphin Scrubbers”) for all of the Delphin Vessels which will be financed through an additional amount of $15,000, in aggregate, under the bareboat charter party contracts mentioned above. As of December 31, 2019 no amount for Delphin Scrubbers had been drawn. Pre- existing financing through bareboat leases: The Company is party to separate bareboat charter party contracts with affiliates of New Yangzijiang shipyard regarding the Ultramax vessels Idee Fixe, Roberta, Laura and Kaley. Pursuant to the terms of each bareboat charter, the Company pays New Yangzijiang a pre-agreed daily bareboat charter hire rate on a 30-days advance basis. In addition, the Company has monthly purchase options to acquire each vessel at a pre-determined, amortizing-during-the-charter-period price. On the eighth anniversary of the delivery of each vessel, the Company has the obligation to purchase the vessel at a purchase price of $6,000. The Company took delivery of these four vessels during the year ended December 31, 2015. In order to finance the cash portion of the consideration related to the Songa Vessel Purchase Transaction (Note 5), in July 2018, the Company entered, for each of the subject vessels, into an agreement to sell each such vessel and simultaneously entered into a bareboat charter party contract with affiliates of CMBL to bareboat charter the vessel for five years upon delivery of the vessel from Songa. CMBL agreed to provide an aggregate finance amount of $180,000; $19,600 to be used to finance the acquisition and installation of exhaust gas cleaning systems for the respective vessels (the “Songa Scrubbers”). Pursuant to the terms of each bareboat charter, the Company pays CMBL a fixed bareboat charter hire rate in quarterly installments plus interest. Under the terms of the bareboat charter, the Company has options to purchase each vessel starting on the second anniversary of such vessel’s delivery to the Company, at a pre-determined, amortizing purchase price, while it has an obligation to purchase each vessel at the expiration of the bareboat term at a purchase price ranging from $2,200 to $8,400. In September and November 2019, the Company drew a total amount of $12,165 out of $19,600 total available amount provided by CMBL for the Songa Scrubbers. On September 27, 2018, the Company entered, into an agreement to sell the vessels Star Eleni and Star Leo and simultaneously entered into two bareboat charter party contracts with affiliates of CMBL to bareboat charter each one of the respective vessels for five years. CMBL provided in aggregate a finance amount of $57,346, which the Company used to repay the outstanding amount of $58,112 in aggregate, under the then-existing lease agreements of the two vessels with CSSC. Pursuant to the terms of the bareboat charters, the Company pays CMBL a fixed bareboat charter hire rate in quarterly installments plus interest. Under the terms of the bareboat charters, the Company has options to purchase the vessels from year two onwards each at a pre-determined, amortizing purchase price, while it has an obligation to purchase the vessel at the expiration of the bareboat term at a purchase price of $18,231 for vessel Star Eleni and $20,000 for vessel Star Leo. In December 2018, the Company sold and simultaneously entered into a bareboat charter party contract with an affiliate of Kyowa Sansho to bareboat charter the vessel Star Fighter for ten years. Pursuant to the terms of the bareboat charter, the Company pays a daily bareboat charter hire rate payable monthly plus a variable amount. Under the terms of the bareboat charter, the Company has an option to purchase the vessel starting on the third anniversary of the vessel’s delivery to the Company at a pre-determined, amortizing purchases price, while it has an obligation to purchase the vessel at the expiration of the bareboat term at a purchase price of $2,450. The amount of $16,125 provided under the respective agreement was used to pay the remaining amount of approximately $11,958 under the then-existing loan agreement with HSH. During the twelve-month period ended December 31, 2019, the Company repaid the outstanding amounts under the lease agreements of Star Magnanimus, Star Ariadne, Star Laetitia, Star Sienna, Star Virgo, Star Marisa, Star Karlie, Katie K, Debbie H and Star Ayesha with CSSC. The lease agreements were refinanced with the proceeds from the following loan facilities: (i) ING $100,600 Facility, (ii) E.SUN Facility, (iii) SEB Facility, (iv) Citibank $62,600 Facility, (v) CTBC Facility and (vi) CEXIM $106,470 Facility. In addition the Company repaid the outstanding amount under the lease agreement of Star Alessia (ex-ABY Asia) using the amount drawn under the ING $100,600 Facility (Note 9). Some of the Company’s bareboat lease agreements contain financial covenants similar to those included in the Company’s credit facilities described in detail in Note 9 below. Based on applicable accounting guidance, the Company determined that the sale and lease back transactions described above are in substance merely financing arrangements due to the accompanying purchase obligations included in the Company’s bareboat agreements and therefore did not derecognize the transferred vessels while the corresponding financing amount under the bareboat agreements was recorded as lease liability and presented as Lease financing. The remaining bareboat lease arrangements have been classified as finance leases and as a result, in accordance with the applicable lease accounting guidance (Note 2), the Company as lessee has recognized a right-of-use asset for each bareboat charter reflected within “Vessels and other fixed assets, net” and a corresponding lease liability being reflected within “Lease financing”. As of December 31, 2018 and 2019, the net book value of the bareboat chartered vessels, described above, was $992,777 and $798,863, respectively, with accumulated amortization of $51,956, and $72,555 respectively. In addition, the depreciation and amortization, respectively, of these bareboat chartered vessels is included within “Depreciation expense” in the consolidated statement of operations. The corresponding interest expense on the lease financing activities related to all bareboat charters for the years December 31, 2017, 2018 and 2019 was $12,590, $26,825 and $27,251, respectively, and is included within “Interest and finance costs” in the consolidated statement of operations. The payments made during the years ended December 31, 2017, 2018 and 2019, in connection with the Company’s bareboat leases including lease payments, prepayments due to refinancing and lease interest were $20,985, $113,865 and $478,807, respectively. The payments required to be made after December 31, 2019, for the outstanding bareboat lease obligations recognized on the balance sheet, as described above (the variable portion of which is based on the 3-month LIBOR of 1.908% as of December 31, 2019), are as follows: Twelve month periods ending Amount December 31, 2020 $ 69,820 December 31, 2021 68,255 December 31, 2022 66,144 December 31, 2023 137,160 December 31, 2024 25,809 December 31, 2025 and thereafter 122,318 Total bareboat lease minimum payments $ 489,506 Unamortized debt issuance costs (3,936) Total bareboat lease minimum payments, net $ 485,570 Excluding bareboat lease interest (63,594) Lease commitments – short term 52,145 Lease commitments – long term 369,831

Fair value of Above _ Below Mar

Fair value of Above / Below Market Acquired Time Charters	12 Months Ended
	Dec. 31, 2019
Fair Value Of Above Below Market Acquired Time Charters
Fair Value of Above-Market Acquired Time Charters:	8. Fair value of Above / Below Market Acquired Time Charters: For two Augustea Vessels, which were transferred to the Company with time charter agreements attached, the Company recognized a liability of $5,373, since it determined that the respective charter rates were below market rates on the date of the transfers (Level 2). For the years ended December 31, 2018 and 2019, the amortization of fair value of the below market acquired time charters was $1,820 and $1,337, respectively, and is included under “Voyage revenues” in the consolidated statements of operations. The accumulated amortization of these below market time charters as of December 31, 2019 was $3,157. As part of the Step 1 Acquisition of the E.R. Vessels, the Company took delivery of the vessels Star Marianne and Star Janni (Note 5) with time charter agreements attached. The Company recognized a liability of $1,269 and an asset of $336, since it was determined that the charter rate of Star Marianne was below market rates and of Star Janni was above market rates on the date of each vessel’s delivery (Level 2). For the year ended December 31, 2019, the amortization of fair value of the below market acquired time charter was $1,012, and the amortization of fair value of the above market acquired time charter was $336, which amounts are included under “Voyage revenues” in the consolidated statement of operations. As of December 31, 2019, the intangible asset recognized in connection with the attached time charter agreement of Star Janni had been fully amortized, and the unamortized balance of the intangible liabilities described above was $2,473 and is expected to be amortized over a weighted average period of 2.17 years as follows: Twelve month periods ending Amount December 31, 2020 $ 1,184 December 31, 2021 924 December 31, 2022 365 Total $ 2,473

Long-term debt

Long-term debt	12 Months Ended
	Dec. 31, 2019
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term Debt:	9. Long-term debt: New Financing Activities during the year ended December 31, 2019 i) SEB Facility: On January 28, 2019, the Company entered into a loan agreement with Skandinaviska Enskilda Banken AB (SEB), (the “SEB Facility”), for the financing of an amount up to $71,420. The facility is available in four tranches. The first two tranches of $32,825 each were drawn on January 30, 2019 and used together with cash on hand to refinance the outstanding amounts under the lease agreements of Star Laetitia Star Sienna Star Sienna ii) E SUN Facility: On January 31, 2019, the Company entered into a loan agreement with E. SUN Commercial Bank, Hong Kong branch, (the “E.SUN Facility”), for the financing of an amount of $37,100 which was used to refinance the outstanding amount under the lease agreement of Star Ariadne Star Ariadne iii) Atradius Facility: On February 28, 2019, the Company entered into a loan agreement with ABN AMRO Bank N.V. (the “Atradius Facility”) for the financing of an amount up to $36,645 that is to be used to finance the acquisition and installation of scrubber equipment for 42 vessels. The financing is credit insured (85%) by Atradius Dutch State Business N.V. of the Netherlands (the “Atradius”). As of December 31, 2019, three tranches of $33,311 in aggregate were drawn and the last tranche of $3,331 was drawn in January 2020. The facility is repayable in 10 consecutive semi-annual installments of $3,664 and is secured by a second-priority mortgage on 22 vessels of the Company’s fleet. iv) ING $100,600 Facility: On March 28, 2019, the Company entered into an amended and restated facility agreement with ING Bank N.V., London Branch, the “ING $100,600 Facility”, in order to increase the financing by $52,800 and to include additional borrowers under the existing ING $47,800 Facility. The additional financing amount of $52,800 is available in four tranches. The first two tranches of $32,100 and $17,400, respectively, were drawn in March 2019 and April 2019, respectively and used to refinance the outstanding amounts under the lease agreements of Star Magnanimus Star Alessia Peloreus Leviathan Peloreus Leviathan Peloreus Leviathan Star Magnanimus Star Alessia v) Citibank $62,600 Facility: On May 8, 2019, the Company entered into a loan agreement with Citibank N.A., London Branch (the “Citibank $62,600 Facility”). In May 2019, the Company drew the aggregate amount of $62,563, which was used, together with cash on hand, to refinance the outstanding amounts under the lease agreements of Star Virgo Star Marisa vi) CTBC Facility: On May 24, 2019, the Company entered into a loan agreement with CTBC Bank Co., Ltd, (the “CTBC Facility”), for an amount of $35,000, which was used to refinance the outstanding amount under the lease agreement of the Star Karlie vii) NTT Facility: On July 31, 2019, the Company entered into a loan agreement with a wholly owned subsidiary of NTT Finance Corporation (the “NTT Facility”), for an amount of $17,500. The amount was drawn in August 2019 and was used to refinance the outstanding amount of $11,161 of Star Aquarius Star Aquarius viii) CEXIM $106,470 Facility: On September 23, 2019, the Company entered into a loan agreement with China Export-Import Bank (the “CEXIM $106,470 Facility”) for an amount of $106,470, which was used to refinance the outstanding amount under the lease agreements of Katie K Debbie H Star Ayesha (Note 7). ix) HSBC Working Capital Facility: In September 2019, the Company entered into a committed term sheet with HSBC France for a revolving facility of an amount up to $30,000 (the “HSBC Working Capital Facility”), in order to finance working capital requirements. The agreement is secured by second priority mortgage on the eight vessels which secure the HSBC $80,000 Facility. The execution of customary definitive documentation was made on February 6, 2020 (Note 21). Pre - Existing Loan Facilities i) NBG $30,000 Facility: On April 19, 2018, the Company entered into a loan agreement with the National Bank of Greece (the “NBG $30,000 Facility”), for the refinancing of the then existing agreement with Commerzbank (the “Commerzbank $120,000 Facility”). On May 3, 2018, the Company drew $30,000 under the NBG $30,000 Facility, which was used along with cash on hand to fully repay the outstanding amount of $34,726 under the Commerzbank $120,000 Facility . Star Theta Star Iris. ii) Credit Agricole $43,000 Facility: On August 21, 2018, the Company entered into a loan agreement with Credit Agricole Corporate and Investment Bank (the “Credit Agricole $43,000 Facility”) for the financing of an aggregate amount of $43,000, to refinance the outstanding amount of $44,100 under the then existing agreement with Credit Agricole (the “Credit Agricole $70,000 Facility”). The amount of $43,000 was drawn on August 23, 2018, in two equal tranches of $21,500, each being repayable in 20 equal quarterly installments of $625 and a balloon payment of $9,000, payable together with the last installment. The facility is secured by the vessels Star Borealis Star Polaris iii) HSBC $80,000 Facility: On September 26, 2018, the Company entered into a loan agreement with HSBC Bank plc (the “HSBC $80,000 Facility”) to refinance the aggregate outstanding amount of $74,647 under the then existing agreement with HSH Nordbank (the “HSH Nordbank $64,500 Facility”) and with HSBC Bank plc (the “HSBC $86,600 Facility”). The amount of $80,000 was drawn on September 28, 2018. During 2019, an amount of $7,505 in aggregate, was prepaid in connection with the sale of two vessels under the HSBC $80,000 Facility (Note 5) and the quarterly installments were amended to $2,140 and the final balloon payment, which is payable together with the last installment in August 2023, was amended to $29,095. As of December 31, 2019, the facility is secured by the vessels Kymopolia Mercurial Virgo Pendulum Amami Madredeus Star Emily, Star Omicron Star Zeta iv) DNB $310,000 Facility: On September 27, 2018, the Company entered into a loan agreement with DNB Bank ASA (the “DNB $310,000 Facility”), for an amount of up to $310,000, available in two tranches. The first tranche of $240,000 was used to refinance the aggregate outstanding amount of $240,440 under the then existing facilities with (i) ABN AMRO (the “ABN $87,458 Facility”), (ii) DNB, SEB and CEXIM (the “DNB-SEB-CEXIM $227,500 Facility”), (iii) DNB (the “DNB $120,000 Facility”), (iv) Deutsche Bank AG (the “Deutsche Bank AG $39,000 Facility”) and (v) ABN AMRO Bank N.V.(the “ABN AMRO Bank N.V $30,844 Facility”). The loan is secured by a first priority mortgage on Big Bang, Strange Attractor, Big Fish Pantagruel Gargantua Goliath Maharaj Star Poseidon Star Nasia Diva, Star Danai, Star Renee, Star Markella, Star Laura, Star Moira, Star Jennifer Star Mariella, Star Helena Star Maria Star Sirius Star Vega Star Triumph Star Charis Star Suzanna Star Angelina Star Gwyneth v) Citi $130,000 Facility: On October 18, 2018, the Company entered into a loan agreement with Citibank N.A., London Branch (the “Citi $130,000 Facility”) for an amount of up to $130,000, to refinance the aggregate outstanding amount of $100,075 under the then existing agreement with Citibank N.A., London Branch (the “Citi Facility”) and the existing indebtedness of five of the Augustea Vessels (as described below). The amount under Citi $130,000 Facility was available in two equal tranches of $65,000, which were drawn on October 23, 2018 and November 5, 2018. Each tranche is repayable in 20 equal quarterly installments of $1,825, commencing in January 2019, and a balloon payment along with the last installment in an amount of $28,500. The Citi $130,000 Facility is secured by a first priority mortgage on the vessels Star Pauline Star Angie Star Sophia Star Georgia Star Kamila Star Nina Star Eva Paola Star Aphrodite Star Lydia Star Nicole. vi) ABN $115,000 Facility: On December 17, 2018, the Company entered into a loan agreement with ABN AMRO BANK (the “ABN $115,000 Facility”), for an amount of up to $115,000 available in four tranches. The first and the second tranches of $69,525 and $7,900, respectively, were drawn on December 20, 2018. The first tranche was used to refinance the then existing indebtedness of four of the Augustea Vessels Star Virginia, Star Scarlett, Star Jeannette Star Audrey Star Bright Star Marianne Star Janni vii) DVB $24,750 Facility: On October 30, 2014, the Company and DVB Bank SE, Frankfurt entered into an agreement with respect to a credit facility (the “DVB $24,750 Facility”), to partially finance the acquisition of 100% of the equity interests of Christine Shipco LLC, which is the owner of the vessel Star Martha viii) Sinosure Facility: On February 11, 2015, the Company and Deutsche Bank (China) Co., Ltd. Beijing Branch and HSBC Bank plc entered into six seperate agreements with respect to credit facilities (the “Sinosure Facility”) for the financing of an aggregate amount of $98,165 to partially finance the construction cost of the newbuilding vessels, Honey Badger Wolverine Star Antares Star Lutas Kennadi Mackenzie Honey Badger Wolverine Star Antares . Star Lutas and Kennadi Mackenzie ix) Assumed debt as part of the acquisition of Augustea Vessels: As part of the acquisition of the Augustea Vessels the Company assumed debt of approximately $308,279 including finance lease obligations of $127,101 through bareboat leases for four of the Augustea vessels. During the fourth quarter of 2018, the Company used proceeds from (i) the second tranche of Citi $130,000 Facility to refinance the aggregate outstanding amount of $60,790 under the then existing agreement with Credit Suisse for five Augustea Vessels and (ii) the first tranche of ABN $115,000 Facility to refinance the aggregate outstanding amount of $69,907 under the then existing agreement with ABN AMRO for four Augustea Vessels. The remaining three Augustea vessels are financed under the two loan agreements described below: a) BNP Facility: BNP Paribas provided financing under secured term loan agreement in two tranches, for the vessels Star Despoina Pierra b) Bank of Tokyo Facility: Bank of Tokyo provided financing under secured term loan agreement for the vessel Star Monica Star Monica x) Issuance of 8.30% 2022 Notes: On November 9, 2017, the Company completed a public offering of $50,000 aggregate principal amount of senior unsecured notes due in 2022 (the “2022 Notes”). The 2022 Notes will mature on November 15, 2022. The 2022 Notes are not guaranteed by any of the Company’s subsidiaries and bear interest at a rate of 8.30% per year, payable quarterly in arrears on the 15th day of February, May, August and November commencing on February 15, 2018. The Company may redeem the 2022 Notes at its option, in whole or in part, at any time after May 15, 2019, at a redemption price equal to 100% of the principal amount of the 2022 Notes to be redeemed plus accrued and unpaid interest. In addition, the Company may redeem the 2022 Notes in whole, but not in part, at any time at its option, at a redemption price equal to 100% of the principal amount to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date, if certain events occur involving changes in taxation. In December 2017 the Company used the proceeds from the sale of the 2022 Notes to redeem in full the $50,000 aggregate principal amount of 8.00% Senior Notes due in 2019 (the “2019 Notes”) that had been issued in November 2014. Scrubber Financing: During the year ended December 31, 2019, the Company drew down an amount of (i) $33,311 under the Atradius Facility, (ii) $51,202 under the DNB $310,000 Facility, (iii) $1,260 under the SEB Facility, (iv) $5,600 under the ING $100,600 Facility and (v) $12,165 under the CMBL facility (Note 7), to finance the acquisition and installation of scrubber equipment for 10 Songa Vessels. As of December 31, 2019, the undrawn portion of scrubber-related financing under all facilities following these drawdowns stands at $46,227. Supplemental Agreements executed during the year ended December 31, 2016 In July 2017, the Company finalized the execution of all supplemental agreements as per the restructuring letter agreements that it entered into as of August 31, 2016 with all the banks and export credit agencies (the “Supplemental Agreements”) providing at that time its senior credit facilities to, among other things, (i) defer principal payments owed from June 1, 2016 through June 30, 2018 to the due date of the balloon installments of each facility (the “ Deferred Amounts”), (ii) waive in full or substantially relax the financial covenants, effective during the period until and including December 31, 2019 and (iii) implement a cash sweep mechanism pursuant to which excess cash at consolidated level will be applied towards the payment of Deferred Amounts, payable pro rata In accordance with the terms of the Supplemental Agreements, in 2017 the Company distributed pro rata to all parties under the Restructuring (including the lease provider): an amount of $9,768. During the year ended December 31, 2018, the Company made the following payments: (i) in February 2018, an amount of $35,632, representing the excess cash resulting from the cash sweep mechanism as of December 31, 2017, (ii) in May and July 2018 an amount of $30,000 and $22,723, respectively, representing the repayments that were in total at least equivalent to the amortization payments scheduled prior to the commencement of debt amortization holidays for the first and second quarter 2018, as decided by the Company in light of its then improved performance and the improved dry bulk market in general and (iii) in October 2018, the Company repaid all outstanding Deferred Amounts that had been accumulated from June 1, 2016 through September 30, 2018 and were still outstanding. All of the Company’s aforementioned facilities are secured by a first-priority ship mortgage on the financed vessels under each facility and general and specific assignments and guaranteed by Star Bulk Carriers Corp except for the Citi $130,000 Facility and BNP Facility which are also guaranteed by Star ABY LLC and the Bank of Tokyo Facility which is only guaranteed by Star ABY LLC. Credit Facilities and Senior Notes Covenants: The Company’s outstanding credit facilities and senior notes generally contain customary affirmative and negative covenants, on a subsidiary level, including limitations to: • pay dividends if there is an event of default under the Company’s credit facilities; • incur additional indebtedness, including the issuance of guarantees, refinance or prepay any indebtedness, unless certain conditions exist; • create liens on Company’s assets, unless otherwise permitted under Company’s credit facilities; • change the flag, class or management of Company’s vessels or terminate or materially amend the management agreement relating to each vessel; • acquire new or sell vessels, unless certain conditions exist; • merge or consolidate with, or transfer all or substantially all Company’s assets to, another person; or • enter into a new line of business. Furthermore, the Company’s credit facilities and senior notes contain financial covenants requiring the Company to maintain various financial ratios, including: • a minimum percentage of aggregate vessel value to secured loans (security cover ratio or “SCR”); • a maximum ratio of total liabilities to market value adjusted total assets; • a minimum EBITDA to interest coverage ratio; • a minimum liquidity; and • a minimum market value adjusted net worth. As of December 31, 2018 and 2019, the Company was required to maintain minimum liquidity, not legally restricted, of $53,500 and $58,000, respectively, which is included within “Cash and cash equivalents” in the consolidated balance sheets. In addition, as of December 31, 2018 and 2019, the Company was required to maintain minimum liquidity, legally restricted, of $8,956 and $ 8,443, respectively, which is included within “Restricted cash” current and non-current, in the consolidated balance sheets. As of December 31, 2019, the Company was in compliance with the applicable financial and other covenants contained in its debt agreements, including the 2022 Notes. The weighted average interest rate (including the margin) related to the Company’s existing debt, 2019 Notes and 2022 Notes and bareboat leases for the years ended December 31, 2017, 2018 and 2019 was 4.72%, 5.59% and 5.28%, respectively. The commitment fees incurred during the years ended December 31, 2017, 2018 and 2019, with regards to the Company’s unused credit facilities were $6, $1,049 and $806, respectively. There are also no undrawn portions as of December 31, 2019 other than those described under the scrubber-related financing discussed above. The principal payments required to be made after December 31, 2019, are as follows: Twelve month periods ending Amount December 31, 2020 $ 150,350 December 31, 2021 144,621 December 31, 2022 166,764 December 31, 2023 361,263 December 31, 2024 116,272 December 31, 2025 and thereafter 186,767 Total Long term debt $ 1,126,037 Unamortized debt issuance costs (15,098) Total Long term debt, net $ 1,110,939 Current portion of long term debt 150,350 Long term debt, net 960,589 The 2022 Notes mature in November 2022 and are presented in the consolidated balance sheets as of December 31, 2019, net of unamortized debt issuance costs of $1,179. All of the Company’s bank loans and applicable bareboat leases bear interest at LIBOR plus a margin. The amounts of “Interest and finance costs” included in the consolidated statements of operations are analyzed as follows: Years ended December 31, 2017 2018 2019 Interest on financing agreements $ 48,814 $ 69,977 $ 81,393 Less: Interest capitalized (2,423) (1,753) (1,018) Reclassification adjustments of interest rate swap loss/(gain) transferred to Interest and finance costs from Other Comprehensive Income (Note 18) 852 (3) - Amortization of debt issuance costs 2,660 3,253 5,590 Other bank and finance charges 555 2,241 1,652 Interest and finance costs $ 50,458 $ 73,715 $ 87,617 During the years ended December 31, 2017, 2018 and 2019, in connection with the prepayments described above and of lease obligations discussed in Note 7, following (i) the sale of mortgaged vessels, (ii) the cancellation of certain loan commitments, (iii) the refinancing agreements entered into in 2018 and 2019 and (iv) the redemption of the 2019 Notes, as applicable, $1,257, $2,383 and $1,229, respectively, of unamortized debt issuance costs were written off and included under “Loss on debt extinguishment” in the consolidated statements of operations. During the year ended December 31, 2019, $2,297 of prepayment fees were incurred for facilities refinanced or repaid as a result of the sale of mortgaged vessels which are also included under “Loss on debt extinguishment” in the consolidated statements of operations.

