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Share Based Compensation (Textual) (Details) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 08, 2016 Installment shares | Feb. 22, 2016 shares | Feb. 01, 2016 shares | Mar. 31, 2016 USD ($) shares | Mar. 31, 2015 USD ($) | Feb. 05, 2016 $ / shares | Dec. 31, 2015 shares
Restricted Common Share 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 |  |  |  | 698,382 |  |  | 506,147
Vesting period |  |  |  | 3 years |  |  |
Unrecognized compensation expenses | $ |  |  |  | $ 3.0 |  |  |
Weighted average period over which options will be recognized |  |  |  | 1 year 6 months |  |  |
Stock-based compensation expense | $ |  |  |  | $ 1.2 | $ 1.3 |  |
Stock-based compensation expense, capitalized | $ |  |  |  | $ 0.3 | 0.3 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  |  |  | three years from the initial grant dates |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 195,526 |  |  |
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 Common Share 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 Common Share 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 | 54,168 |  |  |  |  |  |
Number of Vesting Installments | Installment | 3 |  |  |  |  |  |
Restricted Common Share 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 |  | 141,358 |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award, Vesting Date |  | Apr. 15, 2019 |  |  |  |  |
Restricted Common Share 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, 2017 |  |  |  |  |  |
Restricted Common Share 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, 2018 |  |  |  |  |  |
Restricted Common Share 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, 2019 |  |  |  |  |  |
Restricted Performance Share Units Plan [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation expenses | $ |  |  |  | $ 2.6 |  |  |
Weighted average period over which options will be recognized |  |  |  | 1 year 9 months 18 days |  |  |
Stock-based compensation expense | $ |  |  |  | $ 1.7 | 2.4 |  |
Stock-based compensation expense, capitalized | $ |  |  |  | $ 0.5 | $ 0.5 |  |
Common shares issued for share based compensation |  |  | 156,415 |  |  |  |
Vesting Period, Minimum |  |  |  | 3 year |  |  |
Dividends Payable, Amount Per Share | $ / shares |  |  |  |  |  | $ 0.15 |
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 |  |  |  | 595,655 |  |  | 364,267
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 231,388 |  |  |
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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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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