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Equity Incentive Plans - Company's Equity Incentive Plans (Details) $ / shares in Units, $ in Thousands |  | 2 Months Ended | 3 Months Ended | 5 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 07, 2019 shares | Feb. 27, 2019 shares | Feb. 27, 2018 shares | Feb. 22, 2017 shares | Apr. 09, 2018 shares | Apr. 13, 2015 $ / shares shares | May 22, 2019 shares | Aug. 31, 2019 shares | Aug. 27, 2018 shares | Aug. 22, 2018 shares | Aug. 22, 2017 shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  |  |  |  |  |  |  | 885,000 | 672,500 | 944,000 |
Number of shares vested during the period |  |  |  |  |  |  |  |  |  |  |  | 756,962 | 809,500 | 1,049,000 |
Dividends on non-vested shares | $ |  |  |  |  |  |  |  |  |  |  |  | $ 14 | $ 0 | $ 0 |
Share based compensation | $ |  |  |  |  |  |  |  |  |  |  |  | $ 7,943 | $ 8,072 | $ 9,267 |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Total unrecognised compensation cost relating to non-vested share option | $ |  |  |  |  |  |  |  |  |  |  |  | $ 42 |  |  |
Total unrecognised compensation cost relating to restricted share awards | $ |  |  |  |  |  |  |  |  |  |  |  | $ 4,347 |  |  |
Weighted average remaining term for non-vested share option awards |  |  |  |  |  |  |  |  |  |  |  | 2 years 1 month 13 days |  |  |
Weighted average remaining term for non-vested restricted share awards |  |  |  |  |  |  |  |  |  |  |  | 3 months 18 days |  |  |
Total fair value of shares vested during the period | $ |  |  |  |  |  |  |  |  |  |  |  | $ 7,703 | $ 10,745 | $ 12,023 |
Number of shares unvested |  |  |  |  |  |  |  |  |  |  |  | 271,038 | 143,000 | 280,000 | 385,000
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  | 104,250 |  |  |  |  |  |  |  |  |
Option exercise price | $ / shares |  |  |  |  |  | $ 27.5 |  |  |  |  |  |  |  |  |
Fair value assumptions - Expected term |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Fair value assumptions - Expected volatility rate |  |  |  |  |  | 59.274% |  |  |  |  |  |  |  |  |
Fair value assumptions - Risk free interest rate |  |  |  |  |  | 1.30% |  |  |  |  |  |  |  |  |
Restricted Share Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total shares authorized | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting rights | Each RSU represents, upon vesting, a right for the beneficiary to receive one common share of the Company. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tranches | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted common shares expected to vest | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Share Units (RSUs) | Tranche One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting date |  |  |  |  |  |  |  |  |  |  |  | Apr. 30, 2021 |  |  |
Shares expected to vest | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Share Units (RSUs) | Tranche Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting date |  |  |  |  |  |  |  |  |  |  |  | Apr. 30, 2022 |  |  |
Shares expected to vest | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted common shares expected to vest |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |
Amortization expense for RSUs expected to vest | $ |  |  |  |  |  |  |  |  |  |  |  | $ 1,235 |  |  |
Restricted Share Units (RSUs) | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fleet performance indices | $ |  |  |  |  |  |  |  |  |  |  |  | 120,000 |  |  |
Restricted Share Units (RSUs) | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fleet performance indices | $ |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 |  |  |
Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  | 276,000 |  |  |  |  |  |  |  |  |  |
Number of shares vested during the period |  |  |  |  |  |  |  |  | 276,000 |  |  |  |  |  |
Equity Incentive Plan 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares reserved for issuance |  |  |  | 950,000 |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  | 944,000 |  |  |  |  |  |  |  |  |  |  |
Number of shares vested during the period |  |  |  |  |  |  |  |  |  | 200,000 | 744,000 |  |  |  |
Equity Incentive Plan 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares reserved for issuance |  |  | 700,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  | 396,500 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares vested during the period |  | 71,500 |  |  |  |  |  |  | 253,500 |  |  |  |  |  |
Equity Incentive Plan 2018 | Vest in February 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting date |  |  |  |  |  |  |  |  |  |  |  | Feb. 27, 2021 |  |  |
Number of shares unvested |  |  |  |  |  |  |  |  |  |  |  | 71,500 |  |  |
Equity Incentive Plan 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares reserved for issuance |  |  |  |  |  |  | 900,000 |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  |  | 885,000 |  |  |  |  |  |  |  |
Number of shares vested during the period |  |  |  |  |  |  |  | 685,462 |  |  |  |  |  |  |
Equity Incentive Plan 2019 | Vest in August 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted common shares expected to vest |  |  |  |  |  |  |  |  |  |  |  | 99,769 |  |  |
Equity Incentive Plan 2019 | Vest in August 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted common shares expected to vest |  |  |  |  |  |  |  |  |  |  |  | 99,769 |  |  |

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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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