Preferred, Common Stock and Add

Preferred, Common Stock and Additional paid in capital	12 Months Ended
	Dec. 31, 2019
Stockholders' Equity Note [Abstract]
Preferred, Common Stock and Additional paid in capital	10. Preferred, Common Shares and Additional paid in capital: Preferred Shares: Common Shares: Each outstanding share of the Company’s common shares entitles the holder to one vote on all matters submitted to a vote of shareholders. Subject to preferences that may be applicable to any outstanding preferred shares, holders of common shares are entitled to ratably receive all dividends, if any, declared by the Company’s Board of Directors out of funds legally available for dividends. Holders of common shares do not have conversion, redemption or preemptive rights to subscribe to any of the Company’s securities. All outstanding common shares are fully paid and non-assessable. The rights, preferences and privileges of holders of common shares are subject to the rights of the holders of any preferred shares which the Company may issue in the future. On February 2, 2017, the Company completed a private placement of 6,310,272 common shares, at a price of $8.154 per share (the “February 2017 Private Placement”), raised for general corporate purposes. The aggregate proceeds to the Company, net of private placement agent’s fees and expenses, were approximately $50,427. One of the Company’s significant shareholders, Oaktree and its affiliates, purchased a total of 3,244,292 of the common shares in the February 2017 Private Placement. During the year ended December 31, 2017 the Company issued 1,220,825 common shares to the Company’s directors and employees in connection with its equity incentive plans (Note 13). On June 29, 2018, a fund affiliated with Oaktree Capital Management, L.P. completed an underwritten secondary sale of 5,000,000 common shares of the Company at a price of $13.10 per share. The Company did not sell any common shares and did not receive any proceeds as a result of this secondary sale. In addition, in September 2018, the Company filed a new shelf registration statement, which included all selling shareholders that had registration rights. In connection with these transactions the Company incurred and accrued aggregate offering expenses of $2,032, which are separately presented in the consolidated statement of shareholders’ equity for the year ended December 31, 2018. As further discussed in Note 3, during the year ended December 31, 2018, the Company issued 3,304,735 common shares, 13,725,000 common shares and 10,331,313 common shares in connection with the OCC Vessel Purchase Transaction, Songa Vessel Purchase Transaction and Augustea Vessel Purchase Transaction, respectively. In addition, pursuant to the post-closing adjustments set forth in the underlying agreement, in October 2018, the Company cancelled 53,978 common shares out of those issued as part of the consideration for the Augustea Vessel Purchase Transaction, reducing the total shares consideration issued in connection with the Augustea Vessel Purchase Transaction to 10,277,335. Lastly, in October 2018 the Company issued 291,300 common shares in connection with the acquisition of Star Bright In addition during the year ended December 31, 2018, the Company issued 868,975 common shares to the Company’s directors and employees in connection with its equity incentive plans (Note 13). On November 29, 2018, the Company announced a share repurchase program to purchase up to an aggregate of $50.0 million of the Company’s common shares. The timing and amount of any repurchases will be in the sole discretion of the Company’s management team, and will depend on legal requirements, market conditions, share price, alternative uses of capital and other factors. The Company is not obligated under the terms of the program to repurchase any of its common shares. The repurchase program has no expiration date and may be suspended or terminated by the Company at any time without prior notice. Common shares repurchases as part of this program will be cancelled by the Company. Pursuant to this share repurchase program, during the fourth quarter of 2018, the Company repurchased 341,363 of its common shares in open market transactions at an average price of $9.17 for an aggregate consideration of $3,131. All the aforementioned repurchased shares were canceled and removed from the Company’s share capital on January 3, 2019. As part of the Company’s share repurchase program, during the twelve month period ended December 31, 2019, the Company repurchased 1,020,000 shares from a non-related party shareholder in a private transaction at a price of $8.40 per share, for an aggregate consideration of $8.6 million and 1,579,195 shares in open market transactions at an average price of $7.49 for an aggregate consideration of $11,831. The repurchased shares were cancelled and removed from the Company’s share capital as of December 31, 2019. In January 2019, the Company issued 999,336 common shares in connection with the acquisition of Star Janni Star Marianne As further discussed in Note 5, during the year ended December 31, 2019, the Company issued 4,503,370 shares in connection with the acquisition of the Delphin Vessels. During the year ended December 31, 2019, the Company issued 883,700 shares to the Company’s directors and employees in connection with its equity incentive plans (Note 13). On November 20, 2019, the Company’s Board of Directors declared a cash dividend of $4,804 (or $0.05 per share) for the third quarter 2019, in line with the dividend policy established in November 2019. The total dividend amount was paid in December 2019.

Other operational gain

Other operational gain	12 Months Ended
	Dec. 31, 2019
Component of Operating Income [Abstract]
Other operational gain	11. Other operational gain: For the year ended December 31, 2017, other operational gain of $2,918 was recognized mainly consisting of an amount of $2,139, resulting from a cash settlement of a commercial dispute and gain from hull and machinery insurance claims. For the year ended December 31, 2019, other operational gain of $2,423, was recognized, mainly consisting of gain from hull and machinery insurance claims.

Management fees

Management fees	12 Months Ended
	Dec. 31, 2019
Property Management Fee [Abstract]
Management fees	12. Management fees: As of January 1, 2015, the Company engaged Ship Procurement Services S.A. (“SPS”), a third party company, to provide to its fleet certain procurement services. During the year ended December 2018, the Company entered into the following management agreements with: i) Augustea Technoservices Ltd and Songa Shipmanegement Ltd to provide technical management to certain of its vessels, following the completion of the Augustea Vessel Purchase Transaction and Songa Vessel Purchase Transaction (Note 3) and ii) Equinox Maritime Ltd, Zeaborn GmbH & Co. KG and Technomar Shipping Inc to provide certain management services to certain of its vessels. Total management fees under the aforementioned management agreements in effect for the years ended December 31, 2017, 2018 and 2019, were $7,543, $11,321 and $17,500, respectively, and are included in “Management fees” in the consolidated statements of operations.

Equity Incentive Plans

Equity Incentive Plans	12 Months Ended
	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Equity Incentive Plans	13. Equity Incentive Plans: On April 13, 2015, the Board of Directors granted share purchase options of up to 104,250 common shares to certain executive officers, at an option exercise price of $27.50 per share. These options are exercisable in whole or in part between the third and the fifth anniversary of the grant date, subject to the respective individuals remaining employed by the Company at the time the options are exercised. The options expire after the fifth anniversary if not exercised. The fair value of all share option awards was calculated based on the modified Black-Scholes method. A description of the significant assumptions used to estimate the fair value of the share option awards is set out below: • Option type: • Grant Date: • Expected term: • Expected volatility: • Expected dividends: • Dilution adjustment: • Risk-free rate: On February 22, 2017, the Company’s Board of Directors adopted the 2017 Equity Incentive Plan (the “2017 Plan”) and reserved for issuance 950,000 common shares thereunder. The terms and conditions of the 2017 Plan are substantially similar to the terms and conditions of the Company’s previous equity incentive plans. On the same date, 944,000 restricted common shares were granted to certain of our directors, officers and employees, of which 744,000 shares vested on August 22, 2017. The remaining 200,000 restricted common shares vested on August 22, 2018. The fair value of each share was determined based on the closing price of the Company’s common shares on the grant date, February 22, 2017. On February 27, 2018, the Company’s Board of Directors adopted the 2018 Equity Incentive Plan (the “2018 Plan”) and reserved for issuance 700,000 common shares thereunder. The terms and conditions of the 2018 Plan are substantially similar to the terms and conditions of the Company’s previous equity incentive plans. On the same date, 396,500 restricted common shares were granted to certain of the Company’s directors and officers of which 253,500 restricted common shares vested on August 27, 2018, 71,500 restricted common shares vested on February 27, 2019 and the remaining 71,500 restricted common shares vest on February 27, 2021. The fair value of each share was determined based on the closing price of the Company’s common shares on the grant date, February 27, 2018. In addition, on April 9, 2018, 276,000 restricted common shares were granted to the Company’s employees, all of which vested on August 27, 2018. The fair value of each share was determined based on the closing price of the Company’s common shares on the grant date, April 9, 2018. On January 7, 2019, the Company’s Board of Directors and Compensation Committee established an incentive program for key employees, pursuant to which an aggregate of 4,000,000 restricted share units (each, a “RSU”), comprising of 10 tranches of 400,000 RSU each, will be issued. The fair value of each issuable share was determined based on the closing price of the Company’s common shares on the grant date, January 7, 2019. Each RSU represents, upon vesting, a right for the beneficiary to receive one common share of the Company. The RSUs are subject to the satisfaction of certain performance conditions, which apply if the Company’s fleet performs better than the relevant dry bulk charter rate indices as reported by the Baltic Exchange (the “Indices”) during 2020 and 2021. The RSUs start to vest if the Company’s fleet performs better than the Indices by at least $120,000, and vest in increasing amounts if and to the extent the performance of the Company’s fleet exceeds the performance that would have been derived based on the Indices by up to an aggregate of $300,000. Subject to the vesting conditions being met on April 30, 2021 and April 30, 2022 (each, a “Vesting Date”) two million RSUs will vest on each Vesting Date, on tranches based on the level of performance, and the relevant common shares of the Company will be issued by the Company and distributed to the relevant beneficiaries as per the allocation of the Board of Directors. Any non-vested RSUs at the applicable Vesting Date will be cancelled. As of December 31, 2019, the Company takes the view that only for one tranche of the RSUs which vest on April 30, 2022, the likelihood of vesting meets the “more likely than not” standard under US GAAP and as a result amortization expense for these 400,000 RSUs of $1,235 was recognized and is included under “General and administrative expenses” in the consolidated statement of operations for the year ended December 31, 2019. On May 22, 2019, the Company’s Board of Directors adopted the 2019 Equity Incentive Plan (the “2019 Plan”) and reserved for issuance 900,000 common shares thereunder. The terms and conditions of the 2019 Plan are substantially similar to the terms and conditions of the Company’s previous equity incentive plans. On the same date, 885,000 restricted common shares were granted to certain of the Company’s directors, officers and employees of which 685,462 restricted common shares vested in August 2019, 99,769 restricted common shares will vest in August 2020 and the remaining 99,769 restricted common shares will vest in August 2022. The fair value of each share was determined based on the closing price of the Company’s common shares on the grant date, May 22, 2019. All non-vested shares and options vest according to the terms and conditions of the applicable award agreements. The grantee does not have the right to vote the non-vested shares or exercise any right as a shareholder of the non-vested shares, although the issued and non-vested shares pay dividends as declared. The dividends with respect to these shares are forfeitable if the service conditions are not fulfilled. Share options have no voting or other shareholder rights. For the years ended December 31, 2017 and 2018, the Company paid no dividends on non-vested shares. For the year ended December 31, 2019 the Company paid $14 for dividends to non-vested shares. The shares which are issued in accordance with the terms of the Company’s equity incentive plans or awards remain restricted until they vest. For the years ended December 31, 2017, 2018 and 2019, the share based compensation cost (including the RSUs) was $9,267, $8,072, and $7,943 respectively, and is included under “General and administrative expenses” in the consolidated statements of operations. There were no forfeitures of non-vested shares or options during the years 2017, 2018 and 2019. A summary of the status of the Company’s non-vested restricted shares as of December 31, 2017, 2018 and 2019, and the movement during these years, is presented below: Number of shares Weighted Average Grant Date Fair Value Unvested as at January 1, 2017 385,000 $ 4.82 Granted 944,000 9.59 Vested (1,049,000) 8.24 Unvested as at December 31, 2017 280,000 $ 8.09 Unvested as at January 1, 2018 280,000 $ 8.09 Granted 672,500 11.68 Vested (809,500) 10.29 Unvested as at December 31, 2018 143,000 $ 12.49 Unvested as at January 1, 2019 143,000 $ 12.49 Granted 885,000 8.13 Vested (756,962) 8.54 Unvested as at December 31, 2019 271,038 $ 9.28 A summary of the status of the Company’s non-vested share options as of each of the years ended December 31, 2017, 2018 and 2019 is presented below. There has been no movement during each year: Options Number of options Weighted average exercise price Weighted Average Grant Date Fair Value Outstanding at beginning of period 104,250 $ 27.5 $ 7.0605 Granted - - - Vested - - - Outstanding at end of period 104,250 $ 27.5 $ 7.0605 As of December 31, 2019, the estimated compensation cost relating to non-vested share options and restricted share awards not yet recognized was $42 and $4,347, respectively, and is expected to be recognized over the weighted average period of 2.12 years and 0.3 years, respectively. The total fair value of shares vested during the years ended December 31, 2017, 2018 and 2019 was $12,023, $10,745 and $7,703 respectively.

Earnings _ (Loss) per share

Earnings / (Loss) per share	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings / (Loss) per Share:	14. Earnings / (Loss) per share: All common shares issued (including the restricted shares issued under the Company’s equity incentive plan) have equal rAll common shares issued (including the restricted shares issued under the Company’s equity incentive plan) have equal rights to vote and participate in dividends. The restricted shares issued under the Company’s equity incentive plans are subject to forfeiture provisions set forth in the applicable award agreement. The calculation of basic earnings per share does not consider the non-vested shares as outstanding until the time-based vesting restriction has lapsed. For the purpose of calculating diluted earnings / (loss) per share, the weighted average number of diluted shares outstanding includes the incremental shares assumed issued, determined in accordance with the treasury stock method. For the years ended December 31, 2017 and 2019, during which the Company incurred losses, the effect of 280,000 and 271,038 non-vested shares, respectively, as well as the effect of 104,250 non-vested share options, would be anti-dilutive, and “Basic loss per share” equals “Diluted loss per share.” For the year ended December 31, 2018 the denominator of the diluted earnings per share calculation includes 264,884 shares, being the number of incremental shares assumed issued under the treasury stock method and does not include the effect of 104,250 non-vested share options outstanding as of that date, as their effect was anti-dilutive. The Company calculates basic and diluted loss per share as follows: Years ended December 31, 2017 2018 2019 Income / (Loss) : Net income / (loss) $ (9,771) $ 58,397 $ (16,201) Basic earnings / (loss) per share: Weighted average common shares outstanding, basic 63,034,394 77,061,227 93,735,549 Basic earnings / (loss) per share $ (0.16) $ 0.76 $ (0.17) Effect of dilutive securities: Dillutive effect of non vested shares - 264,884 - Weighted average common shares outstanding, diluted 63,034,394 77,326,111 93,735,549 Diluted earnings / (loss) per share $ (0.16) $ 0.76 $ (0.17)

Accrued liabilities

Accrued liabilities	12 Months Ended
	Dec. 31, 2019
Accrued Liabilities [Abstract]
Accrued Liabilities:	15. Accrued liabilities: The amounts shown in the consolidated balance sheets are analyzed as follows: December 31, 2018 December 31, 2019 Audit fees $ 295 $ 232 Legal fees 34 40 Other professional fees 1,502 1,540 Vessel Operating and voyage expenses 6,514 37,555 Loan interest and financing fees 8,277 7,394 Income tax 232 - Total Accrued Liabilities $ 16,854 $ 46,761

Income taxes

Income taxes	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income taxes:	16. Income taxes The Company is in the business of international shipping and is not subject to a material amount of income taxes. The Company is subjected to tonnage taxes in certain jurisdictions as described below and includes these taxes under “Vessel Operating Expenses” in the consolidated statements of operations. The Company does receive dividends from its operating subsidiaries and these are not subject to withholding taxes nor are these dividends taxed at the Company upon receipt. Thus, the Company does not record deferred tax liabilities for any unremitted earnings as there are no taxes associated with the remittances. The Company is subjected to tax audits in the jurisdictions it operates in. There have been no adjustments assessed to the Company in the past and the Company believes there are no uncertain tax positions to consider. a) Taxation on Marshall Islands Registered Companies and tonnage tax Under the laws of the countries of the shipowning companies’ incorporation and/or vessels’ registration, the shipowning companies are not subject to tax on international shipping income. However, they are subject to registration and tonnage taxes. In addition, each foreign flagged vessel managed in Greece by Greek or foreign ship management companies is subject to Greek tonnage tax, under the laws of the Hellenic Republic. The technical managers of the Company’s vessels, which are established in Greece under Greek Law 89/67, are responsible for the filing and payment of the respective tonnage tax on behalf the Company. Furthermore, under the New Tonnage Tax System (“TTS”) for Cypriot merchant shipping, qualifying ship managers who opted and are accepted to be taxed under the TTS are subject to an annual tax referred to as tonnage tax, which is calculated on the basis of the net tonnage of the qualifying ships they manage. The technical managers of the Company’s vessels, which are established and operate in Cyprus, are responsible for the filing and payment of the respective tonnage tax. These taxes for 2017, 2018 and 2019 were $2,565, $1,506 and $2,087 respectively, and have been included under “Vessel operating expenses” in the consolidated statements of operations. b) Taxation on US Source Income - Shipping Income Under the United States Internal Revenue Code of 1986, as amended (the “Code”), the U.S. source gross transportation income of a ship-owning or chartering corporation, such as the Company, is subject to a 4% U.S. federal income tax without allowance for deduction, unless that corporation qualifies for exemption from tax under Section 883 of the Code and the Treasury Regulations promulgated thereunder. U.S. source gross transportation income consists of 50% of the gross shipping income that is attributable to transportation that begins or ends, but that does not both begin and end, in the United States. Under IRS regulations, a Company’s shares will be considered to be regularly traded on an established securities market if (i) one or more classes of its shares representing 50% or more of its outstanding shares, by voting power of all classes of shares of the corporation entitled to vote and of the total value of the shares of the corporation, are listed on the market and (ii) (A) such class of share is traded on the market, other than in minimal quantities, on at least 60 days during the taxable year or one sixth of the days in a short taxable year; and (B) the aggregate number of shares of such class of share traded on such market during the taxable year must be at least 10% of the average number of shares of such class of share outstanding during such year or as appropriately adjusted in the case of a short taxable year. Notwithstanding the foregoing, the treasury regulations provide, in pertinent part, that a class of the Company’s shares will not be considered to be “regularly traded” on an established securities market for any taxable year in which 50% or more of the vote and value of the outstanding shares of such class are owned, actually or constructively under specified share attribution rules, on more than half the days during the taxable year by persons who each own 5% or more of the vote and value of such class of the Company’s outstanding shares, (“5% Override Rule”). For the taxable year 2017 the Company believes that it was not exempt from U.S. federal income tax of 4% on U.S. source shipping income, as it believes that it does not satisfy the Publicly Traded Test for these years because it is subject to the 5% Override Rule. As a result, for the year ended December 31, 2017, tax charge of approximately $202 was recognized under “Income taxes” in the consolidated statement of operations. For the taxable years 2018 and 2019 the Company believes that it was exempt from U.S. federal income tax of 4% on U.S. source shipping income, as it believes that it satisfies the Publicly Traded Test for these years because it is not subject to the 5% Override Rule. c) Taxation on Maltese and Swiss Registered Companies In addition to the tax consequences described above, the Company may be subject to tax in one or more other jurisdictions, including Malta and Switzerland, where the Company conducts activities through certain of its subsidiaries. The Company believes that its tax exposure for years ended December 31, 2017, 2018 and 2019 in the above jurisdictions is immaterial. The amount of income taxes recognized in the Company’s consolidated statements of operations with respect to these jurisdictions for the years ended December 31, 2017, 2018 and 2019 were $34, $61 and $109.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies:	17. Commitments and Contingencies: a) Legal proceedings Various claims, suits, and complaints, including those involving government regulations and product liability, arise in the ordinary course of the shipping business. In addition, losses may arise from disputes with charterers, agents, insurance and other claims with suppliers relating to the operations of the Company’s vessels. The Company’s vessels are covered for pollution of $1 billion per vessel per incident, by the Protection and Indemnity (P&I) Association in which the Company’s vessels are entered. The Company’s vessels are subject to calls payable to their P&I Association and may be subject to supplemental calls which are based on estimates of premium income and anticipated and paid claims. Such estimates are adjusted each year by the Board of Directors of the P&I Association until the closing of the relevant policy year, which generally occurs within three years from the end of the policy year. Supplemental calls, if any, are expensed when they are announced and according to the period they relate to. The Company is not aware of any supplemental calls in respect of any policy years other than those that have already been recorded in its consolidated financial statements. b) Other contingencies: Contingencies relating to Heron On July 11, 2014, Oceanbulk Shipping became a wholly owned subsidiary of the Company. Oceanbulk Shipping owned a convertible loan, which was convertible into 50% of Heron Ventures Ltd’s (“Heron”) equity. After the conversion of the loan, on November 5, 2014, Heron was a 50-50 joint venture between Oceanbulk Shipping and ABY Group Holding Limited, and Oceanbulk Shipping shared joint control over Heron with ABY Group Holding Limited. Based on the applicable related agreements, neither party will entirely control Heron. In addition, any operational and other decisions with respect to Heron will need to be jointly agreed between Oceanbulk Shipping and ABY Group Holding Limited. As of December 31, 2017, all vessels previously owned by Heron have been either sold or distributed to its equity holders. While Oceanbulk Shipping and ABY Group Holding Limited intend that Heron eventually will be dissolved shortly after receiving permission from local authorities in Malta, until that occurs, contingencies to the Company may arise. However, the pre-transaction investors in Heron effectively remain as ultimate beneficial owners of Heron, until Heron is dissolved on the basis that, according to the agreement governing the Merger, any cash received or paid by the Company from the final liquidation of Heron will be settled accordingly by the pre-Merger investors in Oceanbulk (the “Oceanbulk Sellers”). The Company had no outstanding balance with the Oceanbulk Sellers as of December 31, 2017. In July 2018, ABY Group Holding Limited transferred to ABY Floriana Limited its interests to Heron. c) Commitments: The following table sets forth inflows and outflows, related to the Company’s charter party arrangements and other commitments, as of December 31, 2019. Twelve month periods ending December 31, + inflows/ - outflows Total 2020 2021 2022 2023 2024 2025 and thereafter Future, minimum, non-cancellable charter revenue (1) $ 15,349 $ 15,349 $ - $ - $ - $ - $ - Future, minimum, charter-in hire payments (2) (3,894) (3,894) - - - - - Vessel scrubbers (3) (48,634) (48,634) - - - - - Office rent (1,223) (327) (329) (314) (210) (43) - Total $ (38,402) $ (37,506) $ (329) $ (314) $ (210) $ (43) $ - (1) The amounts represent the minimum contractual charter revenues to be generated from the existing, as of December 31, 2019, non-cancellable time charter agreements, until their expiration, net of address commission, assuming no off-hire days, other than those related to scheduled interim and special surveys of the vessels. (2) The amounts represent the Company’s commitments under the existing, as of December 31, 2019, time charter-in arrangements for third party vessels. (3) The amounts represent the Company’s commitments for its vessels scrubber retrofitting program that the Company entered into in 2018 and 2019. For the respective payments, the Company has obtained financing of $149,765 of which $46,227 remains undrawn as of December 31, 2019 (Note 9).

Voyage revenues

Voyage revenues	12 Months Ended
	Dec. 31, 2019
Voyage Revenues
Voyage revenues:	18. Voyage revenues: The following table shows the voyage revenues earned from time charters, voyage charters and pool agreements for the years ended December 31, 2017, 2018 and 2019, as presented in the consolidated statements of operation: Years ended December 31, 2017 2018 2019 Time charters $ 240,529 $ 397,499 $ 373,927 Voyage charters 102,977 253,812 437,779 Pool revenues 574 250 9,659 $ 344,080 $ 651,561 $ 821,365 The voyage revenues for the year ended December 31, 2017 presented in the consolidated statement of operations have been reduced by address commission of $12,104 which is not reflected in the above analysis. As of December 31, 2019, trade accounts receivable, net increased by $20,383, and deferred revenue decreased by $3,481 compared to December 31, 2018. These changes were mainly attributable to the timing of collections. Further, as of December 31, 2019, deferred assets related to revenue contracts (included within “Other current assets”) increased by $805 compared to December 31, 2018, from $2,054 to $2,859. This change was mainly attributable to the increase in the number of the voyage contracts in progress as of December 31, 2019 and the timing of commencement of revenue recognition. The Company recorded $10,855 as unearned revenue related to voyages in progress as of December 31, 2018, which were recognized in earnings during the year ended December 31, 2019 as the performance obligations were satisfied in that period.

