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Equity Awards - Restricted Shares Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Restricted Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Unvested Restricted Shares Granted | 253,106 |  |
Unrecognized Compensation Cost | $ 6.3 |  |
Period for Recognition of Share-based Compensation Cost Not yet Recognized | 1 year 9 months 18 days |  |
Restricted shares-based compensation expense | $ 9.5 | $ 8.2 | $ 5.7
Restricted Shares [Member] | Non-employee independent director [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted shares issued related to director fee deferrals | 1,792 | 3,673 | 4,494
Service-based restriced shares [Member] | Dividend Declared |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Unvested Restricted Shares Granted | 49 |  |
Plan 1 [Member] | Service-based restriced shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Unvested Restricted Shares Granted | 131,198 | 190,650 | 139,575
Award requisite service period | 3 years |  |
Plan 2 [Member] | Service-based restriced shares [Member] | Non-employee independent director [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Unvested Restricted Shares Granted | 21,112 | 30,590 | 25,872
Award requisite service period | 1 year |  |
Plan 3 [Member] | Performance-based restriced shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Unvested Restricted Shares Granted | 72,962 |  |
Award requisite service period | 3 years |  |
Risk-Free Interest Rate | 0.28% |  |
Expected Volatility | 35.50% |  |
Plan 5 [Member] | Performance-based restriced shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Unvested Restricted Shares Granted |  | 113,146 |
Plan 6 [Member] | Performance-based restriced shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Unvested Restricted Shares Granted |  |  | 95,882
Plan 7 [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Unvested Restricted Shares Granted | 31,816 |  |
Award requisite service period | 3 years |  |
Plan 8 [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Unvested Restricted Shares Granted | 2,558 |  |
Award requisite service period | 1 year |  |
Plan 9 [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Unvested Restricted Shares Granted |  | 87,034 |
Award requisite service period |  | 3 years |
Risk-Free Interest Rate |  | 0.85% |
Expected Volatility |  | 25.20% |
3 year EPS CAGR metric [Member] | Minimum [Member] | Plan 3 [Member] | Performance-based restriced shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Amount of shares earned % of target award | 0.00% |  |
3 year EPS CAGR metric [Member] | Maximum [Member] | Plan 3 [Member] | Performance-based restriced shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award percentage earned based on metric over the performance period | 50.00% |  |
Amount of shares earned % of target award | 200.00% |  |
Total shareholder return metric [Member] | Plan 4 [Member] | Performance-based restriced shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Unvested Restricted Shares Granted | 25,993 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award percentage attained |  | 126.20% |
Total shareholder return metric [Member] | Maximum [Member] | Plan 3 [Member] | Performance-based restriced shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award percentage earned based on metric over the performance period | 50.00% |  |
Average stock price [Member] | Minimum [Member] | Plan 9 [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Amount of shares earned % of target award |  | 0.00% |
Average stock price [Member] | Maximum [Member] | Plan 9 [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Amount of shares earned % of target award |  | 160.00% |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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