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Preferred and Common Shares and Additional Paid in Capital (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 14, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |
Purchase of treasury stock |  | $ 11,467 |
Star Marianne and Star Janni | Step 1 Vessels |  |  |
Class of Stock [Line Items] |  |  |
Number of shares issued as part of the consideration | 999,336 |  |
Shares Repurchased In 2019 |  |  |
Class of Stock [Line Items] |  |  |
Treasury Stock, Shares, Acquired |  | 1,535,322 |
Treasury Stock Acquired, Average Cost Per Share |  | $ 7.45 |
Purchase of treasury stock |  | $ 11,467 |
Treasury Stock, Shares, Retired |  | 1,535,322 |
Shares Repurchased In 2018 |  |  |
Class of Stock [Line Items] |  |  |
Treasury Stock, Shares, Acquired |  |  | 341,363
Treasury Stock, Shares, Retired |  | 341,363 |

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- Definition Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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