Voyage and Vessel operating exp

Voyage and Vessel operating expenses	12 Months Ended
	Dec. 31, 2019
Costs and Expenses [Abstract]
Voyage and Vessel operating expenses	19. Voyage and Vessel operating expenses: The amounts in the consolidated statements of operations are analyzed as follows: Years ended December 31, 2017 2018 2019 Voyage expenses Port charges $ 21,060 $ 37,215 $ 63,576 Bunkers 34,997 72,287 146,089 Commissions – third parties 3,438 6,179 6,828 Commissions – related parties (Note 3) 3,300 3,400 3,850 Miscellaneous 1,887 2,515 2,619 Total voyage expenses $ 64,682 $ 121,596 $ 222,962 Vessel operating expenses Crew wages and related costs $ 63,074 $ 80,360 $ 103,701 Insurances 6,314 7,544 10,311 Maintenance, repairs, spares and stores 18,589 26,368 25,675 Lubricants 7,016 8,494 9,833 Tonnage taxes 2,565 1,506 2,087 Pre-delivery and Pre-joining expenses 1,925 1,234 1,507 Miscellaneous 1,945 3,366 6,948 Total vessel operating expenses $ 101,428 $ 128,872 $ 160,062

Fair value measurements and Hed

Fair value measurements and Hedging	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements:	20. Fair Value Measurements and Hedging: The guidance for fair value measurements applies to all assets and liabilities that are being measured and reported on a fair value basis. This guidance enables the reader of the financial statements to assess the inputs used to develop those measurements by establishing a hierarchy for ranking the quality and reliability of the information used to determine fair values. The same guidance requires that assets and liabilities carried at fair value should be classified and disclosed in one of the following three categories based on the inputs used to determine its fair value: Level 1: Quoted market prices in active markets for identical assets or liabilities; Level 2: Observable market based inputs or unobservable inputs that are corroborated by market data; Level 3: Unobservable inputs that are not corroborated by market data. In addition, ASC 815, “Derivatives and Hedging” requires companies to recognize all derivative instruments as either assets or liabilities at fair value in the balance sheet. Fair value on a recurring basis: Interest rate swaps: The Company from time to time enters into interest rate derivative contracts to manage interest costs and risk associated with changing interest rates with respect to its variable interest loans and credit facilities. Interest rate swaps – (continued): As of December 2018 and 2019, the Company had no interest rate swaps open positions. Forward Freight Agreements (“FFAs”) and Bunker Swaps: During the years ended December 31, 2017, 2018 and 2019, the Company entered into a certain number of FFAs on the Capesize, Panamax and Supramax indices. The results of the Company’s FFAs during the years ended December 31, 2017, 2018 and 2019 and the valuation of the Company’s open position as at December 31, 2018 and 2019 are presented in the tables below. During the years ended December 31, 2017, 2018 and 2019, the Company entered into a certain number of bunker swaps. In December 2019, the Company also entered into a bunker swap with ING Bank N.V. to hedge 84,000 metric tons or approximately 10% of its estimated annual fuel consumption by selling the 2020 Singapore spread between Very Low-Sulfur Fuel Oil (VLSFO) – High-Sulfur Fuel Oil (HSFO) at $266 per ton. The effective date of the swap is January 1, 2020 and the maturity date is December 31, 2020. The results of the Company’s bunker swaps and the valuation of the Company’s open position as at December 31, 2018 and 2019 are presented in the tables below. The amount of Gain/ (Loss) on derivative financial instruments, forward freight agreements and bunker swaps recognized in the consolidated statements of operations are analyzed as follows: Years ended December 31, 2017 2018 2019 Consolidated Statement of Operations Gain/(loss) on derivative financial instruments, net Unrealized gain/(loss) after de-designation of accounting hedging relationship (April 1, 2015) $ 2,802 $ 140 $ - Realized gain/(loss) after de-designation of accounting hedging relationship (April 1, 2015) (2,556) (141) - Write-off of unrealized losses related to forecasted transactions which are no longer considered probable reclassified from other comprehensive income/(loss) - 708 - Ineffective portion of cash flow hedges - - - Total Gain/(loss) on derivative financial instruments, net $ 246 $ 707 $ - Interest and finance costs Reclassification adjustments of interest rate swap loss/(gain) transferred to Interest and finance costs from Other comprehensive income/(loss) (Note 9) (852) 3 - Total Gain/(loss) recognized $ (852) $ 3 $ - Gain/(loss) on forward freight agreements and bunker swaps Realized gain/(loss) on forward freight agreements (877) (599) 6,043 Realized gain/(loss) on bunker swaps - 1,491 (1,386) Unrealized gain/(loss) on forward freight agreements (24) 520 (321) Unrealized gain/(loss) on bunker swaps 60 (1,859) 75 Total Gain/(loss) recognized $ (841) $ (447) $ 4,411 The following table summarizes the valuation of the Company’s financial instruments as of December 31, 2018 and 2019, based on Level 1 quoted market prices in active markets. Quoted Prices in Active Markets for Identical Assets (Level 1) December 31, 2018 December 31, 2019 (not designated as cash flow hedges) (designated as cash flow hedges) (not designated as cash flow hedges) (designated as cash flow hedges) ASSETS Forward freight agreements - asset position $ 537 - $ 216 - Total $ 537 - $ 216 - LIABILITIES Bunker swaps - liability position 1,799 - $ 1,724 - Total $ 1,799 - $ 1,724 - The carrying values of temporary cash investments, restricted cash, accounts receivable and accounts payable approximate their fair value due to the short-term nature of these financial instruments. The fair value of long-term bank loans and bareboat leases (Level 2), bearing interest at variable interest rates, approximates their recorded values as of December 31, 2019, due to the variable interest rate nature thereof. The 2022 Notes have a fixed rate, and their estimated fair value as of December 31, 2018 and 2019, determined through Level 1 inputs of the fair value hierarchy (quoted price on NASDAQ under the ticker symbol SBLKZ), was approximately $49,800 and $51,360, respectively. Fair value hedge designation In order to mitigate its exposure to the foreign currency risk arising from its commitments in connection with its vessels’ scrubber retrofitting program, denominated in Euro, in early April 2018 the Company converted some of its cash held in US dollars to Euro in an amount sufficient to cover 100% of its fixed orders and approximately 50% of its then optional orders with respect to the scrubber retrofitting program. During the fourth quarter of 2018 an additional amount of cash in USD was converted to Euro with the total amount of Euro converted being approximately €70.8 million, of which approximately €20.5 million was related to the fixed orders at the time of designation. This amount is being held until the payments under the contracts for scrubbers (or “unrecognized firm commitment”) are made. The Euro conversions corresponding to the fixed orders at that time were designated, on April 3, 2018, as a fair value hedge with the portion of the unrecognized firm commitment corresponding to the fixed orders being the “hedged item” and the Euro deposits corresponding to the fixed orders being the “Hedging Instrument”. Because the critical terms (currency, timing, and notional amounts) of the hedged item and the hedging instrument match in all material respects, the hedge is considered to highly offset changes in the fair value of the unrecognized firm commitment attributable to changes in the USD/Euro exchange rates. The foreign exchange loss recognized from the re-measurement of the total Euro conversions discussed above during the year ended December 31, 2018 was $3,159 and is included in “Interest and other income/(loss)” in the consolidated statement of operations. The cumulative amount of fair value hedging adjustment that was attributable to the aforementioned hedge during the year ended December 31, 2018 was $1,609 and is reflected within “Vessels and other fixed assets, net”, in the consolidated balance sheet, following the recognition of the corresponding firm commitment during the year. The corresponding gain of $1,609 recognized from April 3, 2018 to December 31, 2018 is recorded within “Interest and other income/(loss)” in the consolidated statement of operations. The ineffective portion of the aforementioned hedge as of December 31, 2018 was $39 and is reflected within “Interest and other income/(loss)” in the consolidated statement of operations. As of December 31, 2018, the entire amount of €20.5 million Euro conversions associated with this hedging relationship had been used and no such hedging relationship was designated in 2019. Fair value on a nonrecurring basis The Company reviewed, in 2017, 2018 and 2019 the recoverability of the carrying amount of its vessels. The Company’s impairment analysis as of December 31, 2017, indicated that the carrying amount of the Company’s vessels, was recoverable, and therefore, the Company concluded that no impairment charge was necessary. As further disclosed in Note 5, during 2018 and 2019, the Company recognized impairment losses of $17,784 and $3,411, respectively, related to the agreed and intended sale of certain operating vessels. The carrying value of the respective vessels was written down to the fair value as determined by reference to their agreed or negotiated sale prices (Level 2). The following table summarizes the valuation of these assets measured at fair value on a non-recurring basis as of December 31, 2018: Long-lived assets held and used Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Impairment loss (Level 1) (Level 2) (Level 3) Held for sale $ - $ 5,949 $ - $ 1,606 Vessels, net $ - $ 14,893 $ - $ 16,178 TOTAL $ - $ 20,842 $ - $ 17,784 The table following table summarizes the valuation of these assets measured at fair value on a non-recurring basis as of December 31, 2019: Long-lived assets held and used Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Impairment loss (Level 1) (Level 2) (Level 3) Vessels, net $ - $ 24,475 $ - $ 3,411 TOTAL $ - $ 24,475 $ - $ 3,411

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events:	21. Subsequent Events: a) On February 19, 2020, the Company declared a quarterly cash dividend of $0.05 per share which was paid on March 12, 2020, to all shareholders of record as of March 2, 2020 (“Record Date”). The ex-dividend date was February 28, 2020. b) In January 2020, the Company entered into a committed term sheet with Danish Ship Finance A/S for a loan of up to $55.0 million (the “DSF $55.0 million Facility”). The facility will be available in two tranches of up to $27.5 million each, and will be used to refinance the outstanding amounts under the lease agreements of Star Eleni Star Leo (Note 7) c) In February 2020, the Company executed the definitive loan documentation with HSBC France for an amount of up to $30.0 million in order to finance working capital requirements (the “HSBC Working Capital Facility”) (Note 9). In February 2020, an amount of $8,834 was drawn under the HSBC Working Capital Facility. In addition, on March 23, 2020 an amount of $13,123 was drawn under the HSBC Working Capital Facility and an additional amount of $2,225 is expected to be drawn on or about March 30, 2020. d) In 2020 the Company entered into bunker swaps with ING Bank N.V. and Intercontinental Exchange, Inc (“ICE”) to hedge in aggregate 70,000 metric tons of its estimated fuel consumption by selling the Singapore spread between VLSFO – HSFO at an average price of $146 per ton for the period from March to December 2020 (7,000 metric tons per month). The effective date of these swaps is March 1, 2020 and the maturity date is December 31, 2020. In addition, in 2020 the Company entered into a bunker swap with ING Bank N.V. to hedge in aggregate 24,000 metric tons of its estimated fuel consumption by selling the Singapore spread between VLSFO – HSFO at an average price of $106 per ton for the period from January to December 2021 (2,000 metric tons per month). The effective date of these swaps is January 1, 2021 and the maturity date is December 31, 2021. e) In March 2020, the Company entered into various interest rate derivative contracts with ING Bank N.V (“ING”), DNB Bank ASA (“DNB”) and Skandinaviska Enskilda Banken AB (“SEB”) to fix forward some of its floating interest rate liabilities the major terms of which are provided below: Counterparty Inception Expiry Fixed Rate Amortizing Notional amount Average Annual amortization ING 29-Mar-20 29-Mar-26 0.70% from $29.96 mil to $17.65 mil $1.2 million DNB 30-Mar-20 28-Sep-23 0.64% from $128.91 mil to $51.02 mil $6.0 million SEB 30-Mar-20 28-Sep-23 0.63% from $51.57 mil to $20.41 mil $2.4 million ING 2-Apr-20 2-Oct-25 0.70% from $19.69 mil to $9.84 mil $1.9 million ING 2-Apr-20 2-Oct-25 0.70% from $19.69 mil to $9.84 mil $1.9 million ING 3-Apr-20 3-Apr-23 0.68% from $16.16 mil to $12.74 mil $0.3 million SEB 30-Apr-20 30-Jan-25 0.73% from $29.44 mil to $19.25 mil $2.7 million SEB 30-Apr-20 30-Jan-25 0.73% from $29.44 mil to $19.25 mil $2.7 million f) On March 11, 2020, the World Health Organization declared the 2019 Novel Coronavirus (the “Covid-19”) outbreak a pandemic. In response to the outbreak, many countries, ports and organizations, including those where the Company conducts a large part of its operations, have implemented measures to combat the outbreak, such as quarantines and travel restrictions. Such measures have and will likely continue to cause severe trade disruptions. The extent to which Covid-19 will impact the Company’s results of operations and financial condition will depend on future developments, which are highly uncertain and cannot be predicted, including new information which may emerge concerning the severity of the virus and the actions to contain or treat its impact, among others. Accordingly, an estimate of the impact cannot be made at this time.

Significant Accounting polici_2

Significant Accounting policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Principles of consolidation	a) Principles of consolidation: Star Bulk as the holding company determines whether it has controlling financial interest in an entity by first evaluating whether the entity is a voting interest entity or a variable interest entity. Under ASC 810 “Consolidation”, a voting interest entity is an entity in which the total equity investment at risk is sufficient to enable the entity to finance itself independently and provides the equity holders with the obligation to absorb losses, the right to receive residual returns and make financial and operating decisions. Star Bulk consolidates voting interest entities in which it owns all, or at least a majority (generally, greater than 50%), of the voting interest. Following the provisions of ASC 810 “Consolidation”, the Company evaluates all arrangements that may include a variable interest in an entity to determine if it may be the primary beneficiary, and would be required to include assets, liabilities and operations of a variable interest entity (“VIE”) in its consolidated financial statements. The Company’s evaluation did not result in an identification of variable interest entities for the years 2017, 2018 and 2019.
Equity method investments	b) Equity method investments:
Use of estimates	c) Use of estimates:
Comprehensive income/(loss)	d) Comprehensive income/(loss):
Concentration of credit risk	e) Concentration of credit risk:
Foreign currency transactions	f) Foreign currency transactions:
Cash and cash equivalents	g) Cash and cash equivalents:
Restricted cash	h) Restricted cash
Trade accounts receivable, net	i) Trade accounts receivable, net:
Inventories	j) Inventories:
Vessels, net	k) Vessels, net: The cost of each of the Company’s vessels is depreciated beginning when the vessel is ready for its intended use, on a straight-line basis over the vessel’s remaining economic useful life, after considering the estimated residual value (vessel’s residual value is equal to the product of its lightweight tonnage and estimated scrap rate per ton). Management estimates the useful life of the Company’s vessels to be 25 years from the date of initial delivery from the shipyard. When regulations place limitations over the ability of a vessel to trade on a worldwide basis, its remaining useful life is adjusted at the date such regulations are adopted. The estimated salvage value of each vessel is $0.3 per light weight ton as of December 31, 2019 and 2018, which is based on the historical average demolition prices.
Advances for vessels under construction and acquisition of vessels	l) Advances for vessels under construction and acquisition of vessels:
Fair value of above/below market acquired time charters	m) Fair value of above/below market acquired time charters:
Impairment of long-lived assets	n) Impairment of long-lived assets: In this respect, management regularly reviews the carrying amount of the vessels, including newbuilding contracts, if any, on a vessel-by-vessel basis, when events and circumstances indicate that the carrying amount of the vessels or newbuilding contracts might not be recoverable (such as vessel sales and purchases, business plans, obsolescence or damage to the asset and overall market conditions). When impairment indicators are present, the Company compares future undiscounted net operating cash flows to the carrying values of the Company’s vessels to determine if the asset is required to be impaired. In developing its estimates of future undiscounted net operating cash flows, the Company makes assumptions and estimates about vessels’ future performance, with the significant assumptions being related to charter rates, ship operating expenses, vessels’ residual value, fleet utilization and the estimated remaining useful lives of the vessels. These assumptions are based on current market conditions, historical industry and Company’s specific trends, as well as future expectations. The future undiscounted net operating cash flows are determined by considering the charter revenues from existing time charters for the fixed vessel days and an estimated daily time charter equivalent rate for the unfixed days over the estimated remaining economic life of each vessel, net of brokerage and address commissions. Estimates of the daily time charter equivalent rate for the unfixed days are based on the current Forward Freight Agreement (“FFA”) rates, for the first three-year period, average of FFA rates and historical average rate levels for the fourth year and historical average rate levels of similar size vessels for the period thereafter. The expected cash inflows from charter revenues are based on an assumed fleet utilization rate for the unfixed days over available days, taking also into account expected technical off-hire days. In addition, in light of the Company’s investment in exhaust gas cleaning systems (“EGCS” or “Scrubbers”), an estimate of an additional daily revenue for each scrubber fitted vessel was also included, reflecting additional compensation from charterers due to the fuel cost savings that these vessels provide. In assessing expected future cash outflows, management forecasts vessel operating expenses, which are based on the Company’s internal budget for the first annual period and thereafter assume an annual inflation rate and are capped at the thirteenth year thereafter, vessel expected maintenance costs (for dry docking and special surveys) and management fees. The estimated salvage value of each vessel is $0.3 per light weight ton, in accordance with the Company’s vessel depreciation policy. The Company uses a probability weighted approach for developing estimates of future cash flows used to test its vessels for recoverability when alternative courses of action are under consideration (i.e. sale or continuing operation of a vessel). If the Company’s estimate of future undiscounted net operating cash flows for any vessel is lower than the vessel’s carrying value, the carrying value is written down to the vessel’s fair market value with a charge recorded under “Impairment loss” in the consolidated statement of operations.
Vessels held for sale	o) Vessels held for sale: Vessels classified as held for sale are measured at the lower of their carrying amount or fair value less cost to sell. The resulting difference, if any, is recorded under “Impairment loss” in the consolidated statement of operations. The vessels are not depreciated once they meet the criteria to be classified as held for sale.
Financing costs	p) Financing costs: .
Debt Modifications and extinguishments	q) Debt Modifications and extinguishments:
Share based compensation	r) Share based compensation: Awards of restricted shares, restricted share units or share options that are subject to performance conditions are also measured at their fair value, which is equal to the market value of the Company’s common shares on the grant date. If the award is subject only to performance conditions, compensation cost is recognized only if the performance conditions are satisfied (essentially, the requisite service is not considered to have been provided if the performance condition is not achieved). For awards that are subject to performance conditions and future service conditions, if it is probable that the performance condition for these awards will be satisfied, the compensation cost in respect of these awards is recognized over the requisite service period. If it is initially determined that it is not probable that the performance condition will be satisfied and it is later determined that the performance conditions are likely to be satisfied (or vice versa), the effect of the change in estimate is retroactively accounted for in the period of change by recording a cumulative catch-up adjustment to retroactively apply the new estimate. If the award is forfeited because the performance condition is not satisfied, any previously recognized compensation cost is reversed. The fair value of share options grants is determined with reference to option pricing models, and depends on the terms of the granted options. The fair value is recognized (as compensation expense) over the requisite service period for all awards that vest.
Dry docking and special survey expenses	s) Dry docking and special survey expenses:
Accounting for revenue and related expenses	t) Accounting for revenue and related expenses: Under time charter agreements, voyage costs, such as fuel and port charges are borne and paid by the charterer. The Company’s time charter agreements are classified as operating leases pursuant to ASC 842 “Leases”, as further disclosed in Note 2(x). As further analyzed in Note 2(x), the Company has determined that its voyage charter agreements do not contain a lease and are therefore considered service contracts that fall under the provisions of ASC 606. The majority of revenue from voyage charter agreements is usually collected in advance. The Company has determined that there is one single performance obligation for each of its voyage contracts, which is to provide the charterer with an integrated transportation service within a specified time period. In addition, the Company has concluded that a contract for a voyage charter meets the criteria to recognize revenue over time because the charterer simultaneously receives and consumes the benefits of the Company’s performance as the Company performs. Therefore, since the Company’s performance obligation under each voyage contract is met evenly as the voyage progresses, revenue is recognized on a straight line basis over the voyage days from the loading of cargo to its discharge. Demurrage income, which is considered a form of variable consideration, is included in voyage revenues, and represents payments by the charterer to the vessel owner when loading or discharging time exceeds the stipulated time in the voyage charter agreements. Demurrage income for the years ended December 31, 2017, 2018 and 2019 was not material. Under voyage charter agreements, all voyage costs are borne and paid by the Company. Voyage expenses consist primarily of brokerage commissions, bunker consumption, port and canal expenses and agency fees related to the voyage. Pursuant to the provisions of ASC 340-40, “Other Assets and Deferred Costs – Contracts with Customers” for contract costs, all voyage costs are considered contract fulfilment costs because they are directly related to the performance of the voyage contract. Those costs are expensed as incurred, with the exception of those contract fulfilment costs incurred prior to the commencement of loading the cargo on the relevant vessel, which are capitalized to the extent the Company, in its reasonable judgement, determines that they (i) are directly related to a contract, (ii) will be recoverable and (iii) enhance the Company’s resources by putting the Company’s vessel in a location to satisfy its performance obligation under a contract. These capitalized contract fulfilment costs are recorded under “Other current assets” and are amortized on a straight-line basis as the related performance obligations are satisfied. The Company adopted ASC 606 on January 1, 2018 using the modified retrospective approach, and has been applied to all voyage contracts not completed as of the date of the initial application. As such, the information prior to January 1, 2018 has not been restated and continues to be reported under the accounting standards in effect for periods prior to January 1, 2018.
Fair value measurements	u) Fair value measurements:
Earnings/ (loss) per share	v) Earnings/ (loss) per share:
Segment reporting	w) Segment reporting :
Leases	x) Leases: The Company elected to use the optional new transition method for the adoption of ASC 842 that results in initial recognition of a cumulative effect adjustment to retained earnings in the year of adoption. As a result, prior periods as reported by the Company, have not been impacted by the adoption. The Company also elected to use the practical expedient for lessors to combine the lease and non-lease components of revenues for recognition, measurement and presentation purposes, as also described below. In addition, in connection with its adoption of ASC 842, the Company elected to use the “package of 3” practical expedients permitted under the transition guidance, which exempts the Company from reassessing: • whether any expired or existing contracts are or contain leases; • any expired or existing lease classifications; and • initial direct costs for any existing leases. Lastly, the Company elected not to use the practical expedient of hindsight in determining the lease term and in assessing the impairment of the Company’s operating lease right-of-use assets. The Company’s adoption of ASC 842 did not have a material effect on the consolidated financial statements for the reasons discussed below: Company acting as Lessor: As also described in Note 2(t), the Company generates its revenues from charterers for the charter hire of its vessels under time charter agreements, in which a contract is entered into for the use of a vessel for a specific period of time and a specified daily charter hire rate, or voyage charter agreements, where a contract is made in the spot market for the use of a vessel for a specific voyage at a specified freight rate per ton. The Company considered the provisions of ASC 842 and determined that its voyage charter agreements do not contain a lease because the charterer under such contracts does not have the right to control the use of the vessel since the Company, as the ship-owner, retains control over the operations of the vessel, provided also that the terms of the voyage charter are pre-determined, and any change requires the Company’s consent. On the other hand, the Company determined that its time charter agreements are leases that are governed by ASC 842 because, pursuant to the time charter agreements, (a) the vessel is an identifiable asset, (b) the Company does not have substitution rights and (c) the charterer has the right to control the use of the vessel during the term of the contract and derives economic benefits from such use. In addition, since none of the criteria for classification as sales-type leases or direct financing leases are met, the Company’s time charter agreements are classified as operating leases. The duration of the contracts that the Company is entering into depends on the market conditions, with the duration decreasing during weak market conditions. During 2019 in their majority the Company’s time charter contracts did not exceed the period of 12 months, including optional extension periods. Future minimum rental payments for the existing contracts as of December 31, 2019, are presented in Note 17 below. Upon adoption of ASC 842, the timing and recognition of earnings from time charter contracts to which the Company is party did not change from previous practice, with the exception of ballast bonuses which were recognized during the ballast leg but are now deferred and recognized over time during the charter period, as well as the deferral of certain direct costs incurred during the ballast leg that meet the required criteria for capitalization and amortize during the charter period. Included in the charter hire rate is also compensation for running the vessel, such as crewing expenses, repairs and maintenance and insurance. The Company, making use of the practical expedient for lessors, has elected not to separate the lease and non-lease components included in the time charter revenue but rather to recognize lease revenue as a combined single lease component for all time charter contracts (operating leases) as the related lease component and non-lease component have the same timing and pattern of transfer ( i.e. Company acting as Lessee: A) As already discussed in Note 1, during 2018 and 2019 the Company chartered-in a number of third-party vessels to increase its operating capacity in order to satisfy its clients’ needs. All charter-in operating leases that the Company had entered into and were effective as of December 31, 2018 and during the year ended December 31, 2019 are short to medium-term leases ( i.e B) The adoption of ASC 842 did not change the accounting for the leases already recognized on the balance sheet as capital leases under the previous leasing guidance given the transition provisions of ASC 842 and the practical expedients elected by the Company as discussed above. As such, those leases existing as of January 1, 2019, including all bareboat charter agreements that the Company had entered into that were in place as of that date, are classified as finance leases under the new leasing guidance of ASC 842, with the Company having reclassified the existing capital lease assets as of December 31, 2018 of $1,047,780 as right-of-use assets being reflected within Fixed Assets and the existing lease obligations as of December 31, 2018 of $609,737 as lease liabilities being reflected within Lease financing. The weighted-average discount rate for the Company’s bareboat charter agreements for the year ended December 31, 2019 was 5.66%. Please refer to Note 7 for the description of the nature of these leases, general terms, covenants included , any variable payments, if any, as well as the purchase obligations they provide for. C) Each sale and lease back transaction that the Company had entered into as of December 31, 2018 and during the year ended December 31, 2019, involved a purchase obligation and was therefore treated as a failed sale or merely a financing arrangement both before and after adoption of ASC 842, and therefore was not within the scope of sale and leaseback accounting. D) The Company has determined its office rental arrangements are operating leases. The office spaces that the Company leases are mostly located in Athens, Cyprus and Switzerland. Payments under these arrangements are fixed with no variable payments. The assets and liabilities recognized in respect of these agreements that correspond to the underlying rights and obligations were $1,198 as of January 1, 2019 and $1,216 as of December 31, 2019 and are presented within “Leased buildings, right-of-use assets” and “Leased buildings, operating lease liabilities” in the consolidated balance sheet. The discount rate used is 4%, being the estimated annual incremental borrowing rate for these type of assets. The lease expenses attributable to these leases are recognized on a straight line basis over the lease term and are recorded as part of General and Administrative expenses. These lease expenses were $403 and $352 for the years ended December 31, 2018 and 2019, respectively. The weighted average remaining lease term of the Company’s office rent arrangements is 3.9 years. Please also refer to Note 3 for office rent agreements entered into with related parties. Future minimum rental payments for existing contracts as of December 31, 2019, are presented in Note 17 below.
Derivatives & Hedging	y) Derivatives & Hedging: i) Derivative Financial Instruments: The Company enters into derivative and non-derivative financial instruments to manage risks related to fluctuations of interest rates and foreign currency exchange rates. All derivatives are recorded on the Company’s balance sheet as assets or liabilities and are measured at fair value. The valuation of interest rate swaps is based on Level 2 observable inputs of the fair value hierarchy, such as interest rate curves. The changes in the fair value of derivatives not qualifying for hedge accounting are recognized in earnings. Cash inflows/outflows attributed to derivative instruments are reported within cash flows from operating activities in the consolidated statements of cash flows. For the purpose of hedge accounting, hedges are classified as: · fair value hedges, when hedging the exposure to changes in the fair value of a recognized asset or liability or an unrecognized firm commitment, which in each case is attributable to a particular risk, including foreign currency risk; · cash flow hedges, when hedging exposure to variability in cash flows that is either attributable to a particular risk associated with a recognized asset or liability or a highly probable forecast transaction that could affect earnings; or · hedges of a net investment in a foreign operation. This type of hedge is not used by the Company. In case the instruments are eligible for hedge accounting, at the inception of a hedge relationship, the Company formally designates and documents the hedge relationship to which the Company wishes to apply hedge accounting and the risk management objective and strategy undertaken for the hedge. The documentation includes identification of the hedging instrument, the hedged item or transaction, the nature of the risk being hedged and how the Company will assess the hedging instrument’s effectiveness in offsetting exposure to changes in the hedged item’s cash flows or fair value attributable to the hedged risk. Such hedges are expected to be highly effective in achieving offsetting changes in cash flows or fair value and are assessed at each reporting date to determine whether they actually have been highly effective throughout the financial reporting periods for which they were designated. Fair value hedges A fair value hedge is a hedge of the exposure to changes in the fair value of a recognized asset or liability, or of an unrecognized firm commitment, which in each case is attributable to a particular risk. The change in the fair value of a hedging instrument is recognized in the consolidated statement of operations. The change in the fair value of the hedged item attributable to the risk hedged is recorded as part of the carrying value of the hedged item and is also recognized in the consolidated statement of operations. For fair value hedges, in which a non-derivative is used as hedging instrument for foreign currency risk of unrecognized firm commitments, the hedging instrument is re- measured based on the movement in functional currency cash flows attributable to the change in spot exchange rates between the functional currency and the currency in which the non-derivative hedging instrument is denominated. An asset or liability is recorded for the unrecognized firm commitment, which equals the foreign exchange gain or loss that is recorded in earnings as a result of the hedge relationship. The resulting asset or liability will eventually be treated as part of the consideration when the firm commitment is recognized. Cash Flow hedges A cash flow hedge is a hedge of the exposure to variability in cash flows that is attributable to a particular risk associated with a recognized asset or liability or a highly probable forecasted transaction that could affect earnings. For derivatives designated as cash flow hedges, the effective portion of the changes in their fair value is recorded in “Accumulated other comprehensive income / (loss)” and is subsequently recognized in earnings when the hedged items impact earnings, while the ineffective portion, if any, is recognized immediately in current period earnings under “Gain / (Loss) on derivative financial instruments, net.” Discontinuation of hedge relationships The Company discontinues prospectively fair value or cash flow hedge accounting if the hedging instrument expires or is sold, terminated or exercised and it no longer meets all the criteria for hedge accounting or if the Company de-designates the instrument as a cash flow or fair value hedge. As part of a cash flow hedge, at the time the hedging relationship is discontinued, any cumulative gain or loss on the hedging instrument recognized in equity remains in equity until the forecasted transaction occurs or until it becomes probable of not occurring. When the forecasted transaction occurs, any cumulative gain or loss on the hedging instrument is recognized in earnings. If a hedged transaction is no longer expected to occur, the net cumulative gain or loss recognized in equity is reclassified and recognized in earnings for the year. Similarly, as part of a fair value hedge, if the hedged item is derecognized, the unamortized fair value is recognized immediately in earnings. ii) Forward Freight Agreements and Bunker Swaps: In addition, from time to time, the Company may take positions in derivative instruments including forward freight agreements, or FFAs. Generally, FFAs and other derivative instruments may be used to hedge a vessel owner’s exposure to the charter market for a specified route and period of time. Upon settlement, if the contracted charter rate is less than the average of the rates for the specified route and time period, as reported by an identified index, the seller of the FFA is required to pay the buyer the settlement sum, being an amount equal to the difference between the contracted rate and the settlement rate, multiplied by the number of days in the specified period covered by the FFA. Conversely, if the contracted rate is greater than the settlement rate, the buyer is required to pay the seller the settlement sum. All of the FFAs are settled on a daily basis through reputable exchanges such as LCH, Singapore Exchange (SGX) or Nasdaq. FFAs are intended to serve as an economic hedge for the Company’s vessels that are being chartered in the spot market, effectively locking-in an approximate amount of revenue that the Company expects to receive from such vessels for the relevant periods. The Company measures the fair value of all open positions at each reporting date on this basis (Level 2). The Company’s FFAs do not qualify for hedge accounting and therefore gains or losses are recognized in the consolidated statements of operations under “(Gain)/Loss on forward freight agreements and bunker swaps.” Also, from time to time, 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. Bunker swaps are agreements between two parties to exchange cash flows at a fixed price on bunkers, where volume, time period and price are agreed in advance. The Company’s bunker swaps are settled through reputable clearing houses, including LCH. The fair value of bunker swaps is the estimated amount that the Company would receive or pay to terminate the swaps at the reporting date (Level 2). The Company’s bunker swaps do not qualify for hedge accounting and bunker price differentials paid or received under the swap agreements are recognized under “(Gain)/Loss on forward freight agreements and bunker swaps”.
Taxation	z) Taxation
Offering costs	aa) Offering costs
Share repurchases	ab) Share repurchases
Evaluation of purchase transactions	ac) Evaluation of purchase transactions:
Other Recent accounting pronouncements - adopted	Other accounting pronouncements – adopted: Statement of Cash Flows (230): In November 2016, the FASB issued ASU 2016-18, “Statement of Cash Flows (230): Restricted Cash”. The amendments in this update require that a statement of cash flows explains the change during the period in the total amount of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The Company adopted this accounting standard update as of January 1, 2018, and this presentation was applied retrospectively to all periods presented as required by the guidance. The prior periods have been adjusted to conform to current period presentation, which resulted in a) a decrease in cash flows used in operating activities by $216 and an increase in cash flows used in investing activities of $209 for the year ended December 31, 2016 compared to the amounts previously reported of ($33,448) and ($13,216), respectively and b) an increase in cash flows provided by operating activities by $1,834 and an increase in cash flows used in investing activities of $249 for the year ended December 31, 2017 compared to the amounts previously reported of $80,970 and ($126,852), respectively, related to changes in restricted cash amounts. Moreover, the beginning period and the ending period cash balances now include restricted cash.
Recent accounting pronouncements - not yet adopted	Recent accounting pronouncements - not yet adopted: Financial Instruments - Credit Losses (Topic 326) Fair Value Measurement (Topic 820):

