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Unaudited Interim Condensed Consolidated Statements of Stockholders’ Equity - USD ($) $ in Thousands | Common Stock [Member] | Common Stock [Member] E.R. Vessels [Member] | Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member] E.R. Vessels [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Treasury Stock [Member] Songa Vessels [Member] | Total | Songa Vessels [Member] | E.R. Vessels [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance, value at Dec. 31, 2018 | $ 926 |  | $ 2,502,429 |  | $ 0 | $ (980,165) | $ (3,145) |  | $ 1,520,045 |  |
Beginning balance, shares at Dec. 31, 2018 | 92,627,349 |  |  |  |  |  |  |  |  |  |
Net income / (loss) | $ 0 |  | 0 |  | 0 | (45,515) | 0 |  | (45,515) |  |
Other comprehensive income / (loss) |  |  |  |  |  |  |  |  | 0 |  |
Amortization of share-based compensation (Note 11) | 0 |  | 2,857 |  | 0 | 0 | 0 |  | 2,857 |  |
Acquisition of vessels, value |  |  |  |  |  |  |  | $ (93) |  | $ (93) |
Acquisition of vessels, shares |  | 999,336 |  |  |  |  |  |  |  |  |
Acquisition of vessels, value |  | $ 10 |  | $ 10,053 |  |  |  |  |  |  | $ 10,063
Purchase and cancellation of treasury stock | $ (19) |  | (14,593) |  | 0 | 0 | 3,145 |  | (11,467) |  |
Purchase and cancellation of treasury stock, shares | (1,876,685) |  |  |  |  |  |  |  |  |  |
Ending balance, value at Jun. 30, 2019 | $ 917 |  | 2,500,746 |  | 0 | (1,025,680) | (93) |  | 1,475,890 |  |
Ending balance, shares at Jun. 30, 2019 | 91,750,000 |  |  |  |  |  |  |  |  |  |
Beginning balance, value at Dec. 31, 2019 | $ 961 |  | 2,544,342 |  | 0 | (1,001,170) | (93) |  | 1,544,040 |  |
Beginning balance, shares at Dec. 31, 2019 | 96,073,197 |  |  |  |  |  |  |  |  |  |
Net income / (loss) | $ 0 |  | 0 |  | 0 | (41,365) | 0 |  | (41,365) |  |
Other comprehensive income / (loss) | $ 0 |  | 0 |  | (5,284) | 0 | 0 |  | (5,284) |  |
Issuance of vested and non-vested shares and amortization of share-based compensation (Notes 9 and 11), shares | 1,300 |  |  |  |  |  |  |  |  |  |
Issuance of vested and non-vested shares and amortization of share-based compensation (Notes 9 and 11), value |  |  | 1,216 |  |  |  |  |  | 1,216 |  |
Dividend declared and paid ($0.05 per share) (Note 9) | $ 0 |  | 0 |  | 0 | (4,804) | 0 |  | (4,804) |  |
Ending balance, value at Jun. 30, 2020 | $ 961 |  | $ 2,545,558 |  | $ (5,284) | $ (1,047,339) | $ (93) |  | $ 1,493,803 |  |
Ending balance, shares at Jun. 30, 2020 | 96,074,497 |  |  |  |  |  |  |  |  |  |

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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration