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Share-based compensation plans - Compensation (Details)
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Jul. 12, 2012
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|---|---|
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Employees Deferred Compensation Plan [Member]
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| Other Share-Based Compensation [Line Items] | |
| Common Stock Units for Deferred Compensation | 170,618 |
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Non-employee Directors Deferred Compensation Plan [Member]
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| Other Share-Based Compensation [Line Items] | |
| Common Stock Units for Deferred Compensation | 23,023 |