Basis of Presentation and Gen_2

Basis of Presentation and General Information (Tables)	12 Months Ended
	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
List of Subsidiaries	Date Wholly Owned Subsidiaries Vessel Name DWT Delivered to Star Bulk Year Built 1 Sea Diamond Shipping LLC Goliath 209,537 July 15, 2015 2015 2 Pearl Shiptrade LLC Gargantua 209,529 April 2, 2015 2015 3 Star Ennea LLC Star Poseidon 209,475 February 26, 2016 2016 4 Coral Cape Shipping LLC Maharaj 209,472 July 15, 2015 2015 5 Star Castle II LLC Star Leo (1) 207,939 May 14, 2018 2018 6 ABY Eleven Ltd Star Laetitia 207,896 August 3, 2018 2017 7 Domus Shipping LLC Star Ariadne 207,812 March 28, 2017 2017 8 Star Breezer LLC Star Virgo 207,810 March 1, 2017 2017 9 Star Seeker LLC Star Libra (1) 207,765 June 6, 2016 2016 10 ABY Nine Ltd Star Sienna 207,721 August 3, 2018 2017 11 Clearwater Shipping LLC Star Marisa 207,709 March 11 2016 2016 12 ABY Ten Ltd Star Karlie 207,566 August 3, 2018 2016 13 Star Castle I LLC Star Eleni (1) 207,555 January 3, 2018 2018 14 Festive Shipping LLC Star Magnanimus 207,490 March 26, 2018 2018 15 New Era II Shipping LLC Debbie H 206,861 May 28, 2019 2019 16 New Era III Shipping LLC Star Ayesha 206,852 July 15, 2019 2019 17 New Era I Shipping LLC Katie K 206,839 April 16, 2019 2019 18 Cape Ocean Maritime LLC Leviathan 182,511 September 19, 2014 2014 19 Cape Horizon Shipping LLC Peloreus 182,496 July 22, 2014 2014 20 Star Nor I LLC Star Claudine (1) 181,258 July 6, 2018 2011 21 Star Nor II LLC Star Ophelia (1) 180,716 July 6, 2018 2010 22 Christine Shipco LLC Star Martha 180,274 October 31, 2014 2010 23 Sandra Shipco LLC Star Pauline 180,233 December 29, 2014 2008 24 Pacific Cape Shipping LLC Pantagruel 180,181 July 11, 2014 2004 25 Star Borealis LLC Star Borealis 179,678 September 9, 2011 2011 26 Star Polaris LLC Star Polaris 179,546 November 14, 2011 2011 27 Star Nor III LLC Star Lyra (1) 179,147 July 6, 2018 2009 28 Star Regg II LLC Star Janni 178,978 January 7, 2019 2010 29 Star Regg I LLC Star Marianne 178,906 January 14, 2019 2010 30 Star Trident V LLC Star Angie 177,931 October 29, 2014 2007 31 Sky Cape Shipping LLC Big Fish 177,662 July 11, 2014 2004 32 Global Cape Shipping LLC Kymopolia 176,990 July 11, 2014 2006 33 Star Trident XXV Ltd. Star Triumph 176,343 December 8, 2017 2004 34 ABY Fourteen Ltd Star Scarlett 175,800 August 3, 2018 2014 35 ABY Fifteen Ltd Star Audrey 175,125 August 3, 2018 2011 36 Sea Cape Shipping LLC Big Bang 174,109 July 11, 2014 2007 37 ABY I LLC Star Paola 115,259 August 3, 2018 2011 38 ABM One Ltd Star Eva 106,659 August 3, 2018 2012 39 Nautical Shipping LLC Amami 98,681 July 11, 2014 2011 40 Majestic Shipping LLC Madredeus 98,681 July 11, 2014 2011 41 Star Sirius LLC Star Sirius 98,681 March 7, 2014 2011 42 Star Vega LLC Star Vega 98,681 February 13, 2014 2011 43 ABY II LLC Star Aphrodite 92,006 August 3, 2018 2011 44 Augustea Bulk Carrier Ltd Star Piera 91,952 August 3, 2018 2010 45 Augustea Bulk Carrier Ltd Star Despoina 91,945 August 3, 2018 2010 46 Star Nor IV LLC Star Electra (1) 83,494 July 6, 2018 2011 47 Star Alta I LLC Star Angelina 82,981 December 5, 2014 2006 48 Star Alta II LLC Star Gwyneth 82,790 December 5, 2014 2006 49 Star Trident I LLC Star Kamila 82,769 September 3, 2014 2005 50 Star Nor VI LLC Star Luna (1) 82,687 July 6, 2018 2008 51 Star Nor V LLC Star Bianca (1) 82,672 July 6, 2018 2008 52 Grain Shipping LLC Pendulum 82,619 July 11, 2014 2006 53 Star Trident XIX LLC Star Maria 82,598 November 5, 2014 2007 54 Star Trident XII LLC Star Markella 82,594 September 29, 2014 2007 55 Star Trident IX LLC Star Danai 82,574 October 21, 2014 2006 56 ABY Seven Ltd Star Jeanette 82,567 August 3, 2018 2014 57 Star Trident XI LLC Star Georgia 82,298 October 14, 2014 2006 58 Star Trident VIII LLC Star Sophia 82,269 October 31, 2014 2007 59 Star Trident XVI LLC Star Mariella 82,266 September 19, 2014 2006 60 Star Trident XIV LLC Star Moira 82,257 November 19, 2014 2006 61 Star Trident XVIII LLC Star Nina 82,224 January 5, 2015 2006 62 Star Trident X LLC Star Renee 82,221 December 18, 2014 2006 63 Star Trident II LLC Star Nasia 82,220 August 29, 2014 2006 64 Star Trident XIII LLC Star Laura 82,209 December 8, 2014 2006 65 Star Trident XV LLC Star Jennifer 82,209 April 15, 2015 2006 66 Star Nor VIII LLC Star Mona (1) 82,188 July 6, 2018 2012 67 Star Trident XVII LLC Star Helena 82,187 December 29, 2014 2006 68 Star Nor VII LLC Star Astrid (1) 82,158 July 6, 2018 2012 69 Waterfront Two Ltd Star Alessia 81,944 August 3, 2018 2017 70 Star Nor IX LLC Star Calypso (1) 81,918 July 6, 2018 2014 71 Star Gaia LLC Star Charis 81,711 March 22, 2017 2013 72 Star Elpis LLC Star Suzanna 81,711 May 15, 2017 2013 73 Mineral Shipping LLC Mercurial Virgo 81,545 July 11, 2014 2013 74 Star Nor X LLC Stardust (1) 81,502 July 6, 2018 2011 75 Star Nor XI LLC Star Sky (1) 81,466 July 6, 2018 2010 76 ABY III LLC Star Lydia 81,187 August 3, 2018 2013 77 ABY IV LLC Star Nicole 81,120 August 3, 2018 2013 78 ABY Three Ltd Star Virginia 81,061 August 3, 2018 2015 79 Star Nor XII LLC Star Genesis (1) 80,705 July 6, 2018 2010 80 Star Nor XIII LLC Star Flame (1) 80,448 July 6, 2018 2011 81 Star Trident III LLC Star Iris 76,466 September 8, 2014 2004 82 Star Trident XX LLC Star Emily 76,417 September 16, 2014 2004 83 Orion Maritime LLC Idee Fixe (1) 63,458 March 25, 2015 2015 84 Primavera Shipping LLC Roberta (1) 63,426 March 31, 2015 2015 85 Success Maritime LLC Laura (1) 63,399 April 7, 2015 2015 86 Ultra Shipping LLC Kaley (1) 63,283 June 26, 2015 2015 87 Blooming Navigation LLC Kennadi 63,262 January 8, 2016 2016 88 Jasmine Shipping LLC Mackenzie 63,226 March 2, 2016 2016 89 STAR LIDA I SHIPPING LLC Apus (1) 63,123 July 16, 2019 2014 90 Star Nor XV LLC Star Wave (1) 61,491 July 6, 2018 2017 91 Star Challenger I LLC Star Challenger (1) 61,462 December 12, 2013 2012 92 Star Challenger II LLC Star Fighter (1) 61,455 December 30, 2013 2013 93 Star Axe II LLC Star Lutas 61,347 January 6, 2016 2016 94 Aurelia Shipping LLC Honey Badger 61,320 February 27, 2015 2015 95 Rainbow Maritime LLC Wolverine 61,292 February 27, 2015 2015 96 Star Axe I LLC Star Antares 61,258 October 9, 2015 2015 97 ABY Five Ltd Star Monica 60,935 August 3, 2018 2015 98 Star Asia I LLC Star Aquarius 60,916 July 22, 2015 2015 99 Star Asia II LLC Star Pisces (1) 60,916 August 7, 2015 2015 100 Star Nor XIV LLC Star Glory (1) 58,680 July 6, 2018 2012 101 STAR LIDA XI SHIPPING LLC Pyxis (1) 56,615 August 19, 2019 2013 102 STAR LIDA VIII SHIPPING LLC Hydrus (1) 56,604 August 8, 2019 2013 103 STAR LIDA IX SHIPPING LLC Leo (1) 56,582 July 15, 2019 2013 104 Star Trident VII LLC Diva 56,582 July 24, 2017 2011 105 STAR LIDA VI SHIPPING LLC D.Centaurus (1) 56,559 September 18, 2019 2012 106 STAR LIDA VII SHIPPING LLC Hercules (1) 56,545 July 16, 2019 2012 107 STAR LIDA X SHIPPING LLC Pegasus (1) 56,540 July 15, 2019 2013 108 STAR LIDA III SHIPPING LLC Cepheus (1) 56,539 July 16, 2019 2012 109 STAR LIDA IV SHIPPING LLC Columba (1) 56,530 July 23, 2019 2012 110 STAR LIDA V SHIPPING LLC Dorado (1) 56,507 July 16, 2019 2013 111 STAR LIDA II SHIPPING LLC Aquila (1) 56,506 July 15, 2019 2012 112 Star Regg III LLC Star Bright 55,783 October 10, 2018 2010 113 Glory Supra Shipping LLC Strange Attractor 55,742 July 11, 2014 2006 114 Star Omicron LLC Star Omicron 53,489 April 17, 2008 2005 115 Star Zeta LLC Star Zeta 52,994 January 2, 2008 2003 116 Star Theta LLC Star Theta 52,425 December 6, 2007 2003 Total dwt 12,859,300
List of Non-vessel owning subsidiaries	Wholly Owned Subsidiaries 1 Star Bulk Management Inc. 37 Cape Confidence Shipping LLC 2 Starbulk S.A. 38 Cape Runner Shipping LLC 3 Star Bulk Manning LLC 39 Olympia Shiptrade LLC 4 Star Bulk Shipmanagement Company (Cyprus) Limited 40 Victory Shipping LLC 5 Candia Shipping Limited (ex Optima Shipping Limited) 41 Star Cape I LLC 6 Star Omas LLC 42 Star Cape II LLC 7 Star Synergy LLC 43 Positive Shipping Company 8 Oceanbulk Shipping LLC 44 OOCape1 Holdings LLC 9 Oceanbulk Carriers LLC 45 Oday Marine LLC 10 International Holdings LLC 46 Searay Maritime LLC 11 Star Ventures LLC 47 Lowlands Beilun Shipco LLC 12 Star Logistics LLC (ex Dry Ventures LLC) 48 Star Trident VI LLC 13 Unity Holding LLC 49 KMSRX Holdings LLC 14 Star Bulk (USA) LLC 50 Dioriga Shipping Co. 15 Star Trident XXI LLC 51 Star Trident XXX LLC 16 Star Trident XXIV LLC 52 Star Trident IV LLC 17 Star Trident XXVII LLC 53 Pacific Ventures Holdings LLC 18 Star Trident XXXI LLC 54 Star Mare LLC 19 Star Trident XXIX LLC 55 Star Regg IV LLC 20 Star Trident XXVIII LLC 56 Star Regg V LLC 21 Star Trident XXVI LLC 57 Star Regg VI LLC 22 Star Trident XXII LLC 58 Star Regg VII LLC 23 Star Trident XXIII LLC 59 Star Sege Ltd 24 Star Alpha LLC 60 Star Gamma LLC 25 Star Bulk Norway AS 61 Star Delta LLC 26 Star New Era LLC 62 Star Epsilon LLC 27 Star Thor LLC 63 Star Kappa LLC 28 Star ABY LLC 64 Star Aurora LLC 29 ABY Group Holding Ltd 65 Star Uranus LLC 30 Star Regina LLC 66 Star Trident VII LLC 31 Star Logistics Management S.A. 67 Star Trident XII LLC 32 Gravity Shipping LLC 68 Star Trident XIII LLC 33 White Sand Shipping LLC 69 Star Trident XVI LLC 34 Premier Voyage LLC 70 Star Bulk (Singapore) Pte. Ltd 35 L.A. Cape Shipping LLC 71 Star Bulk Germany GmbH 36 Star Cosmo LLC
Charter Revenue Percentage	Charterer 2017 2018 2019 A N/A 15% 13% B 14% N/A N/A

Transactions with Related Par_2

Transactions with Related Parties (Tables)	12 Months Ended
	Dec. 31, 2019
Related Party Transactions [Abstract]
Schedule of related party transactions	Balance Sheet December 31, 2018 December 31, 2019 Due from related parties Oceanbulk Maritime and its affiliates (d) $ 85 $ 327 Interchart (a) - 11 AOM (l) - 195 Starocean (j) 65 41 Sellers of the Augustea Vessels (f) 867 - Songa Shipmanagement Ltd. (g) 305 - Product Shipping & Trading S.A. - 16 Due from related parties $ 1,322 $ 590 Due to related parties Management and Directors Fees (b) $ 236 $ 246 Sydelle (h), (i) 302 19 Augustea Technoservices Ltd. (f) 1,111 2,879 Coromel Maritime Limited (m) - 873 Due to related parties $ 1,649 $ 4,017 Statements of Operations Years ended December 31, 2017 2018 2019 Voyage expenses-Interchart (a) $ (3,300) $ (3,400) (3,850) Consultancy fees (b) (493) (534) (655) Directors compensation (b) (145) (159) (179) Office rent - Combine Marine Ltd. & Alma Properties (c) (39) (41) (39) Voyage revenues - profit sharing agreement-Sydelle (h) (329) (875) - Management fees- Augustea Technoservices Ltd. (f) - (2,309) (6,564) Management fees- Songa Shipmanagement Ltd. (g) - (376) (32) General and administrative expenses - Oceanbulk Maritime and its affiliates (d) (284) (322) (324) Charter - in hire expenses - AOM (l) - - (2,589) Charter - in hire expenses - Sydelle (i) - - (5,505) Charter - in hire expenses - Coromel (m) - - (5,723) Charter - in hire expenses - Eagle Bulk (n) - - (1,908)

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2019
Inventory Disclosure [Abstract]
Schedule of inventories	December 31, 2018 December 31, 2019 Lubricants $ 12,071 $ 12,293 Bunkers 15,365 38,860 Total $ 27,436 $ 51,153

Vessels and other fixed asset_2

Vessels and other fixed assets, net (Tables)	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Schedule of vessels and other fixed assets, net	Vessel cost Accumulated depreciation Net Book Value Balance, December 31, 2017 2,186,856 -411,775 1,775,081 - Transfer from advances for vessels under construction and acquisition of vessels 163,138 - 163,138 - Acquisitions, improvements and other vessel costs 844,474 - 844,474 - Vessel disposal/ transfer to Held for sale (5,949) - (5,949) - Impairment loss (83,256) 65,472 (17,784) - Depreciation for the period - (102,852) (102,852) Balance, December 31, 2018 $ 3,105,263 $ -449,155 $ 2,656,108 - Transfer from advances for vessels under construction and acquisition of vessels 157,589 - 157,589 - Acquisitions, improvements and other vessel costs 335,671 - 335,671 - Vessel disposal (163,049) 106,899 (56,150) - Impairment loss (24,551) 21,140 (3,411) - Depreciation for the period - (124,280) (124,280) Balance, December 31, 2019 $ 3,410,923 $ (445,396) $ 2,965,527

Advances for vessels under co_2

Advances for vessels under construction and acquisition of vessels (Tables)	12 Months Ended
	Dec. 31, 2019
Advances for vessels under construction and acquisition of vessels [Abstract]
Advances for vessels under construction and acquisition of vessels	Balance, December 31, 2017 $ 48,574 - Additions 129,749 - OCC Vessels shares acquisition 42,962 - Capitalized interest 1,753 - Transfers to Vessel cost (163,138) Balance, December 31, 2018 59,900 - Additions 96,671 - Capitalized interest 1,018 - Transfers to Vessel cost (157,589) Balance, December 31, 2019 -

Lease financing (Tables)

Lease financing (Tables)	12 Months Ended
	Dec. 31, 2019
Lease Commitments Tables Abstract
Capital lease obligations, Principal payments	Twelve month periods ending Amount December 31, 2020 $ 69,820 December 31, 2021 68,255 December 31, 2022 66,144 December 31, 2023 137,160 December 31, 2024 25,809 December 31, 2025 and thereafter 122,318 Total bareboat lease minimum payments $ 489,506 Unamortized debt issuance costs (3,936) Total bareboat lease minimum payments, net $ 485,570 Excluding bareboat lease interest (63,594) Lease commitments – short term 52,145 Lease commitments – long term 369,831

Fair value of Above _ Below M_2

Fair value of Above / Below Market Acquired Time Charters (Tables)	12 Months Ended
	Dec. 31, 2019
Fair Value Of Above Below Market Acquired Time Charters Tables Abstract
Estimated aggregate amortization expense of the above market acquired time charters	Twelve month periods ending Amount December 31, 2020 $ 1,184 December 31, 2021 924 December 31, 2022 365 Total $ 2,473

Long-term debt (Tables)

Long-term debt (Tables)	12 Months Ended
	Dec. 31, 2019
Long-term Debt, by Current and Noncurrent [Abstract]
Long-term debt, Principal payments	Twelve month periods ending Amount December 31, 2020 $ 150,350 December 31, 2021 144,621 December 31, 2022 166,764 December 31, 2023 361,263 December 31, 2024 116,272 December 31, 2025 and thereafter 186,767 Total Long term debt $ 1,126,037 Unamortized debt issuance costs (15,098) Total Long term debt, net $ 1,110,939 Current portion of long term debt 150,350 Long term debt, net 960,589
Interest and finance costs	Years ended December 31, 2017 2018 2019 Interest on financing agreements $ 48,814 $ 69,977 $ 81,393 Less: Interest capitalized (2,423) (1,753) (1,018) Reclassification adjustments of interest rate swap loss/(gain) transferred to Interest and finance costs from Other Comprehensive Income (Note 18) 852 (3) - Amortization of debt issuance costs 2,660 3,253 5,590 Other bank and finance charges 555 2,241 1,652 Interest and finance costs $ 50,458 $ 73,715 $ 87,617

