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SHARE BASED COMPENSATION, 401(K) PLAN AND DEFERRED COMPENSATION - Narrative (Details) |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 05, 2020 installment shares | Feb. 21, 2019 | Feb. 01, 2019 shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | May 20, 2020 shares | Jan. 22, 2019 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation arrangement by share-based payment award, options, outstanding, number | shares |  |  |  | 300,046 | 334,561 |  |  |
Defined contribution plan, maximum annual contribution per employee, percent |  |  |  | 100.00% |  |  |  |
Defined contribution plan, employer discretionary contribution amount | $ |  |  |  | $ 500,000 | $ 400,000 | $ 500,000 |  |
Threshold age for qualifying retirement |  |  |  | 57 |  |  |  |
Number of vesting installments | installment | 3 |  |  |  |  |  |  |
Number of shares to be issued under deferred compensation plan included in total shares outstanding | shares |  |  |  | 1,200,000 | 1,100,000 |  |  |
Restricted Share Rights Awards |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted share rights outstanding (in shares) | shares |  |  |  | 488,735 | 479,144 |  |  |
Unrecognized compensation expenses | $ |  |  |  | $ 1,800,000 |  |  |  |
Weighted average period over which options will be recognized |  |  |  | 9 months 18 days |  |  |  |
Share-based compensation expense | $ |  |  |  | $ 4,300,000 | $ 3,900,000 | 3,600,000 |  |
Share-based compensation expense, capitalized | $ |  |  |  | $ 400,000 | 300,000 | 600,000 |  |
Granted (in shares) | shares | 183,758 |  |  | 295,049 |  |  |  |
Number of restricted share right will get settled for common share | shares | 1 |  |  |  |  |  |  |
Accumulated service period for voluntary termination | 15 years |  |  |  |  |  |  |
Restricted Share Rights Awards | Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period |  |  |  | 1 year |  |  |  |
Restricted Share Rights Awards | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period | 3 years |  |  | 3 years |  |  |  |
Restricted Performance Share Units Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |  |
Unrecognized compensation expenses | $ |  |  |  | $ 4,500,000 |  |  |  |
Weighted average period over which options will be recognized |  |  |  | 1 year 6 months |  |  |  |
Share-based compensation expense | $ |  |  |  | $ 3,000,000.0 | 4,200,000 | 3,900,000 |  |
Share-based compensation expense, capitalized | $ |  |  |  | $ 400,000 | $ 600,000 | 1,100,000 |  |
Common shares issued for share based compensation | shares |  |  | 121,897 |  |  |  |  |
Dividends payable, amount per share (in usd per share) | $ / shares |  |  |  |  |  |  |  | $ 0.19
Restricted Performance Share Units Plan | Executive Officers |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted share rights outstanding (in shares) | shares |  |  |  | 715,965 | 396,365 |  |  |
Granted (in shares) | shares |  |  |  | 319,600 |  |  |  |
Performance earning potential |  | 200.00% |  |  |  |  |  |
Outperformance feature measurement term |  | 3 years |  | 3 years |  |  |  |
Restricted Performance Share Units Plan | Executive Officers | 2020 Awards |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  | $ 0 |  |  |  |
Awards issuable under outperformance feature (in shares) | shares |  |  |  | 316,306 |  |  |  |
Restricted Performance Share Units Plan | Executive Officers | 2019 Awards |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  | $ 200,000 |  |  |  |
Awards issuable under outperformance feature (in shares) | shares |  |  |  | 233,890 |  |  |  |
Restricted Performance Share Units Plan | Non-Officer Employees |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted share rights outstanding (in shares) | shares | 40,920 |  |  |  |  |  | 70,371 |
Employee Share Purchase Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  | $ 100,000 | $ 100,000 | 100,000 |  |
Share-based compensation, percentage of closing price |  |  |  | 85.00% |  |  |  |
Maximum participant contribution, percentage of compensation |  |  |  | 20.00% |  |  |  |
Maximum participant contribution, dollar amount | $ |  |  |  | $ 50,000 |  |  |  |
Aggregate share-based awards awarded to executives | shares |  |  |  | 1,250,000 |  |  |  |
Stock issued during period, value, employee stock purchase plan | $ |  |  |  | $ 400,000 | $ 500,000 | $ 500,000 |  |
Share-based compensation arrangement by share-based payment award, discount from market price, purchase |  |  |  | 15.00% |  |  |  |

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