Represents the percentage at which the options granted under the plan would vest per year.

No definition available.

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- Definition

Represents the period in which the plan would be in effect, starting from the day the plan was adopted.

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Issued Ratio

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Issued Ratio, Actual Amount

+ 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=96867065&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ 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)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Details

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Benefit Plans - Long-Term Incentive Plan (Details)	12 Months Ended
Benefit Plans - Long-Term Incentive Plan (Details)	Dec. 31, 2017 shares	May 31, 2017 shares	May 31, 2015 shares	May 31, 2014 shares	May 31, 2004 shares
2004 Long-Term Incentive Plan
Share based plans
Shares authorized					525,500
Term of plan (in years)	10 years
Vesting percentage per year	33.30%
Number of options outstanding (in shares)	114,454
Granted (in shares)	0
2012 Plan
Share based plans
Shares authorized		3,580,000	620,000	800,000
Term of plan (in years)	10 years
Number of options outstanding (in shares)	755,362
Granted (in shares)	3,594,149
2012 Plan \| Minimum
Share based plans
Award vesting period (in years)	1 year
2012 Plan \| Maximum
Share based plans
Award vesting period (in years)	3 years
2014 Plan
Share based plans
Shares authorized				1,420,000
2017 Plan
Share based plans
Shares authorized		5,000,000
2015 Equity Based Compensation Plan
Share based plans
Shares authorized	250,000		2,500,000
Number of options outstanding (in shares)	36,175
Shares issued ratio, actual number of shares	2
Shares issued ratio	1
Granted (in shares)	0
2005 Long-Term Incentive Plan
Share based plans
Number of options outstanding (in shares)	48,532
Granted (in shares)	0