Equity Incentive Plans (Tables)

Equity Incentive Plans (Tables)	12 Months Ended
	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Schedule of Share-based Compensation, Restricted Shares, Activity	Number of shares Weighted Average Grant Date Fair Value Unvested as at January 1, 2017 385,000 $ 4.82 Granted 944,000 9.59 Vested (1,049,000) 8.24 Unvested as at December 31, 2017 280,000 $ 8.09 Unvested as at January 1, 2018 280,000 $ 8.09 Granted 672,500 11.68 Vested (809,500) 10.29 Unvested as at December 31, 2018 143,000 $ 12.49 Unvested as at January 1, 2019 143,000 $ 12.49 Granted 885,000 8.13 Vested (756,962) 8.54 Unvested as at December 31, 2019 271,038 $ 9.28
Schedule of Share-based Compensation, Stock Options, Activity	Options Number of options Weighted average exercise price Weighted Average Grant Date Fair Value Outstanding at beginning of period 104,250 $ 27.5 $ 7.0605 Granted - - - Vested - - - Outstanding at end of period 104,250 $ 27.5 $ 7.0605

Earnings _ Loss per share (Tabl

Earnings / Loss per share (Tables)	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Schedule of Earnings / (Loss) per share	Years ended December 31, 2017 2018 2019 Income / (Loss) : Net income / (loss) $ (9,771) $ 58,397 $ (16,201) Basic earnings / (loss) per share: Weighted average common shares outstanding, basic 63,034,394 77,061,227 93,735,549 Basic earnings / (loss) per share $ (0.16) $ 0.76 $ (0.17) Effect of dilutive securities: Dillutive effect of non vested shares - 264,884 - Weighted average common shares outstanding, diluted 63,034,394 77,326,111 93,735,549 Diluted earnings / (loss) per share $ (0.16) $ 0.76 $ (0.17)

Accrued liabilities (Tables)

Accrued liabilities (Tables)	12 Months Ended
	Dec. 31, 2019
Accrued Liabilities [Abstract]
Schedule of accrued liabilities	December 31, 2018 December 31, 2019 Audit fees $ 295 $ 232 Legal fees 34 40 Other professional fees 1,502 1,540 Vessel Operating and voyage expenses 6,514 37,555 Loan interest and financing fees 8,277 7,394 Income tax 232 - Total Accrued Liabilities $ 16,854 $ 46,761

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Schedule of future minimum contractual obligations	Twelve month periods ending December 31, + inflows/ - outflows Total 2020 2021 2022 2023 2024 2025 and thereafter Future, minimum, non-cancellable charter revenue (1) $ 15,349 $ 15,349 $ - $ - $ - $ - $ - Future, minimum, charter-in hire payments (2) (3,894) (3,894) - - - - - Vessel scrubbers (3) (48,634) (48,634) - - - - - Office rent (1,223) (327) (329) (314) (210) (43) - Total $ (38,402) $ (37,506) $ (329) $ (314) $ (210) $ (43) $ -

Voyage revenues (Tables)

Voyage revenues (Tables)	12 Months Ended
	Dec. 31, 2019
Voyage Revenues Tables Abstract
Voyage revenues	Years ended December 31, 2017 2018 2019 Time charters $ 240,529 $ 397,499 $ 373,927 Voyage charters 102,977 253,812 437,779 Pool revenues 574 250 9,659 $ 344,080 $ 651,561 $ 821,365

Voyage and Vessel operating e_2

Voyage and Vessel operating expenses (Tables)	12 Months Ended
	Dec. 31, 2019
Costs and Expenses [Abstract]
Voyage expenses	Years ended December 31, 2017 2018 2019 Voyage expenses Port charges $ 21,060 $ 37,215 $ 63,576 Bunkers 34,997 72,287 146,089 Commissions – third parties 3,438 6,179 6,828 Commissions – related parties (Note 3) 3,300 3,400 3,850 Miscellaneous 1,887 2,515 2,619 Total voyage expenses $ 64,682 $ 121,596 $ 222,962
Vessel operating expenses	Vessel operating expenses Crew wages and related costs $ 63,074 $ 80,360 $ 103,701 Insurances 6,314 7,544 10,311 Maintenance, repairs, spares and stores 18,589 26,368 25,675 Lubricants 7,016 8,494 9,833 Tonnage taxes 2,565 1,506 2,087 Pre-delivery and Pre-joining expenses 1,925 1,234 1,507 Miscellaneous 1,945 3,366 6,948 Total vessel operating expenses $ 101,428 $ 128,872 $ 160,062

Fair value measurements and H_2

Fair value measurements and Hedging (Tables)	12 Months Ended
	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Derivative instruments effect on statement of operations	Years ended December 31, 2017 2018 2019 Consolidated Statement of Operations Gain/(loss) on derivative financial instruments, net Unrealized gain/(loss) after de-designation of accounting hedging relationship (April 1, 2015) $ 2,802 $ 140 $ - Realized gain/(loss) after de-designation of accounting hedging relationship (April 1, 2015) (2,556) (141) - Write-off of unrealized losses related to forecasted transactions which are no longer considered probable reclassified from other comprehensive income/(loss) - 708 - Ineffective portion of cash flow hedges - - - Total Gain/(loss) on derivative financial instruments, net $ 246 $ 707 $ - Interest and finance costs Reclassification adjustments of interest rate swap loss/(gain) transferred to Interest and finance costs from Other comprehensive income/(loss) (Note 9) (852) 3 - Total Gain/(loss) recognized $ (852) $ 3 $ - Gain/(loss) on forward freight agreements and bunker swaps Realized gain/(loss) on forward freight agreements (877) (599) 6,043 Realized gain/(loss) on bunker swaps - 1,491 (1,386) Unrealized gain/(loss) on forward freight agreements (24) 520 (321) Unrealized gain/(loss) on bunker swaps 60 (1,859) 75 Total Gain/(loss) recognized $ (841) $ (447) $ 4,411
Fair value measurements on a recurring basis	Quoted Prices in Active Markets for Identical Assets (Level 1) December 31, 2018 December 31, 2019 (not designated as cash flow hedges) (designated as cash flow hedges) (not designated as cash flow hedges) (designated as cash flow hedges) ASSETS Forward freight agreements - asset position $ 537 - $ 216 - Total $ 537 - $ 216 - LIABILITIES Bunker swaps - liability position 1,799 - $ 1,724 - Total $ 1,799 - $ 1,724 -
Fair value measurements on a nonrecurring basis	Long-lived assets held and used Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Impairment loss (Level 1) (Level 2) (Level 3) Held for sale $ - $ 5,949 $ - $ 1,606 Vessels, net $ - $ 14,893 $ - $ 16,178 TOTAL $ - $ 20,842 $ - $ 17,784 Long-lived assets held and used Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Impairment loss (Level 1) (Level 2) (Level 3) Vessels, net $ - $ 24,475 $ - $ 3,411 TOTAL $ - $ 24,475 $ - $ 3,411

Subsequent Events (Tables)

Subsequent Events (Tables)	12 Months Ended
	Dec. 31, 2019
Subsequent Events
Schedule of Derivative Instruments	Counterparty Inception Expiry Fixed Rate Amortizing Notional amount Average Annual amortization ING 29-Mar-20 29-Mar-26 0.70% from $29.96 mil to $17.65 mil $1.2 million DNB 30-Mar-20 28-Sep-23 0.64% from $128.91 mil to $51.02 mil $6.0 million SEB 30-Mar-20 28-Sep-23 0.63% from $51.57 mil to $20.41 mil $2.4 million ING 2-Apr-20 2-Oct-25 0.70% from $19.69 mil to $9.84 mil $1.9 million ING 2-Apr-20 2-Oct-25 0.70% from $19.69 mil to $9.84 mil $1.9 million ING 3-Apr-20 3-Apr-23 0.68% from $16.16 mil to $12.74 mil $0.3 million SEB 30-Apr-20 30-Jan-25 0.73% from $29.44 mil to $19.25 mil $2.7 million SEB 30-Apr-20 30-Jan-25 0.73% from $29.44 mil to $19.25 mil $2.7 million

Basis of Presentation and Gen_3

Basis of Presentation and General Information - Vessels in Operation (Table) (Details)	12 Months Ended
	Dec. 31, 2019
Goliath
Vessel
DWT	209,537
Delivery Date	July 15, 2015
Year Built	2015
Gargantua
Vessel
DWT	209,529
Delivery Date	April 2, 2015
Year Built	2015
Star Poseidon
Vessel
DWT	209,475
Delivery Date	February 26, 2016
Year Built	2016
Maharaj
Vessel
DWT	209,472
Delivery Date	July 15, 2015
Year Built	2015
Star Leo
Vessel
DWT	207,939	[1]
Delivery Date	May 14, 2018	[1]
Year Built	2018	[1]
Star Laetitia
Vessel
DWT	207,896
Delivery Date	August 3, 2018
Year Built	2017
Star Ariadne
Vessel
DWT	207,812
Delivery Date	March 28, 2017
Year Built	2017
Star Virgo
Vessel
DWT	207,810
Delivery Date	March 1, 2017
Year Built	2017
Star Libra
Vessel
DWT	207,765	[1]
Delivery Date	June 6, 2016	[1]
Year Built	2016	[1]
Star Sienna
Vessel
DWT	207,721
Delivery Date	August 3, 2018
Year Built	2017
Star Marisa
Vessel
DWT	207,709
Delivery Date	March 11, 2016
Year Built	2016
Star Karlie
Vessel
DWT	207,566
Delivery Date	August 3, 2018
Year Built	2016
Star Eleni
Vessel
DWT	207,555	[1]
Delivery Date	January 3, 2018	[1]
Year Built	2018	[1]
Star Magnanimus
Vessel
DWT	207,490
Delivery Date	March 26, 2018
Year Built	2018
Debbie H
Vessel
DWT	206,861
Delivery Date	May 28, 2019
Year Built	2019
Star Ayesha
Vessel
DWT	206,852
Delivery Date	July 15, 2019
Year Built	2019
Katie K
Vessel
DWT	206,839
Delivery Date	April 16, 2019
Year Built	2019
Leviathan
Vessel
DWT	182,511
Delivery Date	September 19, 2014
Year Built	2014
Peloreus
Vessel
DWT	182,496
Delivery Date	July 22, 2014
Year Built	2014
Star Claudine
Vessel
DWT	181,258	[1]
Delivery Date	July 6, 2018	[1]
Year Built	2011	[1]
Star Ophelia
Vessel
DWT	180,716	[1]
Delivery Date	July 6, 2018	[1]
Year Built	2010	[1]
Star Martha
Vessel
DWT	180,274
Delivery Date	October 31, 2014
Year Built	2010
Star Pauline
Vessel
DWT	180,233
Delivery Date	December 29, 2014
Year Built	2008
PantagrueI
Vessel
DWT	180,181
Delivery Date	July 11, 2014
Year Built	2004
Star Borealis
Vessel
DWT	179,678
Delivery Date	September 9, 2011
Year Built	2011
Star Polaris
Vessel
DWT	179,546
Delivery Date	November 14, 2011
Year Built	2011
Star Lyra
Vessel
DWT	179,147	[1]
Delivery Date	July 6, 2018	[1]
Year Built	2009	[1]
Star Janni
Vessel
DWT	178,978
Delivery Date	January 7, 2019
Year Built	2010
Star Marianne
Vessel
DWT	178,906
Delivery Date	January 14, 2019
Year Built	2010
Star Angie
Vessel
DWT	177,931
Delivery Date	October 29, 2014
Year Built	2007
Big Fish
Vessel
DWT	177,662
Delivery Date	July 11, 2014
Year Built	2004
Kymopolia
Vessel
DWT	176,990
Delivery Date	July 11, 2014
Year Built	2006
Star Triumph
Vessel
DWT	176,343
Delivery Date	December 8, 2017
Year Built	2004
Star Scarlett
Vessel
DWT	175,800
Delivery Date	August 3, 2018
Year Built	2014
Star Audrey
Vessel
DWT	175,125
Delivery Date	August 3, 2018
Year Built	2011
Big Bang
Vessel
DWT	174,109
Delivery Date	July 11, 2014
Year Built	2007
Star Paola
Vessel
DWT	115,259
Delivery Date	August 3, 2018
Year Built	2011
Star Eva
Vessel
DWT	106,659
Delivery Date	August 3, 2018
Year Built	2012
Amami
Vessel
DWT	98,681
Delivery Date	July 11, 2014
Year Built	2011
Madredeus
Vessel
DWT	98,681
Delivery Date	July 11, 2014
Year Built	2011
Star Sirius
Vessel
DWT	98,681
Delivery Date	March 7, 2014
Year Built	2011
Star Vega
Vessel
DWT	98,681
Delivery Date	February 13, 2014
Year Built	2011
Star Aphrodite
Vessel
DWT	92,006
Delivery Date	August 3, 2018
Year Built	2011
Star Piera
Vessel
DWT	91,952
Delivery Date	August 3, 2018
Year Built	2010
Star Despoina
Vessel
DWT	91,945
Delivery Date	August 3, 2018
Year Built	2010
Star Electra
Vessel
DWT	83,494	[1]
Delivery Date	July 6, 2018	[1]
Year Built	2011	[1]
Star Angelina
Vessel
DWT	82,981
Delivery Date	December 5, 2014
Year Built	2006
Star Gwyneth
Vessel
DWT	82,790
Delivery Date	December 5, 2014
Year Built	2006
Star Kamila
Vessel
DWT	82,769
Delivery Date	September 3, 2014
Year Built	2005
Star Luna
Vessel
DWT	82,687	[1]
Delivery Date	July 6, 2018	[1]
Year Built	2008	[1]
Star Bianca
Vessel
DWT	82,672	[1]
Delivery Date	July 6, 2018	[1]
Year Built	2008	[1]
Pendulum
Vessel
DWT	82,619
Delivery Date	July 11, 2014
Year Built	2006
Star Maria
Vessel
DWT	82,598
Delivery Date	November 5, 2014
Year Built	2007
Star Markella
Vessel
DWT	82,594
Delivery Date	September 29, 2014
Year Built	2007
Star Danai
Vessel
DWT	82,574
Delivery Date	October 21, 2014
Year Built	2006
Star Jeanette
Vessel
DWT	82,567
Delivery Date	August 3, 2018
Year Built	2014
Star Georgia
Vessel
DWT	82,298
Delivery Date	October 14, 2014
Year Built	2006
Star Sophia
Vessel
DWT	82,269
Delivery Date	October 31, 2014
Year Built	2007
Star Mariella
Vessel
DWT	82,266
Delivery Date	September 19, 2014
Year Built	2006
Star Moira
Vessel
DWT	82,257
Delivery Date	November 19, 2014
Year Built	2006
Star Nina
Vessel
DWT	82,224
Delivery Date	January 5, 2015
Year Built	2006
Star Renee
Vessel
DWT	82,221
Delivery Date	December 18, 2014
Year Built	2006
Star Nasia
Vessel
DWT	82,220
Delivery Date	August 29, 2014
Year Built	2006
Star Laura
Vessel
DWT	82,209
Delivery Date	December 8, 2014
Year Built	2006
Star Jennifer
Vessel
DWT	82,209
Delivery Date	April 15, 2015
Year Built	2006
Star Mona
Vessel
DWT	82,188	[1]
Delivery Date	July 6, 2018	[1]
Year Built	2012	[1]
Star Helena
Vessel
DWT	82,187
Delivery Date	December 29, 2014
Year Built	2006
Star Astrid
Vessel
DWT	82,158	[1]
Delivery Date	July 6, 2018	[1]
Year Built	2012	[1]
Star Alessia
Vessel
DWT	81,944
Delivery Date	August 3, 2018
Year Built	2017
Star Calypso
Vessel
DWT	81,918	[1]
Delivery Date	July 6, 2018	[1]
Year Built	2014	[1]
Star Charis
Vessel
DWT	81,711
Delivery Date	March 22, 2017
Year Built	2013
Star Suzanna
Vessel
DWT	81,711
Delivery Date	May 15, 2017
Year Built	2013
Mercurial Virgo
Vessel
DWT	81,545
Delivery Date	July 11, 2014
Year Built	2013
Stardust
Vessel
DWT	81,502	[1]
Delivery Date	July 6, 2018	[1]
Year Built	2011	[1]
Star Sky
Vessel
DWT	81,466	[1]
Delivery Date	July 6, 2018	[1]
Year Built	2010	[1]
Star Lydia
Vessel
DWT	81,187
Delivery Date	August 3, 2018
Year Built	2013
Star Nicole
Vessel
DWT	81,120
Delivery Date	August 3, 2018
Year Built	2013
Star Virginia
Vessel
DWT	81,061
Delivery Date	August 3, 2018
Year Built	2015
Star Genesis
Vessel
DWT	80,705	[1]
Delivery Date	July 6, 2018	[1]
Year Built	2010	[1]
Star Flame
Vessel
DWT	80,448	[1]
Delivery Date	July 6, 2018	[1]
Year Built	2011	[1]
Star Iris
Vessel
DWT	76,466
Delivery Date	September 8, 2014
Year Built	2004
Star Emily
Vessel
DWT	76,417
Delivery Date	September 16, 2014
Year Built	2004
Idee Fixe
Vessel
DWT	63,458	[1]
Delivery Date	March 25, 2015	[1]
Year Built	2015	[1]
Roberta
Vessel
DWT	63,426	[1]
Delivery Date	March 31, 2015	[1]
Year Built	2015	[1]
Laura
Vessel
DWT	63,399	[1]
Delivery Date	April 7, 2015	[1]
Year Built	2015	[1]
Kaley
Vessel
DWT	63,283	[1]
Delivery Date	June 26, 2015	[1]
Year Built	2015	[1]
Kennadi
Vessel
DWT	63,262
Delivery Date	January 8, 2016
Year Built	2016
Mackenzie
Vessel
DWT	63,226
Delivery Date	March 2, 2016
Year Built	2016
Apus
Vessel
DWT	63,123	[1]
Delivery Date	July 16, 2019	[1]
Year Built	2014	[1]
Star Wave
Vessel
DWT	61,491	[1]
Delivery Date	July 6, 2018	[1]
Year Built	2017	[1]
Star Challenger
Vessel
DWT	61,462	[1]
Delivery Date	December 12, 2013	[1]
Year Built	2012	[1]
Star Fighter
Vessel
DWT	61,455	[1]
Delivery Date	December 30, 2013	[1]
Year Built	2013	[1]
Star Lutas
Vessel
DWT	61,347
Delivery Date	January 6, 2016
Year Built	2016
Honey Badger
Vessel
DWT	61,320
Delivery Date	February 27, 2015
Year Built	2015
Wolverine
Vessel
DWT	61,292
Delivery Date	February 27, 2015
Year Built	2015
Star Antares
Vessel
DWT	61,258
Delivery Date	October 9, 2015
Year Built	2015
Star Monica
Vessel
DWT	60,935
Delivery Date	August 3, 2018
Year Built	2015
Star Aquarius
Vessel
DWT	60,916
Delivery Date	July 22, 2015
Year Built	2015
Star Pisces
Vessel
DWT	60,916	[1]
Delivery Date	August 7, 2015	[1]
Year Built	2015	[1]
Star Glory
Vessel
DWT	58,680	[1]
Delivery Date	July 6, 2018	[1]
Year Built	2012	[1]
Pyxis
Vessel
DWT	56,615	[1]
Delivery Date	August 19, 2019	[1]
Year Built	2013	[1]
Hydrus
Vessel
DWT	56,604	[1]
Delivery Date	August 8, 2019	[1]
Year Built	2013	[1]
Leo
Vessel
DWT	56,582	[1]
Delivery Date	July 15, 2019	[1]
Year Built	2013	[1]
Diva
Vessel
DWT	56,582
Delivery Date	July 24, 2017
Year Built	2011
D.Centaurus
Vessel
DWT	56,559	[1]
Delivery Date	September 18, 2019	[1]
Year Built	2012	[1]
Hercules
Vessel
DWT	56,545	[1]
Delivery Date	July 16, 2019	[1]
Year Built	2012	[1]
Pegasus
Vessel
DWT	56,540	[1]
Delivery Date	July 15, 2019	[1]
Year Built	2013	[1]
Cepheus
Vessel
DWT	56,539	[1]
Delivery Date	July 16, 2019	[1]
Year Built	2012	[1]
Columba
Vessel
DWT	56,530	[1]
Delivery Date	July 23, 2019	[1]
Year Built	2012	[1]
Dorado
Vessel
DWT	56,507	[1]
Delivery Date	July 16, 2019	[1]
Year Built	2013	[1]
Aquila
Vessel
DWT	56,506	[1]
Delivery Date	July 15, 2019	[1]
Year Built	2012	[1]
Star Bright
Vessel
DWT	55,783
Delivery Date	October 10, 2018
Year Built	2010
Strange Attractor
Vessel
DWT	55,742
Delivery Date	July 11, 2014
Year Built	2006
Star Omicron
Vessel
DWT	53,489
Delivery Date	April 17, 2008
Year Built	2005
Star Zeta
Vessel
DWT	52,994
Delivery Date	January 2, 2008
Year Built	2003
Star Theta
Vessel
DWT	52,425
Delivery Date	December 6, 2007
Year Built	2003
Vessels in operation
Vessel
DWT	12,859,300
[1]	Subject to a bareboat charter with purchase obligation at the expiration of the bareboat charter term (Note 7)

Basis of Presentation and Gen_4

Basis of Presentation and General Information - Risk Concentration (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Voyage revenues
Concentration Risk [Line Items]
Concentration of Risk	10.00%
Charterer A
Concentration Risk [Line Items]
Concentration of Risk	13.00%	15.00%
Accounts receivable	$ 2,876
Charterer B
Concentration Risk [Line Items]
Concentration of Risk			14.00%

Basis of Presentation and Gen_5

Basis of Presentation and General Information (Details)	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Date of Incorporation	Dec. 13, 2006
Number of vessels owned	116
Combined carrying capacity
Property, Plant and Equipment [Line Items]
DWT	12,900,000
Minimum
Property, Plant and Equipment [Line Items]
DWT	52,425
Maximum
Property, Plant and Equipment [Line Items]
DWT	209,537

Significant accounting polici_3

Significant accounting policies (Details)	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Jan. 01, 2019USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Voyage revenues	$ 821,365,000	$ 651,561,000	$ 331,976,000
Provision for doubtful debts	$ 1,607,000	722,000	0
Vessels' depreciation method	straight-line basis
Vessel's useful life	25 years
Vessel salvage value per LWT	$ 300	300
Revenue recognition method	straight-line basis
Number of reportable segments	1
Finance Lease, Right-of-Use Asset		1,047,780,000
Finance Lease, Liability		609,737,000
Weighted-average discount rate	5.66%
Operating Lease, Right-of-Use Asset	$ 1,216,000	0
Operating Lease, Liability	1,216,000	0
Operating Lease, Expense	$ 126,813,000	92,896,000	5,325,000
Operating Lease, Weighted Average Remaining Lease Term	2 years 2 months 1 day
Net cash provided by / (used in) Operating Activities	$ 88,525,000	169,009,000	82,804,000
Net cash provided by / (used in) Investing Activities	(279,837,000)	(325,327,000)	(127,101,000)
Charter-in vessels
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Voyage revenues	185,311,000	127,618,000	6,153,000
Revenue recognized from subleases	15,253,000	18,661,000	3,005,000
Office rental arrangements
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	1,216,000				$ 1,198,000
Operating Lease, Liability	$ 1,216,000				$ 1,198,000
Discount rate	4.00%
Operating Lease, Expense	$ 352,000	$ 403,000
Operating Lease, Weighted Average Remaining Lease Term	3 years 10 months 27 days
Effect of Standard Adoption | ASU 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by / (used in) Operating Activities			1,834,000	$ (216,000)
Net cash provided by / (used in) Investing Activities			249,000	209,000
Balances without Standard Adoption | ASU 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by / (used in) Operating Activities			80,970,000	(33,448,000)
Net cash provided by / (used in) Investing Activities			$ (126,852,000)	$ (13,216,000)

Transactions with Related Par_3

Transactions with Related Parties - Balance Sheet (Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets
Due from related parties	$ 590	$ 1,322
Liabilities
Due to related parties	4,017	1,649
Oceanbulk Maritime and its affiliates (d)
Assets
Due from related parties	327	85
Interchart (a)
Assets
Due from related parties	11	0
AOM (l)
Assets
Due from related parties	195	0
Starocean (j)
Assets
Due from related parties	41	65
Sellers of the Augustea Vessels (f)
Assets
Due from related parties	0	867
Songa Shipmanagement Ltd. (g)
Assets
Due from related parties	0	305
Product Shipping & Trading S.A.
Assets
Due from related parties	16	0
Management and Directors Fees (b)
Liabilities
Due to related parties	246	236
Sydelle (h), (i)
Liabilities
Due to related parties	19	302
Augustea Technoservices Ltd. (f)
Liabilities
Due to related parties	2,879	1,111
Coromel Maritime Limited (m)
Liabilities
Due to related parties	$ 873	$ 0

