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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of share-based compensation expense | The following table provides the total share-based compensation expense included in general and administrative expenses during the years ended December 31, 2020, 2019 and 2018:
| 2020 |  | 2019 |  | 2018
Management and director options | $ | — |  |  | $ | — |  |  | $ | 275 |
Restricted shares with service condition | 2,812 |  |  | 1,927 |  |  | 611 |
Restricted shares with service and performance condition | 3,824 |  |  | 5,134 |  |  | 4,070 |
| $ | 6,636 |  |  | $ | 7,061 |  |  | $ | 4,956 |
Schedule of management and director options activity | The management and director options activity for the years ended December 31, 2020, 2019 and 2018 were as follows:
| Number of options |  | Weighted average exercise price
Balance as of January 1, 2018 | 8,888,053 |  |  | $ | 13.43 |
Forfeited | — |  |  | — |
Exercised | — |  |  | — |
Balance as of January 1, 2019 | 8,888,053 |  |  | 13.43 |
Forfeited | (393,717) |  |  | 14.73 |
Exercised | (187,678) |  |  | 10.00 |
Balance as of January 1, 2020 | 8,306,658 |  |  | 13.45 |
Forfeited | — |  |  | — |
Exercised | — |  |  | — |
Balance as of December 31, 2020 | 8,306,658 |  |  | $ | 13.45 |
Schedule of management and director options outstanding | The following table summarizes information about the Company’s management and director share options outstanding as of December 31, 2020:
| Options outstanding |  | Options exercisable
Range of exercise prices | Number of options |  | Weighted average exercise price |  | Remaining contractual life |  | Number of options |  | Weighted average exercise price
$10.00 - $10.89 | 4,774,694 |  |  | $ | 10.04 |  |  | 1.1 years |  | 4,774,694 |  |  | $ | 10.04 |
$15.05 - $16.89 | 1,800,866 |  |  | $ | 15.92 |  |  | 1.3 years |  | 1,800,866 |  |  | $ | 15.92 |
$20.00 - $25.05 | 1,731,098 |  |  | $ | 20.28 |  |  | 1.2 years |  | 1,731,098 |  |  | $ | 20.28 |
| 8,306,658 |  |  | $ | 13.45 |  |  | 1.2 years |  | 8,306,658 |  |  | $ | 13.45 |
Schedule of restricted share award activity | Restricted share award activity for the restricted shares with only a service condition for the years ended December 31, 2020, 2019 and 2018 was as follows:
| Number of non- vested restricted shares |  | Weighted average grant date fair value
Balance as of January 1, 2018 | 18,209 |  |  | $ | 12.15 |
Granted | 50,644 |  |  | 13.45 |
Vested | (44,788) |  |  | 12.97 |
Balance as of January 1, 2019 | 24,065 |  |  | 13.35 |
Granted | 403,360 |  |  | 11.10 |
Forfeited | (36,907) |  |  | 11.31 |
Vested | (49,751) |  |  | 12.40 |
Balance as of January 1, 2020 | 340,767 |  |  | 11.83 |
Granted | 1,029,373 |  |  | 8.30 |
Forfeited | (16,434) |  |  | 9.77 |
Vested | (182,648) |  |  | 10.10 |
Balance as of December 31, 2020 | 1,171,058 |  |  | $ | 8.80 |
Schedule of restricted shares with a service and performance condition activity | Restricted share award activity for the restricted shares with a service and performance condition for the years ended December 31, 2020, 2019 and 2018 was as follows:
| Number of non- vested restricted shares |  | Number of non- vested restricted shares probable of vesting |  | Weighted average grant date fair value
Balance as of January 1, 2018 | 1,855,379 |  |  | 887,203 |  |  | $ | 12.60 |
Granted | 556,403 |  |  | 370,931 |  |  | 14.01 |
Forfeited | (294,977) |  |  | (4,102) |  |  | 13.98 |
Vested | (115,757) |  |  | (115,757) |  |  | 14.00 |
Change in estimated restricted shares considered probable of vesting | n/a |  | 46,945 |  |  | 13.35 |
Balance as of January 1, 2019 | 2,001,048 |  |  | 1,185,220 |  |  | 12.80 |
Granted | 862,176 |  |  | 574,784 |  |  | 10.95 |
Forfeited | (823,977) |  |  | (290,552) |  |  | 11.70 |
Vested | (148,718) |  |  | (148,718) |  |  | 11.40 |
Change in estimated restricted shares considered probable of vesting | n/a |  | (6,698) |  |  | 12.92 |
Balance as of January 1, 2020 | 1,890,529 |  |  | 1,314,036 |  |  | 12.43 |
Granted | 749,322 |  |  | 499,542 |  |  | 9.46 |
Forfeited | (372,476) |  |  | (39,214) |  |  | 12.12 |
Vested | (504,440) |  |  | (504,440) |  |  | 12.16 |
Change in estimated restricted shares considered probable of vesting | n/a |  | 132,656 |  |  | 11.28 |
Balance as of December 31, 2020 | 1,762,935 |  |  | 1,402,580 |  |  | $ | 10.98 |

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