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v3.20.1

Preferred, Common Shares and Additional Paid in Capital - Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 6 Months Ended | 10 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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 |  |  |  |  |  |  |

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