Transactions with Related Par_4

Transactions with Related Parties - Statements of Operations (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Office rent	$ (126,813)	$ (92,896)	$ (5,325)
Voyage expenses	(222,962)	(121,596)	(64,682)
Management fees	(17,500)	(11,321)	(7,543)
Voyage revenues	821,365	651,561	331,976
General and administrative expenses	(34,819)	(33,972)	(30,955)
Charter - in hire expenses	(126,813)	(92,896)	(5,325)
Interchart (a)
Related Party Transaction [Line Items]
Voyage expenses	(3,850)	(3,400)	(3,300)
Executive officers (b)
Related Party Transaction [Line Items]
Consultancy fees	(655)	(534)	(493)
Directors (b)
Related Party Transaction [Line Items]
Directors compensation	(179)	(159)	(145)
Combine Marine Ltd. and Alma Properties (c)
Related Party Transaction [Line Items]
Office rent	(39)	(41)	(39)
Sydelle (h), (i)
Related Party Transaction [Line Items]
Charter - in hire expenses	(5,505)	0	0
Sydelle (h), (i) | Profit sharing agreement
Related Party Transaction [Line Items]
Voyage revenues	0	(875)	(329)
Augustea Technoservices Ltd. (f)
Related Party Transaction [Line Items]
Management fees	(6,564)	(2,309)	0
Songa Shipmanagement Ltd. (g)
Related Party Transaction [Line Items]
Management fees	(32)	(376)	0
Oceanbulk Maritime and its affiliates (d)
Related Party Transaction [Line Items]
General and administrative expenses	(324)	(322)	(284)
AOM (l)
Related Party Transaction [Line Items]
Charter - in hire expenses	(2,589)	0	0
Coromel Maritime Limited (m)
Related Party Transaction [Line Items]
Charter - in hire expenses	(5,723)	$ 0	$ 0
Eagle Bulk (n)
Related Party Transaction [Line Items]
Charter - in hire expenses	$ (1,908)

Transactions with Related Par_5

Transactions with Related Parties - Additional Information - Interchart (Details) - Interchart Shipping Inc. - USD ($) $ in Thousands	12 Months Ended		14 Months Ended
	Dec. 31, 2020	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2014
Related Party Transaction [Line Items]
Percentage of total outstanding common shares				33.00%
Services Agreement
Related Party Transaction [Line Items]
Monthly lump sum fee		$ 275
Expiration date of agreement		Dec. 31, 2018
New Service Agreement
Related Party Transaction [Line Items]
Monthly lump sum fee			$ 325
Expiration date of agreement			Dec. 31, 2019
New Service Agreement | Subsequent Event
Related Party Transaction [Line Items]
Monthly lump sum fee	$ 315
Expiration date of agreement	Dec. 31, 2020

Transactions with Related Par_6

Transactions with Related Parties - Additional Information - Management and Director Fees (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Consultancy fees	$ 655
Euro
Exchange rate EUR/USD	1.12

Transactions with Related Par_7

Transactions with Related Parties - Additional Information (Details)

2 Months Ended

6 Months Ended

7 Months Ended

12 Months Ended

Oct. 31, 2019USD ($)

Aug. 31, 2019USD ($)

Jul. 06, 2018USD ($)shares

Jun. 28, 2018shares

Aug. 03, 2018shares

Dec. 31, 2019USD ($)

Dec. 31, 2018USD ($)

Dec. 31, 2017USD ($)

Dec. 21, 2016USD ($)

Dec. 21, 2016EUR (€)

Dec. 31, 2012USD ($)

Dec. 31, 2012EUR (€)

Related Party Transaction [Line Items]

Rent expense

$ 126,813,000

$ 92,896,000

$ 5,325,000

Cash portion of the consideration

347,140,000

328,634,000

143,684,000

Outstanding payable

$ 4,017,000

1,649,000

Charter - in period

2 years 2 months 1 day

Combine Marine Ltd

Related Party Transaction [Line Items]

Rent expense per month

$ 2,800

Rent expense

$ 35,000

37,000

35,000

Alma Properties

Related Party Transaction [Line Items]

Leasing agreements, Office space, Term of contract

6 years

6 years

Rent expense per month

$ 300

Rent expense

$ 4,000

4,000

$ 4,000

StarOcean Manning Philippines Inc.

Related Party Transaction [Line Items]

Ownership percentage

25.00%

Equity method investment (included in Other Current Assets)

$ 123,000

$ 50,000

Eagle Bulk

Related Party Transaction [Line Items]

Number of time charter agreements

2

Number of charter-in vessels

2

Euro

Related Party Transaction [Line Items]

Exchange rate EUR/USD

1.12

Euro | Combine Marine Ltd

Related Party Transaction [Line Items]

Rent expense per month | €

€ 2,500

Euro | Alma Properties

Related Party Transaction [Line Items]

Rent expense per month | €

€ 300

Oaktree

Related Party Transaction [Line Items]

Number of directors

4

Voting percentage

33.00%

Oaktree | Oaktree Shareholders Agreement

Related Party Transaction [Line Items]

Number of directors

9

Oaktree | Oaktree Shareholders Agreement | Beneficial Ownership of 40% or more

Related Party Transaction [Line Items]

Number of directors

4

Oaktree | Oaktree Shareholders Agreement | Beneficial Ownership of 25% or more but less than 40%

Related Party Transaction [Line Items]

Number of directors

3

Oaktree | Oaktree Shareholders Agreement | Beneficial Ownership of 15% or more but less than 25%

Related Party Transaction [Line Items]

Number of directors

2

Oaktree | Oaktree Shareholders Agreement | Beneficial Ownership of 5% or more but less than 15%

Related Party Transaction [Line Items]

Number of directors

1

Augustea Vessels

Related Party Transaction [Line Items]

Number of vessels acquired

16

Number of shares issued as part of the final consideration | shares

10,277,335

Songa Vessels

Related Party Transaction [Line Items]

Number of vessels acquired

15

Number of shares issued as part of the final consideration | shares

13,725,000

Songa Vessels | Financed by China Merchants Bank Leasing

Related Party Transaction [Line Items]

Cash portion of the consideration

$ 144,550,000

OCC vessels

Related Party Transaction [Line Items]

Number of vessels acquired

3

Number of shares issued as part of the final consideration | shares

3,304,735

First vessel | Eagle Bulk

Related Party Transaction [Line Items]

Charter - in period

2 months

Charter hire daily rate

$ 16,300

Second vessel | Eagle Bulk

Related Party Transaction [Line Items]

Charter - in period

2 months

Charter hire daily rate

$ 15,800

Inventories (Table) (Details)

Inventories (Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Lubricants	$ 12,293	$ 12,071
Bunkers	38,860	15,365
Total	$ 51,153	$ 27,436

Vessels and Other Fixed Asset_3

Vessels and Other Fixed Assets, Net (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Balance, period start	$ 2,716,008
Transfer from advances for vessels under construction and acquisition of vessels	(157,589)	$ (163,138)
Acquisitions, improvements and other vessel costs	96,671	129,749
Impairment loss	3,411	17,784	$ 0
Depreciation for the period	(124,280)	(102,852)	(82,623)
Balance, period end	2,965,527	2,716,008
Vessel cost
Property, Plant and Equipment [Line Items]
Balance, period start	3,105,263	2,186,856
Transfer from advances for vessels under construction and acquisition of vessels	157,589	163,138
Acquisitions, improvements and other vessel costs	335,671	844,474
Vessel disposal/ transfer to Held for sale	(163,049)	(5,949)
Impairment loss	(24,551)	(83,256)
Balance, period end	3,410,923	3,105,263	2,186,856
Accumulated depreciation
Property, Plant and Equipment [Line Items]
Balance, period start	(449,155)	(411,775)
Vessel disposal	106,899
Impairment loss	21,140	65,472
Depreciation for the period	(124,280)	(102,852)
Balance, period end	(445,396)	(449,155)	(411,775)
Net Book Value
Property, Plant and Equipment [Line Items]
Balance, period start	2,656,108	1,775,081
Transfer from advances for vessels under construction and acquisition of vessels	157,589	163,138
Acquisitions, improvements and other vessel costs	335,671	844,474
Vessel disposal/ transfer to Held for sale	(56,150)	(5,949)
Impairment loss	(3,411)	(17,784)
Depreciation for the period	(124,280)	(102,852)
Balance, period end	$ 2,965,527	$ 2,656,108	$ 1,775,081

Vessels and Other Fixed Asset_4

Vessels and Other Fixed Assets, Net - 2018 (Details) $ / shares in Units, $ in Thousands		6 Months Ended	7 Months Ended	9 Months Ended	11 Months Ended	12 Months Ended
		Jul. 06, 2018$ / sharesshares	Aug. 03, 2018$ / sharesshares	Oct. 10, 2018USD ($)$ / sharesshares	Nov. 16, 2018USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Aug. 27, 2018
Property, Plant and Equipment [Line Items]
Payments to acquire property plant and equipment						$ 347,140	$ 328,634	$ 143,684
Total acquisition cost						$ 96,671	$ 129,749
Star Eleni
Property, Plant and Equipment [Line Items]
Delivery date	[1]					January 3, 2018
Star Magnanimus
Property, Plant and Equipment [Line Items]
Delivery date						March 26, 2018
Star Leo
Property, Plant and Equipment [Line Items]
Delivery date	[1]					May 14, 2018
Songa Vessels
Property, Plant and Equipment [Line Items]
Number of vessels acquired		15
Number of shares issued as part of the final consideration | shares		13,725,000
Total acquisition cost						$ 452,661
Shares Issued, Price Per Share | $ / shares		$ 13.31
Number of vessels financed						10
Augustea Vessels
Property, Plant and Equipment [Line Items]
Number of vessels acquired			16
Number of shares issued as part of the final consideration | shares			10,277,335
Total acquisition cost						$ 327,680
Shares Issued, Price Per Share | $ / shares			$ 14
Star Bright
Property, Plant and Equipment [Line Items]
Delivery date						October 10, 2018
Star Anna
Property, Plant and Equipment [Line Items]
Delivery date						November 16, 2018
Disposal date						Sep. 23, 2019
Total acquisition cost					$ 19,800
Star Delta
Property, Plant and Equipment [Line Items]
Disposal date						Jan. 8, 2019
Step 1 Vessels
Property, Plant and Equipment [Line Items]
Number of operating vessels acquired									3
Step 1 Vessels | Star Bright
Property, Plant and Equipment [Line Items]
Delivery date						Oct. 10, 2018
Number of shares issued as part of the final consideration | shares				291,300
Payments to acquire property plant and equipment				$ 9,167
Total acquisition cost				$ 13,073
Shares Issued, Price Per Share | $ / shares				$ 13.87
[1]	Subject to a bareboat charter with purchase obligation at the expiration of the bareboat charter term (Note 7)

Vessels and Other Fixed Asset_5

Vessels and Other Fixed Assets, Net - 2019 (Details) $ / shares in Units, $ in Thousands	Jan. 14, 2019USD ($)$ / sharesshares	May 27, 2019USD ($)shares	Nov. 16, 2018USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Jan. 07, 2019$ / shares	Aug. 27, 2018
Property, Plant and Equipment [Line Items]
Cash portion of the consideration				$ 347,140	$ 328,634	$ 143,684
Capital leased assets, net amount				$ 798,863	992,777
Number of vessels owned				116
Loss / (gain) on sale of vessels				$ 5,493	0	(2,598)
Total acquisition cost				96,671	129,749
Impairment loss				$ 3,411	$ 17,784	$ 0
First-priority mortgage
Property, Plant and Equipment [Line Items]
Number of vessels owned				80
Amount of vessels pledged as collateral				$ 2,166,419
Cross collateral, Bareboat vessels
Property, Plant and Equipment [Line Items]
Capital leased assets, net amount				$ 798,863
ABN $115,000 Facility
Property, Plant and Equipment [Line Items]
Number of vessels financed				7
BNP Facility
Property, Plant and Equipment [Line Items]
Number of vessels financed				2
Citi $130,000 Facility
Property, Plant and Equipment [Line Items]
Number of vessels financed				11
HSBC $80,000 Facility
Property, Plant and Equipment [Line Items]
Number of vessels financed				8
Step 1 Vessels
Property, Plant and Equipment [Line Items]
Number of operating vessels acquired								3
Katie K
Property, Plant and Equipment [Line Items]
Delivery date				April 16, 2019
Debbie H
Property, Plant and Equipment [Line Items]
Delivery date				May 28, 2019
Star Ayesha
Property, Plant and Equipment [Line Items]
Delivery date				July 15, 2019
Star Janni
Property, Plant and Equipment [Line Items]
Delivery date				January 7, 2019
Star Marianne
Property, Plant and Equipment [Line Items]
Delivery date				January 14, 2019
Star Marianne and Star Janni | Step 1 Vessels
Property, Plant and Equipment [Line Items]
Number of shares issued as part of the consideration | shares	999,336
Cash portion of the consideration	$ 31,772
Total acquisition cost	$ 41,837
Star Janni | Step 1 Vessels
Property, Plant and Equipment [Line Items]
Shares Issued, Price Per Share | $ / shares							$ 10.41
Star Marianne | Step 1 Vessels
Property, Plant and Equipment [Line Items]
Shares Issued, Price Per Share | $ / shares	$ 9.66
Delphin Vessels
Property, Plant and Equipment [Line Items]
Number of operating vessels acquired		11
Number of shares issued as part of the consideration | shares		4,503,370
Cash portion of the consideration		$ 80,000
Total acquisition cost		127,532
Delphin Vessels | CMBL
Property, Plant and Equipment [Line Items]
Description of Capital leases, Term of contract				Bareboat charter for seven years
Sale leaseback transaction, Remaining borrowing capacity		$ 91,431
Star Kappa
Property, Plant and Equipment [Line Items]
Disposal date				Mar. 8, 2019
Star Aurora
Property, Plant and Equipment [Line Items]
Disposal date				Mar. 6, 2019
Star Anna
Property, Plant and Equipment [Line Items]
Delivery date				November 16, 2018
Total acquisition cost			$ 19,800
Disposal date				Sep. 23, 2019
Star Gamma
Property, Plant and Equipment [Line Items]
Disposal date				Sep. 5, 2019
Star Cosmo
Property, Plant and Equipment [Line Items]
Disposal date				Dec. 17, 2019
Star Epsilon
Property, Plant and Equipment [Line Items]
Disposal date				Dec. 9, 2019
Star Delta
Property, Plant and Equipment [Line Items]
Loss / (gain) on sale of vessels				$ 5,493
Star Gamma and Star Anna
Property, Plant and Equipment [Line Items]
Impairment loss				$ 3,411

Advances for vessels under co_3

Advances for vessels under construction and acquisition of vessels (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Advances for vessels under construction and acquisition of vessels [Abstract]
Balance, period start	$ 59,900	$ 48,574
Additions	96,671	129,749
OCC Vessels shares acquisition	0	42,962
Capitalized interest	1,018	1,753
Transfers to Vessel cost	(157,589)	(163,138)
Balance, period end	$ 0	$ 59,900

Advances for vessels under co_4

Advances for vessels under construction and acquisition of vessels (Details) $ in Thousands	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Property, Plant and Equipment [Line Items]
Advances for vessels under construction and acquisition of vessels	$ 0	$ 59,900	$ 48,574
OCC vessels | Financed by CSSC
Property, Plant and Equipment [Line Items]
Capital leased assets, Number of vessels		3
OCC vessels | First OCC Vessel | Financed by CSSC
Property, Plant and Equipment [Line Items]
Capital lease obligation recognised		$ 4,350
OCC vessels | Second OCC Vessel | Financed by CSSC
Property, Plant and Equipment [Line Items]
Capital lease obligation recognised		4,350
Step 1 Acquisition
Property, Plant and Equipment [Line Items]
Advances for vessels under construction and acquisition of vessels		$ 4,880

Lease financing (Table) (Detail

Lease financing (Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Years
Lease commitments - short term	$ 52,145	$ 65,837
Lease commitments - long term	369,831	540,925
Capital Lease Obligations
Years
December 31, 2020	69,820
December 31, 2021	68,255
December 31, 2022	66,144
December 31, 2023	137,160
December 31, 2024	25,809
December 31, 2025 and thereafter	122,318
Total bareboat lease minimum payments	489,506
Unamortized debt issuance costs	(3,936)	$ (2,975)
Total bareboat lease minimum payments, net	485,570
Excluding bareboat lease interest	(63,594)
Lease commitments - short term	52,145
Lease commitments - long term	$ 369,831

Lease financing (Details)

Lease financing (Details) $ in Thousands	4 Months Ended	6 Months Ended	7 Months Ended	9 Months Ended	11 Months Ended	12 Months Ended
	Apr. 30, 2019USD ($)	Jul. 10, 2019USD ($)	Jul. 31, 2019USD ($)	Sep. 27, 2018USD ($)	Nov. 30, 2019USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	May 27, 2019USD ($)
Capital leased assets, net amount						$ 798,863	$ 992,777
Accumulated amortization						72,555	51,956
Interest and finance costs						27,251	26,825	$ 12,590
Proceeds from Sale of Property, Plant, and Equipment						56,632	0	15,153
Payments for bareboat leases						$ 623,892	875,037	86,262
Star Pisces | SK Shipholding S.A.
Description of Capital leases, Term of contract						Bareboat charter for seven years
Vessel purchase price obligation						$ 7,628
Proceeds from Sale of Property, Plant, and Equipment	$ 19,125
Capital leases, Date						April 2019
Star Libra | Ocean Trust Co. Ltd.
Description of Capital leases, Term of contract						Bareboat charter for seven years
Vessel purchase price obligation						$ 18,107
Proceeds from Sale of Property, Plant, and Equipment			$ 33,950
Capital leases, Date						July 2019
Star Challenger | Kyowa Sansho
Description of Capital leases, Term of contract						Bareboat charter for eleven years
Proceeds from Sale of Property, Plant, and Equipment		$ 15,000
Delphin Vessels | CMBL
Description of Capital leases, Term of contract						Bareboat charter for seven years
Sale leaseback transaction, Remaining borrowing capacity									$ 91,431
Delphin Vessels | CMBL | Minimum
Vessel purchase price obligation						$ 975
Delphin Vessels | CMBL | Maximum
Vessel purchase price obligation						3,379
Delphin Scrubbers | CMBL
Sale leaseback transaction, Remaining borrowing capacity			$ 15,000
Amount drawn down						$ 0
Idee Fixe, Roberta, Laura and Kaley | New Yangzijiang
Description of Capital leases, Term of contract						Bareboat charter for eight years
Vessel purchase price obligation						$ 6,000
Capital leased assets, Number of vessels						4
Songa Vessels | CMBL
Sale leaseback transaction, Remaining borrowing capacity						$ 180,000
Songa Vessels | CMBL | Minimum
Vessel purchase price obligation						2,200
Songa Vessels | CMBL | Maximum
Vessel purchase price obligation						8,400
Songa Scrubbers | CMBL
Sale leaseback transaction, Remaining borrowing capacity						$ 19,600
Amount drawn down					$ 12,165
Star Eleni and Star Leo | CMBL
Sale leaseback transaction, Remaining borrowing capacity				$ 57,346
Star Eleni and Star Leo | CSSC
Extinguishment of Debt, Amount				$ 58,112
Star Eleni | CMBL
Description of Capital leases, Term of contract						Bareboat charter for five years
Vessel purchase price obligation						$ 18,231
Star Leo | CMBL
Description of Capital leases, Term of contract						Bareboat charter for five years
Vessel purchase price obligation						$ 20,000
Star Fighter | Kyowa Sansho
Description of Capital leases, Term of contract						Bareboat charter for ten years
Vessel purchase price obligation							2,450
Sale leaseback transaction, Remaining borrowing capacity							16,125
Bareboat lease payments
Payments for bareboat leases						$ 478,807	113,865	$ 20,985
Variable portion of payments for bareboat lease obligations						3-month LIBOR rate of 1.908%
NIBC $32,000 Facility
Extinguishment of Debt, Amount						$ 11,671
HSH Nordbank AG $35,000 Facility
Extinguishment of Debt, Amount		$ 10,874					$ 11,958

Fair value of Above _ Below M_3

Fair value of Above / Below Market Acquired Time Charters (Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Below Market Lease, Net, Amortization Income, Fiscal Year Maturity [Abstract]
December 31, 2020	$ 1,184
December 31, 2021	924
December 31, 2022	365
Total	$ 2,473	$ 3,553

Fair value of Above _ Below M_4

Fair value of Above / Below Market Acquired Time Charters (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization of fair value of above market time charters	$ 336	$ 0	$ 0
Amortization of fair value of below market time charters	2,349	1,820	$ 0
Accumulated amortization of fair value of below market time charters	$ 3,157
Weighted average remaining lease term	2 years 2 months 1 day
Below market time charters | Two Augustea Vessels
Finite-Lived Intangible Assets [Line Items]
Liability recognized	$ 5,373
Amortization of fair value of below market time charters	1,337	$ 1,820
Below market time charters | Star Marianne
Finite-Lived Intangible Assets [Line Items]
Liability recognized	1,269
Amortization of fair value of below market time charters	1,012
Above market time charters | Star Janni
Finite-Lived Intangible Assets [Line Items]
Asset recognized	336
Amortization of fair value of above market time charters	$ 336

Long-term debt - Principal Paym

Long-term debt - Principal Payments (Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Long-term Debt - Principal payments
Current portion of long term debt	$ 150,350	$ 101,007
Long term debt, net	960,589	$ 685,819
Long-term Debt
Long-term Debt - Principal payments
December 31, 2020	150,350
December 31, 2021	144,621
December 31, 2022	166,764
December 31, 2023	361,263
December 31, 2024	116,272
December 31, 2025 and thereafter	186,767
Total Long term debt	1,126,037
Unamortized debt issuance costs	(15,098)
Total Long term debt, net	1,110,939
Current portion of long term debt	150,350
Long term debt, net	$ 960,589

Long-term debt - Interest and f

Long-term debt - Interest and finance costs (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Long-term Debt, by Current and Noncurrent [Abstract]
Interest on financing agreements	$ 81,393	$ 69,977	$ 48,814
Less: Interest capitalized	(1,018)	(1,753)	(2,423)
Reclassification adjustments of interest rate swap loss/(gain) transferred to Interest and finance costs from Other Comprehensive Income (Note 18)	0	(3)	852
Amortization of debt issuance costs	5,590	3,253	2,660
Other bank and finance charges	1,652	2,241	555
Interest and finance costs	$ 87,617	$ 73,715	$ 50,458

