Number of stock incentive plans that the Company currently has

No definition available.

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- Definition

The number of options exercised from plan inception to the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

The number of options granted from plan inception to the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

The number of awards other than options granted from plan inception to the balance sheet date.

+ 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

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

+ 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)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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- Definition

Percentage of vesting of share-based compensation awards.

+ References

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Share-Based Compensation - Plans (Details)	12 Months Ended
Share-Based Compensation - Plans (Details)	Dec. 31, 2017 item shares	Dec. 31, 2016 shares	Dec. 31, 2015 shares
Share-Based Compensation
Number of stock incentive plans \| item	2
Stock incentive plan, vesting period	4 years
Options granted, net of cancellation	0	0
Stock Incentive Plan 2007
Share-Based Compensation
Number of common shares authorized under the plan	9,679,393
Options granted to date	416,500
Non-option awards to date	6,420,855
Exercised to date	300,625
Restricted Stock Units
Share-Based Compensation
Stock incentive plan, vesting period	4 years
Stock Incentive Plan 2001
Share-Based Compensation
Options granted to date	6,438,172
Exercised to date	6,306,821
Options granted, net of cancellation	0	0	0
Vesting Two Years From January 31 of Grant Year \| Restricted Stock Units
Share-Based Compensation
Stock incentive plan, vesting period	24 months
Vesting percentage	50.00%
Vesting Three Years From January 31 of Grant Year \| Restricted Stock Units
Share-Based Compensation
Stock incentive plan, vesting period	36 months
Vesting percentage	25.00%
Vesting Four Years From January 31 of Grant Year \| Restricted Stock Units
Share-Based Compensation
Stock incentive plan, vesting period	48 months
Vesting percentage	25.00%