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Unaudited Interim Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Common Shares | Common Shares OCC vessels | Common Shares E.R Vessels | Additional Paid-in Capital | Additional Paid-in Capital OCC vessels | Additional Paid-in Capital E.R Vessels | Accumulated Other Comprehensive income/(loss) | Accumulated deficit | Treasury shares | Treasury shares Songa Vessels | Total | OCC vessels | E.R Vessels | Songa Vessels
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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 |  |  |  |  |  |  |  | (1,857) |  |  | (1,857) |  |  |
Net income / (loss) |  |  |  |  |  |  |  | 20,628 |  |  | 20,628 |  |  |
Other comprehensive income / (loss) |  |  |  |  |  |  | 183 |  |  |  | 183 |  |  |
Amortization of share-based compensation (Note 12) |  |  |  | 5,011 |  |  |  |  |  |  | 5,011 |  |  |
Secondary offering expenses |  |  |  | (439) |  |  |  |  |  |  | (439) |  |  |
Acquisition of vessels (Notes 5, 6 and 10), value |  | $ 33 |  |  | $ 42,929 |  |  |  |  |  |  | $ 42,962 |  |
Acquisition of vessels (Notes 5, 6 and 10), shares |  | 3,304,735 |  |  |  |  |  |  |  |  |  |  |  |
BALANCE, value at Jun. 30, 2018 | $ 675 |  |  | 2,170,609 |  |  | 788 | (1,017,532) | 0 |  | 1,154,540 |  |  |
BALANCE, shares at Jun. 30, 2018 | 67,464,739 |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  | (45,515) |  |  | (45,515) |  |  |
Amortization of share-based compensation (Note 12) |  |  |  | 2,857 |  |  |  |  |  |  | 2,857 |  |  |
Acquisition of vessels, value |  |  |  |  |  |  |  |  |  | $ (93) |  |  |  | $ (93)
Acquisition of vessels (Notes 5, 6 and 10), value |  |  | $ 10 |  |  | $ 10,053 |  |  |  |  |  |  | $ 10,063 |
Acquisition of vessels (Notes 5, 6 and 10), shares |  |  | 999,336 |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock (Note 10), value | $ (19) |  |  | (14,593) |  |  |  |  | 3,145 |  | (11,467) |  |  |
Purchase of treasury stock (Note 10), shares | (1,876,685) |  |  |  |  |  |  |  |  |  |  |  |  |
BALANCE, value at Jun. 30, 2019 | $ 917 |  |  | $ 2,500,746 |  |  | $ 0 | $ (1,025,680) | $ (93) |  | $ 1,475,890 |  |  |
BALANCE, shares at Jun. 30, 2019 | 91,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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