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Share Based Compensation (Textual) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 21, 2019 | Feb. 01, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Jan. 22, 2019
Restricted Share Rights Awards [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  |  | 626,649 |  | 466,439 |
Unrecognized compensation expenses |  |  | $ 3.4 |  |  |
Weighted average period over which options will be recognized |  |  | 1 year 8 months 12 days |  |  |
Stock-based compensation expense |  |  | $ 1.6 | $ 1.5 |  |
Stock-based compensation expense, capitalized |  |  | $ 0.2 | 0.3 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | two to three years from the initial grant dates |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 196,667 |  |  |
Voluntary Termination Of Employment Terms |  |  | after reaching at least age 57 and accumulating at least 15 years of service with the Company |  |  |
Accumulated Service Period For Voluntary Termination | 15 years |  |  |  |  |
Restricted Share Rights Awards [Member] | Executive Officer [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 196,667 |  |  |  |  |
Number of restricted share right will get settled for common share | 1 |  |  |  |  |
Voluntary Termination of Employment Age Limit | 57 years |  |  |  |  |
Restricted Share Rights Awards [Member] | Certain Senior Executives [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |
Period during which operating and balance sheet metrics are achieved |  |  | 3 years |  |  |
Date on which operating and balance sheet metrics are achieved |  |  | Dec. 31, 2021 |  |  |
Date on which first half of any additional shares earned that will vest based on continued service |  |  | Jan. 01, 2022 |  |  |
Date on which second half of any additional shares earned that will vest based on continued service |  |  | Jan. 01, 2023 |  |  |
Intrinsic value |  |  | $ 3.7 |  |  |
Weighted average grant date fair value |  |  | $ 15.61 |  |  |
Restricted Share Rights Awards [Member] | Minimum [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 2 years |  |  |
Restricted Share Rights Awards [Member] | Minimum [Member] | Executive Officer [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Vesting period | 2 years |  |  |  |  |
Restricted Share Rights Awards [Member] | Maximum [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |
Restricted Share Rights Awards [Member] | Maximum [Member] | Executive Officer [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |
Restricted Share Rights Awards [Member] | Maximum [Member] | Certain Senior Executives [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Percentage of additional shares to be earned subject to basic award |  |  | 200.00% |  |  |
Outperformance Feature Shares [Member] | Maximum [Member] | Certain Senior Executives [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 233,890 |  |  |
Restricted Performance Share Units Plan [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |
Unrecognized compensation expenses |  |  | $ 4.0 |  |  |
Weighted average period over which options will be recognized |  |  | 2 years 1 month 6 days |  |  |
Stock-based compensation expense |  |  | $ 2.7 | 2.6 |  |
Stock-based compensation expense, capitalized |  |  | $ 0.4 | $ 0.5 |  |
Common shares issued for share based compensation |  | 147,111 |  |  |  |
Dividends Payable, Amount Per Share |  |  |  |  |  | $ 0.19
Restricted Performance Share Units Plan [Member] | Executive Officer [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  |  | 571,883 |  | 375,550 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 213,728 |  |  |
Performance period |  |  | 3 years |  |  |

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