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Stock Options and Restricted Shares - Restricted Share Unit Awards Outstanding (Details) | 3 Months Ended
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Mar. 31, 2018 shares
2018 Restricted granted shares | Tranche 2017 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Service period per tranche (in years) | 2 years |
Subsequent holding period per tranche (in years) | 3 years |
2018 Restricted granted shares | Tranche 2018 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Service period per tranche (in years) | 2 years |
Subsequent holding period per tranche (in years) | 2 years |
2018 Restricted granted shares | Tranche 2019 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Service period per tranche (in years) | 2 years |
Subsequent holding period per tranche (in years) | 1 year |
2018 Restricted granted shares | Named Executive Officers (NEOs) | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares awarded (in shares) | 96,878 | [1]
2018 Restricted granted shares | Named Executive Officers (NEOs) | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares awarded (in shares) | 145,339 | [1]
2018 Restricted granted shares | Leadership Team other than NEOs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares awarded (in shares) | 25,990 |
2017 Restricted granted shares | Tranche 2017 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Service period per tranche (in years) | 2 years |
Subsequent holding period per tranche (in years) | 3 years |
2017 Restricted granted shares | Tranche 2018 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Service period per tranche (in years) | 2 years |
Subsequent holding period per tranche (in years) | 2 years |
2017 Restricted granted shares | Tranche 2019 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Service period per tranche (in years) | 2 years |
Subsequent holding period per tranche (in years) | 1 year |
2017 Restricted granted shares | Named Executive Officers (NEOs) | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares awarded (in shares) | 72,537 | [1]
2017 Restricted granted shares | Named Executive Officers (NEOs) | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares awarded (in shares) | 109,339 | [1]
2017 Restricted granted shares | Leadership Team other than NEOs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares awarded (in shares) | 24,916 |
2016 Restricted granted shares | Tranche 2016 (1) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Service period per tranche (in years) | 2 years |
Subsequent holding period per tranche (in years) | 3 years |
2016 Restricted granted shares | Tranche 2017 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Service period per tranche (in years) | 2 years |
Subsequent holding period per tranche (in years) | 2 years |
2016 Restricted granted shares | Tranche 2018 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Service period per tranche (in years) | 2 years |
Subsequent holding period per tranche (in years) | 1 year |
2016 Restricted granted shares | Named Executive Officers (NEOs) | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares awarded (in shares) | 73,474 | [1]
2016 Restricted granted shares | Named Executive Officers (NEOs) | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares awarded (in shares) | 110,223 | [1]
2016 Restricted granted shares | Leadership Team other than NEOs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares awarded (in shares) | 26,683 |
2015 Restricted granted shares | Tranche 2015 (1) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Service period per tranche (in years) | 2 years |
Subsequent holding period per tranche (in years) | 3 years |
2015 Restricted granted shares | Tranche 2016 (1) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Service period per tranche (in years) | 2 years |
Subsequent holding period per tranche (in years) | 2 years |
2015 Restricted granted shares | Tranche 2017 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Service period per tranche (in years) | 2 years |
Subsequent holding period per tranche (in years) | 1 year |
2015 Restricted granted shares | Named Executive Officers (NEOs) | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares awarded (in shares) | 58,200 | [1]
2015 Restricted granted shares | Named Executive Officers (NEOs) | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares awarded (in shares) | 101,850 | [1]
2015 Restricted granted shares | Leadership Team other than NEOs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares awarded (in shares) | 28,378 |
[1] | The named executive officers are awarded a range of awards that may be earned based on attainment of goals between a target level of performance and a maximum level of performance.

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- Definition Period which an employee's right to hold an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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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- 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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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