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v3.19.1

Preferred, Common Shares and Additional Paid in Capital - Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 7 Months Ended | 9 Months Ended | 10 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 03, 2019 | Feb. 02, 2017 | Mar. 01, 2018 | Dec. 31, 2016 | Apr. 13, 2016 | Apr. 13, 2015 | May 09, 2016 | Jun. 29, 2018 | Jul. 11, 2014 | Jul. 31, 2016 | Sep. 20, 2016 | Oct. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 29, 2018 | Aug. 03, 2018 | Jul. 06, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued |  |  |  |  |  |  |  |  |  |  | 11,976,745 |  |  |  |  |  |  |
Price per share |  |  |  |  |  |  |  |  |  |  | $ 4.3 |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  |  |  | $ 50,278 |  | $ 0 | $ 51,454 | $ 50,589 |  |  |
Number of shares vested |  |  |  |  |  |  |  |  |  |  |  |  | 809,500 | 1,049,000 | 783,545 |  |  |
Number of shares granted |  |  |  |  |  |  |  |  |  |  |  |  | 672,500 | 944,000 | 1,035,000 |  |  |
Offering expenses |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,032 |  |  |  |  |
Purchase of treasury stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,145 |  |  |  |  |
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 |  |  |  |
Common shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,310,272 | 11,976,745 |  |  |
Stock issued during period, share based compensation |  |  |  |  |  |  |  |  |  |  |  |  | 868,975 | 1,220,825 | 692,595 |  |  |
Issuance of shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 138,453 |  |  |
Equity Incentive Plan 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, share based compensation |  |  |  |  | 131,545 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares vested |  |  |  |  | 135,230 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  | 135,230 |  |  |  |  |  |  |  |  |  |  |  |
Equity Incentive Plan 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, share based compensation |  |  |  | 558,050 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares vested |  |  | 40,000 |  |  |  |  |  |  | 650,000 |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  |  | 690,000 |  |  |  |  |  |  |  |  |  |  |
Two Directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period, share based compensation |  |  |  |  |  |  |  |  | 3,000 |  |  |  |  |  |  |  |  |
Number of shares vested |  |  |  |  |  |  |  |  | 3,000 |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  |  |  |  | 3,000 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secondary offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offering expenses |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,032 |  |  |  |  |
Oaktree and its affiliates | Private placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued |  | 3,244,292 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 |  |
Common shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  | 341,363 |  |  |  |  |
Common shares repurchased, Average price per Share |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.17 |  |  |  |  |
Purchase of treasury stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,145 |  |  |  |  |
Subsequent Event | Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares cancelled | 341,363 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 cancelled |  |  |  |  |  |  |  |  |  |  |  |  | 53,978 |  |  |  |  |
Shares to acquire vessels |  |  |  |  |  |  |  |  |  |  |  |  | 10,277,335 |  |  |  |  |
Augustea Vessels | Initially Issued | Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |
Oaktree Capital Management L.P. | Secondary offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |
Price per share |  |  |  |  |  |  |  | $ 13.10 |  |  |  |  |  |  |  |  |  |

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