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Share-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2018 | May 31, 2016 | May 31, 2013 | Apr. 30, 2005 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation vested in period, fair value |  |  |  |  | $ 12,376 | $ 12,577 | $ 8,718 |
Excess tax benefit realized from vesting of restricted Common Shares |  |  |  |  | $ 1,289 | $ 1,584 | $ 858 |
Time Based Awards [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common shares, forfeited or cancelled |  |  |  |  | (46,403) | (16,821) |  |
Weighted average grant date fair value, granted |  |  |  |  | $ 30.01 | $ 24.69 | $ 18.73 |
Unrecognized compensation expense |  |  |  |  | $ 3,924 |  |  |
Employee service share-based compensation, nonvested, period for recognition |  |  |  |  | 1 year 3 months 10 days |  |  |
Performance Based Awards [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common shares, forfeited or cancelled |  |  |  |  | (75,840) | (46,996) |  |
Weighted average grant date fair value, granted |  |  |  |  | $ 34.17 | $ 29.41 |  |
Unrecognized compensation expense |  |  |  |  | $ 3,319 |  |  |
Employee service share-based compensation, nonvested, period for recognition |  |  |  |  | 1 year 3 months 7 days |  |  |
Plan 2006 [Member] | Time Based Awards [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation award vesting period |  |  |  |  |  | 3 years | 3 years | 3 years
Plan 2006 [Member] | Performance Based Awards [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation award vesting period |  |  |  |  |  | 3 years | 3 years | 3 years
2016 Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation award reserved for issuance of common shares |  | 1,800,000 |  |  |  |  |  |
Share-based compensation award granted in period |  |  |  |  | 1,200,753 |  |  |
Share-based compensation award, number of shares available for grant |  |  |  |  | 779,684 |  |  |
2016 Plan [Member] | Time Based Awards [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation award granted in period |  |  |  |  | 476,870 |  |  |
2016 Plan [Member] | Performance Based Awards [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation award granted in period |  |  |  |  | 723,883 |  |  |
Share-based compensation award vesting period |  |  |  |  |  | 3 years | 3 years | 3 years
Director Share Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based compensation award reserved for issuance of common shares | 850,000 |  | 700,000 | 500,000 |  |  |  |
Share-based compensation, increase in awards reserved for issuance of common shares | 150,000 |  | 200,000 |  |  |  |  |
Share-based compensation award vesting period |  |  |  |  | 1 year |  |  |
Share-based compensation restricted common shares issued |  |  |  |  | 670,797 |  |  |
Share-based compensation, maximum number of shares issuable |  |  |  |  | 179,203 |  |  |

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117330312&loc=d3e23163-113944 + Details
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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=116856206&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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