Long-term debt - Information Pe

Long-term debt - Information Per Loan 1 (Details) $ in Thousands	1 Months Ended		2 Months Ended	3 Months Ended	4 Months Ended	5 Months Ended	7 Months Ended	9 Months Ended	10 Months Ended	11 Months Ended	12 Months Ended
	Jan. 31, 2020USD ($)	Jan. 30, 2019USD ($)	Mar. 01, 2019USD ($)	Mar. 31, 2019USD ($)	Apr. 30, 2019USD ($)	May 31, 2019USD ($)	Jul. 31, 2019USD ($)	Sep. 30, 2019USD ($)	Oct. 31, 2018USD ($)	Nov. 30, 2019USD ($)	Dec. 31, 2019USD ($)
SEB Facility
Debt Instrument [Line Items]
Initiation date											Jan. 28, 2019
Maximum borrowing capacity											$ 71,420
Number of loan tranches											4
Vessels provided as collateral											The SEB Facility is secured by a first priority mortgage on the vessels Star Laetitia and Star Sienna.
SEB Facility | Tranche A
Debt Instrument [Line Items]
Amount drawn down		$ 32,825
Repayment period											6 years
Number of installments											24
Frequency of payments											quarterly
Balloon installment											$ 18,723
Expiration date											Jan. 31, 2025
SEB Facility | Tranche B
Debt Instrument [Line Items]
Amount drawn down		$ 32,825
Repayment period											6 years
Number of installments											24
Frequency of payments											quarterly
Balloon installment											$ 18,723
Expiration date											Jan. 31, 2025
SEB Facility | First Two Tranches
Debt Instrument [Line Items]
Line of credit facility, description											The first two tranches were used together with cash on hand to refinance the outstanding amounts under the lease agreements of the Star Laetitia and the Star Sienna.
SEB Facility | First Two Tranches | First 10 Quarters
Debt Instrument [Line Items]
Repayment installment											$ 677
SEB Facility | First Two Tranches | Remaining 14 Quarters
Debt Instrument [Line Items]
Repayment installment											524
SEB Facility | Tranche C
Debt Instrument [Line Items]
Amount drawn down								$ 1,260
SEB Facility | Tranche D
Debt Instrument [Line Items]
Maximum borrowing capacity											1,260
Remaining borrowing capacity											$ 1,260
SEB Facility | Remaining Two Tranches
Debt Instrument [Line Items]
Number of installments											12
Frequency of payments											quarterly
Line of credit facility, description											The remaining two tranches were used to finance the acquisition and installation of scrubber equipment for the vessels Star Laetitia and Star Sienna.
E SUN Facility
Debt Instrument [Line Items]
Initiation date											Jan. 31, 2019
Maximum borrowing capacity											$ 37,100
Amount drawn down			$ 37,100
Number of installments											20
Frequency of payments											quarterly
Repayment installment											$ 618
Balloon installment											$ 24,733
Expiration date											Mar. 31, 2024
Vessels provided as collateral											The E SUN Facility is secured by a first priority mortgage on the Star Ariadne.
Line of credit facility, description											The E SUN Facility was used to refinance the outstanding amount under the lease agreement of the Star Ariadne.
Atradius Facility
Debt Instrument [Line Items]
Initiation date											Feb. 28, 2019
Maximum borrowing capacity											$ 36,645
Number of vessels financed for scrubber equipment and installation											42
Number of installments											10
Frequency of payments											semi-annual
Repayment installment											$ 3,664
Vessels provided as collateral											The Atradius Facility is secured by second-priority mortgage on 22 vessels of our fleet.
Line of credit facility, description											The Atradius Facility is to be used to finance the acquisition and installation of scrubber equipment for 42 vessels.
Atradius Facility | Three Tranches
Debt Instrument [Line Items]
Amount drawn down											$ 33,311
Atradius Facility | Last Tranche | Subsequent Event
Debt Instrument [Line Items]
Amount drawn down	$ 3,331
ING $100,600 Facility
Debt Instrument [Line Items]
Initiation date											Mar. 28, 2019
Line of Credit Facility, Increase											$ 52,800
Number of loan tranches											4
Vessels provided as collateral											The ING $100,600 Facility is secured by a first priority mortgage on the vessels Peloreus, Leviathan, Star Magnanimus and Star Allessia.
ING $100,600 Facility | Tranche A
Debt Instrument [Line Items]
Amount drawn down				$ 32,100
Repayment period											7 years
Number of installments											28
Frequency of payments											quarterly
Repayment installment											$ 535
Balloon installment											$ 17,120
ING $100,600 Facility | Tranche B
Debt Instrument [Line Items]
Amount drawn down					$ 17,400
Repayment period											7 years
Number of installments											28
Frequency of payments											quarterly
Repayment installment											$ 311
Balloon installment											$ 8,700
ING $100,600 Facility | First Two Tranches
Debt Instrument [Line Items]
Line of credit facility, description											The first two tranches were used to refinance the outstanding amounts under the lease agreements of the Star Magnanimus and the Star Alessia.
ING $100,600 Facility | Tranche C
Debt Instrument [Line Items]
Amount drawn down						$ 1,400
Number of installments											16
Frequency of payments											quarterly
Repayment installment											$ 88
ING $100,600 Facility | Tranche D
Debt Instrument [Line Items]
Amount drawn down										$ 1,400
Number of installments											16
Frequency of payments											quarterly
Repayment installment											$ 88
ING $100,600 Facility | Remaining Two Tranches
Debt Instrument [Line Items]
Line of credit facility, description											The remaining two tranches were used to finance the acquisition and installation of scrubber equipment for the vessels Star Magnanimus and the Star Alessia.
ING $47,800 Facility
Debt Instrument [Line Items]
Maximum borrowing capacity											$ 47,800
ING $47,800 Facility | Tranche A
Debt Instrument [Line Items]
Proceeds from issuance of debt									$ 22,500
Number of installments											28
Frequency of payments											quarterly
Repayment installment											$ 469
Balloon installment											$ 9,375
ING $47,800 Facility | Tranche B
Debt Instrument [Line Items]
Proceeds from issuance of debt									$ 22,500
Number of installments											28
Frequency of payments											quarterly
Repayment installment											$ 469
Balloon installment											$ 9,375
ING $47,800 Facility | First Two Tranches
Debt Instrument [Line Items]
Line of credit facility, description											The first two tranches of ING $47,800 Facility were used to refinance the outstanding amount of Deutsche Bank $85,000 Facility.
ING $47,800 Facility | Tranche C
Debt Instrument [Line Items]
Amount drawn down							$ 1,400
Number of installments											16
Frequency of payments											quarterly
Repayment installment											$ 88
ING $47,800 Facility | Tranche D
Debt Instrument [Line Items]
Amount drawn down							$ 1,400
Number of installments											16
Frequency of payments											quarterly
Repayment installment											$ 88
ING $47,800 Facility | Remaining Two Tranches
Debt Instrument [Line Items]
Line of credit facility, description											The remaining two tranches of ING $47,800 Facility were used to finance the acquisition and installation of scrubber equipment for the vessels Peloreus and Leviathan.

Long-term debt - Information _2

Long-term debt - Information Per Loan 2 (Details) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	5 Months Ended	8 Months Ended	11 Months Ended	12 Months Ended
	Feb. 06, 2020USD ($)	Feb. 29, 2020USD ($)	Mar. 23, 2020USD ($)	May 31, 2019USD ($)	Aug. 31, 2019USD ($)	Nov. 30, 2019USD ($)	Dec. 31, 2019USD ($)
Citibank $62,600 Facility
Debt Instrument [Line Items]
Initiation date							May 8, 2019
Amount drawn down				$ 62,563
Number of installments							20
Frequency of payments							quarterly
Repayment installment							$ 1,298
Balloon installment							$ 36,611
Expiration date							May 31, 2024
Vessels provided as collateral							The Citibank $62,600 Facility is secured by a first priority mortgage on the vessels Star Virgo and Star Marisa.
Line of credit facility, description							The Citibank $62,600 Facility was used together with cash on hand to refinance the outstanding amounts under the lease agreements of the Star Virgo and the Star Marisa.
CTBC Facility
Debt Instrument [Line Items]
Initiation date							May 24, 2019
Maximum borrowing capacity							$ 35,000
Amount drawn down				$ 35,000
Number of installments							20
Frequency of payments							quarterly
Repayment installment							$ 730
Balloon installment							$ 20,400
Expiration date							May 31, 2024
Vessels provided as collateral							The CTBC Facility is secured by a first priority mortgage on the vessel Star Karlie.
Line of credit facility, description							The CTBC Facility was used to refinance the outstanding amount under the lease agreement of the Star Karlie.
NTT Facility
Debt Instrument [Line Items]
Initiation date							Jul. 31, 2019
Maximum borrowing capacity							$ 17,500
Amount drawn down					$ 17,500
Number of installments							27
Frequency of payments							quarterly
Repayment installment							$ 313
Balloon installment							$ 9,063
Expiration date							Aug. 31, 2026
Vessels provided as collateral							The NTT Facility is secured by a first priority mortgage on the Star Aquarius.
Line of credit facility, description							The NTT Facility was used to refinance the outstanding loan amount of $11,161 of the Star Aquarius under the "NIBC $32,000 Facility".
NIBC $32,000 Facility
Debt Instrument [Line Items]
Repayments of debt					$ 11,161
CEXIM $106,470 Facility
Debt Instrument [Line Items]
Initiation date							Sep. 23, 2019
Maximum borrowing capacity							$ 106,470
Vessels provided as collateral							The CEXIM $106,470 Facility is secured by first priority mortgages on the vessels Katie K, Debbie H and Star Ayesha.
Line of credit facility, description							The CEXIM $106,470 Facility was used to refinance the outstanding amount under the lease agreements of the Katie K, the Debbie H and Star Ayesha.
Number of loan tranches							3
CEXIM $106,470 Facility | Tranche A
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 35,490
Amount drawn down						$ 35,490
Number of installments							40
Frequency of payments							quarterly
Repayment installment							$ 739
Balloon installment							5,915
CEXIM $106,470 Facility | Tranche B
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 35,490
Amount drawn down						35,490
Number of installments							40
Frequency of payments							quarterly
Repayment installment							$ 739
Balloon installment							5,915
CEXIM $106,470 Facility | Tranche C
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 35,490
Amount drawn down						$ 35,490
Number of installments							40
Frequency of payments							quarterly
Repayment installment							$ 739
Balloon installment							$ 5,915
HSBC Working Capital Facility | Subsequent Event
Debt Instrument [Line Items]
Initiation date	Feb. 6, 2020
Maximum borrowing capacity	$ 30,000
Amount drawn down		$ 8,834	$ 13,123
Vessels provided as collateral	The HSBC Working Capital Facility is secured by second priority mortgage on the eight vessels which secure the HSBC $80,000 Facility.
Line of credit facility, description	The HSBC Working Capital Facility will be used to finance working capital requirements.

Long-term debt - Pre-Existing L

Long-term debt - Pre-Existing Loan Facilities 1 (Details) $ in Thousands	4 Months Ended	8 Months Ended		9 Months Ended		10 Months Ended		12 Months Ended
	May 03, 2018USD ($)	Aug. 23, 2018USD ($)	Aug. 21, 2018USD ($)	Sep. 28, 2018USD ($)	Sep. 26, 2018USD ($)	Nov. 05, 2018USD ($)	Oct. 23, 2018USD ($)	Dec. 31, 2019USD ($)
NBG $30,000 Facility
Debt Instrument [Line Items]
Initiation date								Apr. 19, 2018
Maximum borrowing capacity								$ 30,000
Amount drawn down	$ 30,000
Maturity date								Feb. 28, 2023
Prepayment amount								$ 16,326
Frequency of payments								quarterly
Repayment installment								$ 359
Balloon installment								$ 4,516
Vessels provided as collateral								The NBG $30,000 Facility is secured by a first priority mortgage on the vessels Star Theta and Star Iris.
Line of credit facility, description								The NBG $30,000 Facility was used along with cash on hand to fully repay the outstanding amount of Commerzbank $120,000 Facility.
Commerzbank $120,000 Facilitiy
Debt Instrument [Line Items]
Repayments of debt	$ 34,726
Credit Agricole $43,000 Facility
Debt Instrument [Line Items]
Initiation date								Aug. 21, 2018
Maximum borrowing capacity								$ 43,000
Amount drawn down		$ 43,000
Vessels provided as collateral								The facility is secured by the vessels Star Borealis and Star Polaris.
Line of credit facility, description								The Credit Agricole $43,000 Facility was used to refinance the outstanding amount under the Credit Agricole $70,000 Facility.
Number of loan tranches								2
Credit Agricole $43,000 Facility | Tranche A
Debt Instrument [Line Items]
Amount drawn down		21,500
Number of installments								20
Frequency of payments								quarterly
Repayment installment								$ 625
Balloon installment								$ 9,000
Credit Agricole $43,000 Facility | Tranche B
Debt Instrument [Line Items]
Amount drawn down		$ 21,500
Number of installments								20
Frequency of payments								quarterly
Repayment installment								$ 625
Balloon installment								$ 9,000
Credit Agricole $70,000 Facilitiy
Debt Instrument [Line Items]
Repayments of debt			$ 44,100
HSBC $80,000 Facility
Debt Instrument [Line Items]
Initiation date								Sep. 26, 2018
Maximum borrowing capacity								$ 80,000
Amount drawn down				$ 80,000
Expiration date								Aug. 31, 2023
Prepayment amount								$ 7,505
Frequency of payments								quarterly
Repayment installment								$ 2,140
Balloon installment								$ 29,095
Vessels provided as collateral								The facility is secured by the vessels Kymopolia, Mercurial Virgo, Pendulum, Amami, Madredeus, Star Emily, Star Omicron and Star Zeta.
Line of credit facility, description								The HSBC $80,000 Facility was used to refinance the outstanding amount under the HSH Nordbank $64,500 Facility and HSBC $86,600 Facility.
HSH Nordbank $64,500 Facility and HSBC $86,600 Facility
Debt Instrument [Line Items]
Repayments of debt					$ 74,647
DNB $310,000 Facility
Debt Instrument [Line Items]
Initiation date								Sep. 27, 2018
Maximum borrowing capacity								$ 310,000
Expiration date								Sep. 30, 2023
Vessels provided as collateral								The loan is secured by a first priority mortgage on Big Bang, Strange Attractor, Big Fish, Pantagruel, Gargantua, Goliath, Maharaj, Star Poseidon, Star Nasia, Diva, Star Danai, Star Renee, Star Markella, Star Laura, Star Moira, Star Jennifer, Star Mariella, Star Helena, Star Maria, Star Sirius, Star Vega, Star Triumph, Star Charis, Star Suzanna, Star Angelina and Star Gwyneth.
Number of loan tranches								2
DNB $310,000 Facility | Tranche A
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 240,000
Amount drawn down				240,000
Number of installments								20
Frequency of payments								quarterly
Repayment installment								$ 8,696
Balloon installment								$ 66,087
Line of credit facility, description								The tranche of $240,000 was used to refinance the outstanding amount under the ABN $87,458 Facility, the DNB-SEB-CEXIM $227,500 Facility, the DNB $120,000 Facility, the Deutsche Bank AG $39,000 Facility and the ABN AMRO Bank N.V. $30,844 Facility.
DNB $310,000 Facility | Tranche B
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 70,000
Amount drawn down								$ 51,202
Number of installments								12
Frequency of payments								quarterly
Repayment installment, percentage								5.55%
Line of credit facility, description								The tranche of $70,000 was used to finance the acquisition and installation of scrubber equipment for the mortgaged vessels under the DNB $310,000 Facility.
ABN $87,458 Facility, DNB-SEB-CEXIM $227,500 Facility, DNB $120,000 Facility, Deutsche Bank AG $39,000 Facility and ABN AMRO Bank N.V $30,844 Facility
Debt Instrument [Line Items]
Repayments of debt				$ 240,440
Citi $130,000 Facility
Debt Instrument [Line Items]
Initiation date								Oct. 18, 2018
Maximum borrowing capacity								$ 130,000
Vessels provided as collateral								The Citi $130,000 Facility is secured by a first priority mortgage on the vessels Star Pauline, Star Angie, Star Sophia, Star Georgia, Star Kamila and Star Nina and five of the Augustea Vessels Star Eva, Star Paola., Star Aphrodite, Star Lydia and Star Nicole.
Line of credit facility, description								The Citi $130,000 Facility was used to refinance the outstanding amount under the Citi Facility and the existing indebtedness of five of the Augustea Vessels.
Number of loan tranches								2
Citi $130,000 Facility | Tranche A
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 65,000
Amount drawn down							$ 65,000
Number of installments								20
Frequency of payments								quarterly
Repayment installment								$ 1,825
Date of first required payment								Jan. 31, 2019
Balloon installment								$ 28,500
Citi $130,000 Facility | Tranche B
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 65,000
Amount drawn down						$ 65,000
Number of installments								20
Frequency of payments								quarterly
Repayment installment								$ 1,825
Date of first required payment								Jan. 31, 2019
Balloon installment								$ 28,500
Citi Facility
Debt Instrument [Line Items]
Repayments of debt						$ 100,075

Long-term debt - Pre-Existing_2

Long-term debt - Pre-Existing Loan Facilities 2 (Details) $ in Thousands	1 Months Ended	10 Months Ended	12 Months Ended
	Jan. 31, 2019USD ($)	Oct. 31, 2014USD ($)	Dec. 31, 2019USD ($)	Dec. 20, 2018USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
ABN $115,000 Facility
Debt Instrument [Line Items]
Initiation date			Dec. 17, 2018
Maximum borrowing capacity			$ 115,000
Vessels provided as collateral			The ABN $115,000 Facility is secured by a first priority on the four Augustea Vessels and the Step 1 Vessels.
Number of loan tranches			4
Number of vessels financed			7
ABN $115,000 Facility | Tranche A
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 69,525
Amount drawn down				$ 69,525
Number of installments			20
Frequency of payments			quarterly
Repayment installment			$ 1,705
Balloon installment			$ 35,428
Line of credit facility, description			The first tranche was used to refinance the then existing indebtedness of four of the Augustea Vessels Star Virginia, Star Scarlett, Star Jeanette and Star Audrey.
Number of vessels financed			4
ABN $115,000 Facility | Tranche B
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 7,900
Amount drawn down				$ 7,900
Number of installments			20
Frequency of payments			quarterly
Repayment installment			$ 282
Balloon installment			$ 2,260
Line of credit facility, description			The second tranche was used to partially finance the acquisition cost of the Star Bright.
ABN $115,000 Facility | Remaining Two Tranches
Debt Instrument [Line Items]
Line of credit facility, description			The remaining two tranches were used to partially finance the acquisition cost of the Star Marianne and Star Janni.
ABN $115,000 Facility | Tranche C
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 17,875
Amount drawn down	$ 17,875
Number of installments			19
Frequency of payments			quarterly
Repayment installment			$ 672
Balloon installment			5,114
ABN $115,000 Facility | Tranche D
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 17,875
Amount drawn down	$ 17,875
Number of installments			19
Frequency of payments			quarterly
Repayment installment			$ 672
Balloon installment			$ 5,114
DVB $24,750 Facility
Debt Instrument [Line Items]
Initiation date			Oct. 30, 2014
Amount drawn down		$ 24,750
Number of installments			24
Frequency of payments			quarterly
Balloon installment			$ 12,150
Expiration date			Oct. 31, 2020
Vessels provided as collateral			The DVB $24,750 Facility is secured by a first priority pledge of the membership interests of the Christine Shipco LLC.
Line of credit facility, description			The DVB $24,750 Facility was used to partially finance the acquisition of 100% of the equity interests of Christine Shipco LLC, which is the owner of the vessel Star Martha.
DVB $24,750 Facility | Christine Shipco LLC
Debt Instrument [Line Items]
Percentage of equity interest acquired		100.00%
DVB $24,750 Facility | First Four Installments
Debt Instrument [Line Items]
Repayment installment			$ 900
DVB $24,750 Facility | Last Twenty Installments
Debt Instrument [Line Items]
Repayment installment			$ 450
Sinosure Facility
Debt Instrument [Line Items]
Initiation date			Feb. 11, 2015
Maximum borrowing capacity			$ 98,165
Repayment period			12 years
Number of installments			48
Frequency of payments			quarterly
Vessels provided as collateral			The Sinosure Facility is secured by a first priority cross collateralized mortgage over the Sinosure Financed Vessels.
Line of credit facility, description			The Sinosure Facility was used to partially finance the construction cost of the newbuilding vessels, Honey Badger, Wolverine, Star Antares, Star Lutas, Kennadi and Mackenzie (the “Sinosure Financed Vessels”).
Number of loan tranches			6
Honey Badger
Debt Instrument [Line Items]
Delivery Date			February 27, 2015
Wolverine
Debt Instrument [Line Items]
Delivery Date			February 27, 2015
Star Antares
Debt Instrument [Line Items]
Delivery Date			October 9, 2015
Star Lutas
Debt Instrument [Line Items]
Delivery Date			January 6, 2016
Kennadi
Debt Instrument [Line Items]
Delivery Date			January 8, 2016
Mackenzie
Debt Instrument [Line Items]
Delivery Date			March 2, 2016
8.30% 2022 Notes
Debt Instrument [Line Items]
Issuance date			Nov. 9, 2017
Face amount			$ 50,000
Maturity date			Nov. 15, 2022
Interest rate			8.30%
Frequency of payments			quarterly in arrears on the 15th day of February, May, August and November
Date of first required payment			Feb. 15, 2018
Redemption price percentage			100.00%
Redemption description			The Company may redeem the 2022 Notes in whole, but not in part, at any time at its option, at a redemption price equal to 100% of the principal amount to be redeemed, plus accrued and unpaid interest.
Unamortized debt issuance costs			$ 1,179		$ 1,590
8.00% 2019 Notes
Debt Instrument [Line Items]
Interest rate			8.00%
Repurchased face amount						$ 50,000

Long-term Debt - Assumed debt a

Long-term Debt - Assumed debt as part of the acquisition of Augustea Vessels (Details) $ in Thousands	7 Months Ended	12 Months Ended
	Aug. 03, 2018USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Credit Suisse
Debt Instrument [Line Items]
Number of vessels financed		5
Repayments of debt			$ 60,790
ABN AMRO
Debt Instrument [Line Items]
Number of vessels financed		4
Repayments of debt			$ 69,907
BNP Facility
Debt Instrument [Line Items]
Vessels provided as collateral		The loan is secured by a first priority mortgage on the two Augustea vessels.
Line of credit facility, description		The BNP Facility provided financing for the vessels Star Despoina and Pierra.
Number of loan tranches		2
Number of vessels financed		2
BNP Facility | Tranche A
Debt Instrument [Line Items]
Outstanding amount	$ 15,914
Number of installments	16
Frequency of payments		quarterly
BNP Facility | Tranche B
Debt Instrument [Line Items]
Outstanding amount	$ 14,977
Number of installments	17
Frequency of payments		quarterly
BNP Facility | Tranche A - First Fifteen Installments
Debt Instrument [Line Items]
Repayment installment		$ 500
BNP Facility | Tranche A - Sixteenth Installment
Debt Instrument [Line Items]
Repayment installment		8,414
BNP Facility | Tranche B - First Sixteen Installments
Debt Instrument [Line Items]
Repayment installment		500
BNP Facility | Tranche B - Seventeenth Installment
Debt Instrument [Line Items]
Repayment installment		$ 6,977
Bank of Tokyo Facility
Debt Instrument [Line Items]
Outstanding amount	$ 16,000
Number of installments		17
Frequency of payments		quarterly
Vessels provided as collateral		The loan is secured by a first priority mortgage on the Star Monica.
Line of credit facility, description		The Bank of Tokyo Facility provided financing for the vessel Star Monica.
Bank of Tokyo Facility | First Sixteen Installments
Debt Instrument [Line Items]
Repayment installment		$ 346
Bank of Tokyo Facility | Seventeenth Installment
Debt Instrument [Line Items]
Repayment installment		10,464
Augustea Vessels
Debt Instrument [Line Items]
Debt assumed	$ 308,279
Star Sienna, Star Laetitia, ABOY Karlie and Star Alessia
Debt Instrument [Line Items]
Capital lease obligations recognised		$ 127,101

Long-term debt - Scrubber Finan

Long-term debt - Scrubber Financing (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Atradius Facility
Debt Instrument [Line Items]
Number of vessels financed for scrubber equipment and installation	42
Songa Vessels
Debt Instrument [Line Items]
Number of vessels financed for scrubber equipment and installation	10
Scrubber equipment
Debt Instrument [Line Items]
Remaining borrowing capacity	$ 46,227
Scrubber equipment | Atradius Facility
Debt Instrument [Line Items]
Amount drawn down	33,311
Scrubber equipment | DNB $310,000 Facility
Debt Instrument [Line Items]
Amount drawn down	51,202
Scrubber equipment | SEB Facility
Debt Instrument [Line Items]
Amount drawn down	1,260
Scrubber equipment | ING $100,600 Facility
Debt Instrument [Line Items]
Amount drawn down	5,600
Scrubber equipment | CMBL
Debt Instrument [Line Items]
Amount drawn down	$ 12,165

Long-term debt - Additional Inf

Long-term debt - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jul. 31, 2018	May 31, 2018	Feb. 28, 2018	Sep. 30, 2016
Debt Instrument [Line Items]
Loan reference interest rate	LIBOR
Cash and cash equivalents	$ 117,819	$ 204,921	$ 257,911
Restricted cash	$ 7,422	$ 6,435	$ 7,169
Weighted average interest rate	5.28%	5.59%	4.72%
Unused credit facilities, commitment fee	$ 806	$ 1,049	$ 6
Write off of unamortized issuance costs	3,526	2,383	1,257
Prepayment fees incurred	2,297
Write off of unamortized issuance costs excluding prepayment fees incurred
Debt Instrument [Line Items]
Write off of unamortized issuance costs	1,229
Restructuring Letter Agreements
Debt Instrument [Line Items]
Prepayment amount			$ 9,768	$ 22,723	$ 30,000	$ 35,632
Amount of equity to be raised under debt instrument covenants							$ 50,000
Legally restricted
Debt Instrument [Line Items]
Restricted cash	8,443	8,956
Not legally restricted
Debt Instrument [Line Items]
Cash and cash equivalents	$ 58,000	$ 53,500

Long-term debt - Terms and Cove

Long-term debt - Terms and Covenants (Details)	12 Months Ended
	Dec. 31, 2019
Line of Credit Facility [Line Items]
Line of Credit Facility, Covenant Terms	The Company's outstanding credit facilities and senior notes generally contain customary affirmative and negative covenants, on a subsidiary level, including limitations to: - pay dividends if there is an event of default under the Company's credit facilities; - incur additional indebtedness, including the issuance of guarantees, refinance or prepay any indebtedness, unless certain conditions exist; - create liens on Company's assets, unless otherwise permitted under Company's credit facilities; - change the flag, class or management of Company's vessels or terminate or materially amend the management agreement relating to each vessel; - acquire new or sell vessels, unless certain conditions exist; - merge or consolidate with, or transfer all or substantially all Company's assets to, another person; or - enter into a new line of business. Furthermore, the Company's credit facilities and senior notes contain financial covenants requiring the Company to maintain various financial ratios, including: - a minimum percentage of aggregate vessel value to secured loans (security cover ratio or ''SCR''); - a maximum ratio of total liabilities to market value adjusted total assets; - a minimum EBITDA to interest coverage ratio; - a minimum liquidity; and - a minimum market value adjusted net worth. As of December 31, 2018 and 2019, the Company was required to maintain minimum liquidity, not legally restricted, of $53,500 and $58,000, respectively, which is included within ''Cash and cash equivalents'' in the balance sheets. In addition, as of December 31, 2018 and 2019, the Company was required to maintain minimum liquidity, legally restricted, of $8,956 and $8,443, respectively, which is included within ''Restricted cash'' current and non-current, in the consolidated balance sheets.
Debt Instrument, Covenant Compliance	As of December 31, 2019, the Company was in compliance with the applicable financial and other covenants contained in its debt agreements, including the 2022 Notes.

