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Share Based Compensation (Textual) (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2018 Installment shares | Feb. 01, 2018 shares | Mar. 31, 2018 USD ($) shares | Mar. 31, 2017 USD ($) | Feb. 09, 2018 $ / shares | Dec. 31, 2017 shares
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 |  |  | 632,665 |  |  | 455,643
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | two to three years from the initial grant dates |  |  |
Unrecognized compensation expenses | $ |  |  | $ 3.3 |  |  |
Weighted average period over which options will be recognized |  |  | 1 year 7 months 6 days |  |  |
Share-based compensation expense, capitalized | $ |  |  | $ 0.3 | $ 0.3 |  |
Share-based compensation expense | $ |  |  | $ 1.5 | 1.5 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 178,549 |  |  |
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] |  |  |  |  |  |
Voluntary Termination of Employment Age Limit |  |  | 57 years |  |  |
Restricted Share Rights Awards [Member] | Non-Officer Employees [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 | 44,062 |  |  |  |  |
Number of restricted share right will get settled for common share | 1 |  |  |  |  |
Number of Vesting Installments | Installment | 3 |  |  |  |  |
Restricted Share Rights Awards [Member] | Cliff Vest [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 | 134,487 |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Vesting Date | Apr. 15, 2021 |  |  |  |  |
Restricted Share Rights Awards [Member] | Installment One [Member] | Non-Officer Employees [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Vesting Date | Apr. 15, 2019 |  |  |  |  |
Restricted Share Rights Awards [Member] | Installment Two [Member] | Non-Officer Employees [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Vesting Date | Apr. 15, 2020 |  |  |  |  |
Restricted Share Rights Awards [Member] | Installment Three [Member] | Non-Officer Employees [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Vesting Date | Apr. 15, 2021 |  |  |  |  |
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] | Maximum [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |
Restricted Performance Share Units Plan [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | three-year |  |  |
Unrecognized compensation expenses | $ |  |  | $ 3.5 |  |  |
Weighted average period over which options will be recognized |  |  | 1 year 9 months 18 days |  |  |
Share-based compensation expense, capitalized | $ |  |  | $ 0.5 | 0.5 |  |
Share-based compensation expense | $ |  |  | $ 2.6 | $ 2.4 |  |
Common shares issued for share based compensation |  | 193,516 |  |  |  |
Dividends Payable, Amount Per Share | $ / shares |  |  |  |  | $ 0.18 |
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 |  |  | 609,681 |  |  | 400,488
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 209,193 |  |  |
Restricted Performance Share Units Plan [Member] | Cliff Vest [Member] | Executive Officer [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  |  | three year cliff vesting period |  |  |

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