Share Transactions	3 Months Ended
Mar. 31, 2020
Share Transactions [Abstract]
Share transactions	Share-based compensation The Company uses share-based compensation plans for officers, other employees and directors of the Parent and its subsidiaries to provide competitive compensation opportunities, to encourage long-term service, to recognize individual contributions and reward achievement of performance goals and to promote the creation of long-term value for shareholders by aligning the interests of such persons with those of shareholders. The 2018 Stock Incentive Plan (the “2018 Plan”) became effective as of March 28, 2019 following approval by the Board of Directors of the Company and the listing of the Company’s common shares on the Nasdaq Global Select Market. The 2018 Plan provides for the issuance of restricted share units, performance units, restricted shares, performance shares, share options and share appreciation rights and other equity-based awards to the Company’s employees and directors. The 2018 Plan authorizes the issuance of 907,315 common shares and will terminate on March 28, 2029. As of March 31, 2020, 678,437 shares were available for future issuance. During the first quarter of 2020, the Company granted an aggregate of 63,591 restricted share units and common shares to certain officers, other employees and directors. On the grant date of March 1, 2020, the fair value of the restricted share units and common shares was approximately $23.00 per share. Of the total restricted share units and common shares granted, 14,675 were vested and fully expensed, including 10,870 common shares issued. The remaining 48,916 restricted share units are being amortized over a three-year vesting period, being the requisite service period. There were no forfeitures or expired awards during the first quarter of 2020. The effect of compensation cost arising from share-based payment awards on the Company’s consolidated statement of income (loss), within “general and administrative expenses,” for the three months ended March 31, 2020 and 2019, was $0.6 million and $Nil, respectively, including an accelerated expense recognition for retirement eligible employees. Share repurchase program In the first quarter of 2020, the board of directors of the Parent authorized the Company’s investment in its common shares through a share repurchase program under which the Company may repurchase up to $50 million of its outstanding common shares (the "current share repurchase program"). During the first quarter of 2020, the Company purchased 127,744 shares at an average price per share of $22.42 under the current share repurchase program. As of March 31, 2020, approximately $47.1 million of unused share repurchase capacity remained available under the current share repurchase program. Since the inception of the share repurchase programs in 2019, the Company has repurchased a total of 2.9 million shares. At March 31, 2020, the shares are held in treasury, at an aggregate cost of $77.9 million (excluding transaction costs). Repurchases under the current share repurchase program may be effected from time to time in open market or privately negotiated transactions. The timing and amount of repurchase transactions under this program will depend on a variety of factors, including market conditions and corporate and regulatory considerations. Repurchases of the Company’s common shares in connection with the current share repurchase program and other share-based transactions are recorded at cost and result in a reduction of the Company’s shareholders’ equity in its consolidated balance sheets.

Share-based compensation

The Company uses share-based compensation plans for officers, other employees and directors of the Parent and its subsidiaries to provide competitive compensation opportunities, to encourage long-term service, to recognize individual contributions and reward achievement of performance goals and to promote the creation of long-term value for shareholders by aligning the interests of such persons with those of shareholders.

The 2018 Stock Incentive Plan (the “2018 Plan”) became effective as of March 28, 2019 following approval by the Board of Directors of the Company and the listing of the Company’s common shares on the Nasdaq Global Select Market. The 2018 Plan provides for the issuance of restricted share units, performance units, restricted shares, performance shares, share options and share appreciation rights and other equity-based awards to the Company’s employees and directors. The 2018 Plan authorizes the issuance of 907,315 common shares and will terminate on March 28, 2029. As of March 31, 2020, 678,437 shares were available for future issuance.

During the first quarter of 2020, the Company granted an aggregate of 63,591 restricted share units and common shares to certain officers, other employees and directors. On the grant date of March 1, 2020, the fair value of the restricted share units and common shares was approximately $23.00 per share. Of the total restricted share units and common shares granted, 14,675 were vested and fully expensed, including 10,870 common shares issued. The remaining 48,916 restricted share units are being amortized over a three-year vesting period, being the requisite service period. There were no forfeitures or expired awards during the first quarter of 2020.

The effect of compensation cost arising from share-based payment awards on the Company’s consolidated statement of income (loss), within “general and administrative expenses,” for the three months ended March 31, 2020 and 2019, was $0.6 million and $Nil, respectively, including an accelerated expense recognition for retirement eligible employees.

Share repurchase program

In the first quarter of 2020, the board of directors of the Parent authorized the Company’s investment in its common shares through a share repurchase program under which the Company may repurchase up to $50 million of its outstanding common shares (the "current share repurchase program").

During the first quarter of 2020, the Company purchased 127,744 shares at an average price per share of $22.42 under the current share repurchase program. As of March 31, 2020, approximately $47.1 million of unused share repurchase capacity remained available under the current share repurchase program. Since the inception of the share repurchase programs in 2019, the Company has repurchased a total of 2.9 million shares. At March 31, 2020, the shares are held in treasury, at an aggregate cost of $77.9 million (excluding transaction costs).

Repurchases under the current share repurchase program may be effected from time to time in open market or privately negotiated transactions. The timing and amount of repurchase transactions under this program will depend on a variety of factors, including market conditions and corporate and regulatory considerations. Repurchases of the Company’s common shares in connection with the current share repurchase program and other share-based transactions are recorded at cost and result in a reduction of the Company’s shareholders’ equity in its consolidated balance sheets.