Preferred, Common Shares and Ad

Preferred, Common Shares and Additional Paid in Capital - Equity (Details) - USD ($) $ / shares in Units, $ in Thousands

Jan. 14, 2019

Jan. 03, 2019

Feb. 02, 2017

Jun. 29, 2018

Oct. 31, 2018

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2017

Nov. 20, 2019

Nov. 29, 2018

Oct. 10, 2018

Aug. 03, 2018

Jul. 06, 2018

Class of Stock [Line Items]

Offering expenses

$ 2,032

Purchase of treasury stock

$ 20,430

$ 3,145

Dividends per share

$ 0.05

Dividends paid

$ 4,804

Preferred Shares

Class of Stock [Line Items]

Preferred Shares - Shares Authorized

25,000,000

25,000,000

Preferred Shares - Par Value

$ 0.01

$ 0.01

Preferred Shares - Shares Issued

0

0

Common Shares

Class of Stock [Line Items]

Common Shares - Shares Authorized

300,000,000

300,000,000

Common Shares - Par Value

$ 0.01

$ 0.01

Stock issued during period, share based compensation

883,700

868,975

1,220,825

Common shares issued

6,310,272

Purchase of treasury stock

$ 29

Shares cancelled

2,940,558

Share Repurchase Program

Class of Stock [Line Items]

Stock repurchase program, authorized amount

$ 50,000

Share Repurchase Program | Open Market Transactions

Class of Stock [Line Items]

Common shares repurchased

1,579,195

341,363

Common shares repurchased, Average price per Share

$ 7.49

$ 9.17

Purchase of treasury stock

$ 11,831

$ 3,131

Shares cancelled

341,363

1,579,195

Share Repurchase Program | Private Transaction

Class of Stock [Line Items]

Common shares repurchased

1,020,000

Common shares repurchased, Average price per Share

$ 8.40

Purchase of treasury stock

$ 8,600

Shares cancelled

1,020,000

Private placement

Class of Stock [Line Items]

Common shares issued

6,310,272

Price per share

$ 8.154

Proceeds from issuance of private placement

$ 50,427

Private placement | Oaktree and its affiliates

Class of Stock [Line Items]

Common shares issued

3,244,292

Secondary offering

Class of Stock [Line Items]

Offering expenses

$ 2,032

Secondary offering | Oaktree Capital Management L.P.

Class of Stock [Line Items]

Common shares issued

5,000,000

Price per share

$ 13.10

OCC vessels | Common Shares

Class of Stock [Line Items]

Shares to acquire vessels

3,304,735

Songa Vessels

Class of Stock [Line Items]

Price per share

$ 13.31

Songa Vessels | Common Shares

Class of Stock [Line Items]

Shares to acquire vessels

13,725,000

Augustea Vessels

Class of Stock [Line Items]

Price per share

$ 14

Augustea Vessels | Common Shares

Class of Stock [Line Items]

Shares to acquire vessels

10,277,335

Shares cancelled

53,978

Augustea Vessels | Common Shares | Initially Issued

Class of Stock [Line Items]

Shares to acquire vessels

10,331,313

Star Bright | Common Shares

Class of Stock [Line Items]

Shares to acquire vessels

291,300

Star Bright | Step 1 Vessels

Class of Stock [Line Items]

Price per share

$ 13.87

Star Marianne and Star Janni | Step 1 Vessels

Class of Stock [Line Items]

Shares to acquire vessels

999,336

Delphin Vessels | Common Shares

Class of Stock [Line Items]

Shares to acquire vessels

4,503,370

Other operational gain (Details

Other operational gain (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Gain Contingencies [Line Items]
Other operational gain	$ 2,423	$ 0	$ 2,918
Gain/ (Loss) Related to Litigation Settlement			$ 2,139

Management fees (Details)

Management fees (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property Management Fee [Abstract]
Management fees	$ 17,500	$ 11,321	$ 7,543

Equity Incentive Plans - Summar

Equity Incentive Plans - Summary of non-vested restricted shares (Table) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of shares
Unvested at beginning of period	143,000	280,000	385,000
Granted	885,000	672,500	944,000
Vested	(756,962)	(809,500)	(1,049,000)
Unvested at end of period	271,038	143,000	280,000
Weighted Average Grant Date Fair Value
Unvested at beginning of period	$ 12.49	$ 8.09	$ 4.82
Granted	8.13	11.68	9.59
Vested	8.54	10.29	8.24
Unvested at end of period	$ 9.28	$ 12.49	$ 8.09

Equity Incentive Plans - Summ_2

Equity Incentive Plans - Summary of non-vested share options (Table) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of options
Outstanding at beginning of period	104,250	104,250	104,250
Granted	0	0	0
Vested	0	0	0
Outstanding at end of period	104,250	104,250	104,250
Weighted average exercise price
Outstanding at beginning of period	$ 27.5	$ 27.5	$ 27.5
Granted	0	0	0
Vested	0	0	0
Outstanding at end of period	27.5	27.5	27.5
Weighted Average Grant Date Fair Value
Outstanding at beginning of period	7.0605	7.0605	7.0605
Granted	0	0	0
Vested	0	0	0
Outstanding at end of period	$ 7.0605	$ 7.0605	$ 7.0605

Equity Incentive Plans - Compan

Equity Incentive Plans - Company's Equity Incentive Plans (Details) $ / shares in Units, $ in Thousands

Jan. 07, 2019shares

Feb. 27, 2019shares

Feb. 27, 2018shares

Feb. 22, 2017shares

Apr. 09, 2018shares

Apr. 13, 2015$ / sharesshares

May 22, 2019shares

Aug. 31, 2019shares

Aug. 27, 2018shares

Aug. 22, 2018shares

Aug. 22, 2017shares

Dec. 31, 2019USD ($)shares

Dec. 31, 2018USD ($)shares

Dec. 31, 2017USD ($)shares

Dec. 31, 2016shares

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of shares granted

885,000

672,500

944,000

Number of shares vested during the period

756,962

809,500

1,049,000

Dividends on non-vested shares | $

$ 14

$ 0

$ 0

Share based compensation | $

$ 7,943

$ 8,072

$ 9,267

Number of options granted

0

0

0

Total unrecognised compensation cost relating to non-vested share option | $

$ 42

Total unrecognised compensation cost relating to restricted share awards | $

$ 4,347

Weighted average remaining term for non-vested share option awards

2 years 1 month 13 days

Weighted average remaining term for non-vested restricted share awards

3 months 18 days

Total fair value of shares vested during the period | $

$ 7,703

$ 10,745

$ 12,023

Number of shares unvested

271,038

143,000

280,000

385,000

Employee Stock Option

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of options granted

104,250

Option exercise price | $ / shares

$ 27.5

Fair value assumptions - Expected term

5 years

Fair value assumptions - Expected volatility rate

59.274%

Fair value assumptions - Risk free interest rate

1.30%

Restricted Share Units (RSUs)

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Total shares authorized

4,000,000

Vesting rights

Each RSU represents, upon vesting, a right for the beneficiary to receive one common share of the Company.

Number of tranches

10

Restricted common shares expected to vest

400,000

Restricted Share Units (RSUs) | Tranche One

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting date

Apr. 30, 2021

Shares expected to vest

2,000,000

Restricted Share Units (RSUs) | Tranche Two

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting date

Apr. 30, 2022

Shares expected to vest

2,000,000

Restricted common shares expected to vest

400,000

Amortization expense for RSUs expected to vest | $

$ 1,235

Restricted Share Units (RSUs) | Minimum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Fleet performance indices | $

120,000

Restricted Share Units (RSUs) | Maximum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Fleet performance indices | $

$ 300,000

Employees

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of shares granted

276,000

Number of shares vested during the period

276,000

Equity Incentive Plan 2017

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares reserved for issuance

950,000

Number of shares granted

944,000

Number of shares vested during the period

200,000

744,000

Equity Incentive Plan 2018

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares reserved for issuance

700,000

Number of shares granted

396,500

Number of shares vested during the period

71,500

253,500

Equity Incentive Plan 2018 | Vest in February 2021

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Vesting date

Feb. 27, 2021

Number of shares unvested

71,500

Equity Incentive Plan 2019

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Shares reserved for issuance

900,000

Number of shares granted

885,000

Number of shares vested during the period

685,462

Equity Incentive Plan 2019 | Vest in August 2020

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Restricted common shares expected to vest

99,769

Equity Incentive Plan 2019 | Vest in August 2022

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Restricted common shares expected to vest

99,769

Earnings _ (Loss) per Share (Ta

Earnings / (Loss) per Share (Table) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Income (Loss) Attributable to Parent [Abstract]
Net income / (loss)	$ (16,201)	$ 58,397	$ (9,771)
Basic earnings / (loss) per share:
Weighted average common shares outstanding, basic	93,735,549	77,061,227	63,034,394
Basic earnings / (loss) per share	$ (0.17)	$ 0.76	$ (0.16)
Effect of dilutive securities:
Dilutive effect of non vested shares	0	264,884	0
Weighted average common shares outstanding, diluted	93,735,549	77,326,111	63,034,394
Diluted earnings / (loss) per share	$ (0.17)	$ 0.76	$ (0.16)

Earnings _ (Loss) per Share (De

Earnings / (Loss) per Share (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings / (loss) per share
Number of anti-dilutive shares	271,038	0	280,000
Employee Stock Option
Earnings / (loss) per share
Number of anti-dilutive shares	104,250	104,250	104,250

Accrued Liabilities (Table) (De

Accrued Liabilities (Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accrued Liabilities, Current [Abstract]
Audit fees	$ 232	$ 295
Legal fees	40	34
Other professional fees	1,540	1,502
Vessel Operating and voyage expenses	37,555	6,514
Loan interest and financing fees	7,394	8,277
Income tax	0	232
Total Accrued Liabilities	$ 46,761	$ 16,854

Income taxes (Details)

Income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tonnage taxes	$ 2,087	$ 1,506	$ 2,565
Income tax	109	61	236
US Source Income
Income tax			202
Maltese and Swiss Registered Companies
Income tax	$ 109	$ 61	$ 34

Commitments and Contingencies -

Commitments and Contingencies - Contractual Obligations (Table) (Details) $ in Thousands	Dec. 31, 2019USD ($)
Other Commitments [Line Items]
2020	$ (37,506)
2021	(329)
2022	(314)
2023	(210)
2024	(43)
2025 and thereafter	0
Total	(38,402)
Future, minimum, non-cancellable charter revenue (1)
Other Commitments [Line Items]
2020	15,349
2021	0
2022	0
2023	0
2024	0
2025 and thereafter	0
Total	15,349
Future, minimum, charter-in hire payments (2)
Other Commitments [Line Items]
2020	(3,894)
2021	0
2022	0
2023	0
2024	0
2025 and thereafter	0
Total	(3,894)
Vessel scrubbers (3)
Other Commitments [Line Items]
2020	(48,634)
2021	0
2022	0
2023	0
2024	0
2025 and thereafter	0
Total	(48,634)
Office rent
Other Commitments [Line Items]
2020	(327)
2021	(329)
2022	(314)
2023	(210)
2024	(43)
2025 and thereafter	0
Total	$ (1,223)

Commitments and Contingencies_2

Commitments and Contingencies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Loss Contingencies [Line Items]
Coverage for pollution	$ 1,000,000
Future, minimum, non-cancellable charter revenue (1)
Loss Contingencies [Line Items]
Minimum contractual charter revenues	15,349
Future, minimum, charter-in hire payments (2)
Loss Contingencies [Line Items]
Office rent	3,894
Vessel scrubbers (3)
Loss Contingencies [Line Items]
Secured financing related to commitments payments	149,765
Remaining borrowing capacity	$ 46,227

Voyage revenues (Table) (Detail

Voyage revenues (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Voyage revenues	$ 821,365	$ 651,561	$ 331,976
Time charters
Revenues from External Customers and Long-Lived Assets [Line Items]
Voyage revenues	373,927	397,499	240,529
Voyage charters
Revenues from External Customers and Long-Lived Assets [Line Items]
Voyage revenues	437,779	253,812	102,977
Pool revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Voyage revenues	$ 9,659	$ 250	574
Including address commissions
Revenues from External Customers and Long-Lived Assets [Line Items]
Voyage revenues			$ 344,080

Voyage revenues (Details)

Voyage revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Voyage revenues	$ 821,365	$ 651,561	$ 331,976
Increase/ (Decrease) in trade accounts receivable	20,383	22,266	5,949
Increase/ (Decrease) in deferred revenue	(3,481)	2,489	5,169
Increase/ (Decrease) in deferred assets	14,940	7,545	43
Other current assets	11,413	7,046
Deferred revenue	7,374	10,855
Address commissions
Voyage revenues			$ 12,104
Revenue contracts
Increase/ (Decrease) in deferred assets	805
Other current assets	$ 2,859	$ 2,054

Voyage and Vessel operating e_3

Voyage and Vessel operating expenses - Voyage expenses (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Expenses
Port charges	$ 63,576	$ 37,215	$ 21,060
Bunkers	146,089	72,287	34,997
Commissions - third parties	6,828	6,179	3,438
Commissions - related parties (Note 3)	3,850	3,400	3,300
Miscellaneous	2,619	2,515	1,887
Total voyage expenses	$ 222,962	$ 121,596	$ 64,682

Voyage and Vessel operating e_4

Voyage and Vessel operating expenses - Vessel operating expenses (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Expenses
Crew wages and related costs	$ 103,701	$ 80,360	$ 63,074
Insurances	10,311	7,544	6,314
Maintenance, repairs, spares and stores	25,675	26,368	18,589
Lubricants	9,833	8,494	7,016
Tonnage taxes	2,087	1,506	2,565
Pre-delivery and Pre-joining expenses	1,507	1,234	1,925
Miscellaneous	6,948	3,366	1,945
Total vessel operating expenses	$ 160,062	$ 128,872	$ 101,428

Fair Value Measurements and H_3

Fair Value Measurements and Hedging - Consolidated Statement of Operations (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Gain/(loss) on derivative financial instruments, net
Unrealized gain/(loss) after de-designation of accounting hedging relationship (April 1, 2015)	$ 0	$ 140	$ 2,802
Realized gain/(loss) after de-designation of accounting hedging relationship (April 1, 2015)	0	(141)	(2,556)
Write-off of unrealized losses related to forecasted transactions which are no longer considered probable reclassified from other comprehensive income/(loss)	0	708	0
Total Gain/(loss) on derivative financial instruments, net	0	707	246
Interest and finance costs
Reclassification adjustments of interest rate swap loss/(gain) transferred to Interest and finance costs from Other comprehensive income/(loss) (Note 9)	0	3	(852)
Total Gain/(loss) recognized	0	3	(852)
Gain/(loss) on forward freight agreements and bunker swaps
Total Gain/(loss) recognized	4,411	(447)	(841)
Forward freight agreements
Gain/(loss) on forward freight agreements and bunker swaps
Realized gain/(loss) on forward freight agreements	6,043	(599)	(877)
Unrealized gain/(loss) on forward freight agreements	(321)	520	(24)
Bunker swaps
Gain/(loss) on forward freight agreements and bunker swaps
Realized gain/(loss) on bunker swaps	(1,386)	1,491	0
Unrealized gain/(loss) on bunker swaps	75	(1,859)	60
Gain/(loss) recognized for forward freight agreements and bunker swaps
Gain/(loss) on forward freight agreements and bunker swaps
Total Gain/(loss) recognized	$ 4,411	$ (447)	$ (841)

Fair Value Measurements and H_4

Fair Value Measurements and Hedging - Fair value on a recurring basis - Quoted Prices in Active Markets (Table) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
ASSETS
asset position	$ 216	$ 537
Quoted Prices in Active Markets for Identical Assets (Level 1) | Not designated as cash flow hedges
ASSETS
Total	216	537
LIABILITIES
Total	1,724	1,799
Quoted Prices in Active Markets for Identical Assets (Level 1) | Designated as cash flow hedges
ASSETS
Total	0	0
LIABILITIES
Total	0	0
Forward freight agreements | Quoted Prices in Active Markets for Identical Assets (Level 1) | Not designated as cash flow hedges
ASSETS
asset position	216	537
Forward freight agreements | Quoted Prices in Active Markets for Identical Assets (Level 1) | Designated as cash flow hedges
ASSETS
asset position	0	0
Bunker swaps | Quoted Prices in Active Markets for Identical Assets (Level 1) | Not designated as cash flow hedges
LIABILITIES
liability position	1,724	1,799
Bunker swaps | Quoted Prices in Active Markets for Identical Assets (Level 1) | Designated as cash flow hedges
LIABILITIES
liability position	$ 0	$ 0

Fair Value Measurements and H_5

Fair Value Measurements and Hedging - Fair value on a nonrecurring basis (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment loss	$ 3,411	$ 17,784	$ 0
Fair Value Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment loss	3,411	17,784
Fair Value Measurements, Nonrecurring | Vessels, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment loss	3,411	16,178
Fair Value Measurements, Nonrecurring | Held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment loss		1,606
Fair Value Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, plant and equipment, Fair value	24,475	20,842
Fair Value Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Vessels, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, plant and equipment, Fair value	$ 24,475	14,893
Fair Value Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, plant and equipment, Fair value		$ 5,949

Fair Value Measurements and H_6

Fair Value Measurements and Hedging - Additional Information (Details) € in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2018EUR (€)	Dec. 31, 2017USD ($)	Apr. 30, 2018EUR (€)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Symbol		SBLK
Amount of cash held	$ 204,921	$ 117,819	$ 204,921		$ 257,911
Foreign exchange gain/ (loss)			(3,159)
Fair value hedge gain/ (loss)		0	1,609		0
Impairment loss		$ 3,411	17,784		$ 0
Bunker swaps | ING Bank N.V.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Metric Tons		84,000
Percentage of estimated annual fuel consumption		10.00%
Fixed bunker spread price		$ 266
Derivative, Description of Hedged Item		In December 2019, the Company also entered into a bunker swap with ING Bank N.V. to hedge 84,000 metric tons or approximately 10% of its estimated annual fuel consumption by selling the 2020 Singapore spread between Very Low-Sulfur Fuel Oil (VLSFO) – High-Sulfur Fuel Oil (HSFO) at $266 per ton. The effective date of the swap is January 1, 2020 and the maturity date is December 31, 2020.
Inception date		Jan. 1, 2020
Maturity date		Dec. 31, 2020
8.30% 2022 Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Symbol		SBLKZ
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
2022 Notes fair value	49,800	$ 51,360	49,800
Fair value hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amount of cash held | €						€ 70,800
Fair value hedge gain/ (loss)	$ 1,609
Ineffective portion of fair value hedge			$ 39
Payments for vessels upgrade | €				€ 20,500
Fair value hedging | Fixed orders
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amount of cash held | €						€ 20,500
Percentage of coverage through foreign currency hedging						100.00%
Fair value hedging | Optional orders
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of coverage through foreign currency hedging						50.00%

Subsequent Events (Table) (Deta

Subsequent Events (Table) (Details) - Subsequent Event $ in Thousands	3 Months Ended
	Mar. 31, 2020USD ($)
ING
Subsequent Event [Line Items]
Inception	Mar. 29, 2020
Expiry	Mar. 29, 2026
Fixed Rate	0.70%
Average Annual amortization	$ 1,200
ING | Maximum
Subsequent Event [Line Items]
Amortizing Notional amount	29,960
ING | Minimum
Subsequent Event [Line Items]
Amortizing Notional amount	$ 17,650
DNB
Subsequent Event [Line Items]
Inception	Mar. 30, 2020
Expiry	Sep. 28, 2023
Fixed Rate	0.64%
Average Annual amortization	$ 6,000
DNB | Maximum
Subsequent Event [Line Items]
Amortizing Notional amount	128,910
DNB | Minimum
Subsequent Event [Line Items]
Amortizing Notional amount	$ 51,020
SEB
Subsequent Event [Line Items]
Inception	Mar. 30, 2020
Expiry	Sep. 28, 2023
Fixed Rate	0.63%
Average Annual amortization	$ 2,400
SEB | Maximum
Subsequent Event [Line Items]
Amortizing Notional amount	51,570
SEB | Minimum
Subsequent Event [Line Items]
Amortizing Notional amount	$ 20,410
ING
Subsequent Event [Line Items]
Inception	Apr. 2, 2020
Expiry	Oct. 2, 2025
Fixed Rate	0.70%
Average Annual amortization	$ 1,900
ING | Maximum
Subsequent Event [Line Items]
Amortizing Notional amount	19,690
ING | Minimum
Subsequent Event [Line Items]
Amortizing Notional amount	$ 9,840
ING
Subsequent Event [Line Items]
Inception	Apr. 2, 2020
Expiry	Oct. 2, 2025
Fixed Rate	0.70%
Average Annual amortization	$ 1,900
ING | Maximum
Subsequent Event [Line Items]
Amortizing Notional amount	19,690
ING | Minimum
Subsequent Event [Line Items]
Amortizing Notional amount	$ 9,840
ING
Subsequent Event [Line Items]
Inception	Apr. 3, 2020
Expiry	Apr. 3, 2023
Fixed Rate	0.68%
Average Annual amortization	$ 300
ING | Maximum
Subsequent Event [Line Items]
Amortizing Notional amount	16,160
ING | Minimum
Subsequent Event [Line Items]
Amortizing Notional amount	$ 12,740
SEB
Subsequent Event [Line Items]
Inception	Apr. 30, 2020
Expiry	Jan. 30, 2025
Fixed Rate	0.73%
Average Annual amortization	$ 2,700
SEB | Maximum
Subsequent Event [Line Items]
Amortizing Notional amount	29,440
SEB | Minimum
Subsequent Event [Line Items]
Amortizing Notional amount	$ 19,250
SEB
Subsequent Event [Line Items]
Inception	Apr. 30, 2020
Expiry	Jan. 30, 2025
Fixed Rate	0.73%
Average Annual amortization	$ 2,700
SEB | Maximum
Subsequent Event [Line Items]
Amortizing Notional amount	29,440
SEB | Minimum
Subsequent Event [Line Items]
Amortizing Notional amount	$ 19,250

Subsequent Events (Details)

Subsequent Events (Details) $ / shares in Units, $ in Thousands	1 Months Ended		2 Months Ended	3 Months Ended		12 Months Ended
	Feb. 06, 2020USD ($)	Jan. 31, 2020USD ($)	Feb. 29, 2020USD ($)	Mar. 27, 2020USD ($)	Mar. 23, 2020USD ($)	Dec. 31, 2019$ / shares	Mar. 30, 2020USD ($)	Nov. 20, 2019$ / shares
Subsequent Event [Line Items]
Dividends per share | $ / shares								$ 0.05
Quarterly Dividend Declared
Subsequent Event [Line Items]
Dividends Payable, Date Declared						Feb. 19, 2020
Dividends per share | $ / shares						$ 0.05
Dividends Payable, Date of Payment						Mar. 12, 2020
Dividends Payable, Date of Record						Mar. 2, 2020
Ex-dividend date						Feb. 28, 2020
DSF $55.0 million Facility | Subsequent Event
Subsequent Event [Line Items]
Initiation date		Jan. 31, 2020
Maximum borrowing capacity		$ 55,000
Number of loan tranches		2
Vessels provided as collateral		The DSF $55.0 million Facility will be secured by first priority mortgages on the vessels Star Eleni and Star Leo.
Line of credit facility, description		The DSF $55.0 million Facility will be used to refinance the outstanding amounts under the lease agreements of Star Eleni and Star Leo.
DSF $55.0 million Facility | Tranche A | Subsequent Event
Subsequent Event [Line Items]
Maximum borrowing capacity		$ 27,500
Amount to be drawn down							$ 27,500
Repayment period		5 years
DSF $55.0 million Facility | Tranche B | Subsequent Event
Subsequent Event [Line Items]
Maximum borrowing capacity		$ 27,500
Amount to be drawn down							27,500
Repayment period		5 years
HSBC Working Capital Facility | Subsequent Event
Subsequent Event [Line Items]
Initiation date	Feb. 6, 2020
Maximum borrowing capacity	$ 30,000
Amount drawn down			$ 8,834		$ 13,123
Amount to be drawn down							$ 2,225
Vessels provided as collateral	The HSBC Working Capital Facility is secured by second priority mortgage on the eight vessels which secure the HSBC $80,000 Facility.
Line of credit facility, description	The HSBC Working Capital Facility will be used to finance working capital requirements.
Bunker swaps | ING Bank N.V. and Intercontinental Exchange Inc | Subsequent Event
Subsequent Event [Line Items]
Metric Tons				70,000
Fixed bunker spread price				$ 146
Metric Tons per month				7,000
Derivative, Description of Hedged Item				In 2020 the Company entered into bunker swaps with ING Bank N.V. and Intercontinental Exchange, Inc (“ICE”) to hedge in aggregate 70,000 metric tons of its estimated fuel consumption by selling the Singapore spread between VLSFO – HSFO at an average price of $146 per ton for the period from March to December 2020 (7,000 metric tons per month). The effective date of these swaps is March 1, 2020 and the maturity date is December 31, 2020.
Inception date				Mar. 1, 2020
Maturity date				Dec. 31, 2020
Bunker swaps | ING Bank N.V. | Subsequent Event
Subsequent Event [Line Items]
Metric Tons				24,000
Fixed bunker spread price				$ 106
Metric Tons per month				2,000
Derivative, Description of Hedged Item				In addition, in 2020 the Company entered into a bunker swap with ING Bank N.V. to hedge in aggregate 24,000 metric tons of its estimated fuel consumption by selling the Singapore spread between VLSFO – HSFO at an average price of $106 per ton for the period from January to December 2021 (2,000 metric tons per month). The effective date of these swaps is January 1, 2021 and the maturity date is December 31, 2021.
Inception date				Jan. 1, 2021
Maturity date				Dec. 31, 2021