Allocated share based compensation expenses description.

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- Definition

Cash received for the exercise of stock option awards.

+ References

No definition available.

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- Definition

Excess tax benefits from share-based awards description.

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No definition available.

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- Definition

Intrinsic value of stock option awards description.

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No definition available.

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- Definition

Share based compensation arrangement by share based payment award expiration period

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award options vested and expected to vest percentage after one year.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award options vested and expected to vest percentage after three year.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award options vested and expected to vest percentage after two year.

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

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- Definition

Number of common shares reserved for future issuance related to deferred compensation arrangements with individuals.

+ References

No definition available.

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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 6, 7

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-Topic 710

-SubTopic 10

-Section 30

-Paragraph 1

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Aggregate unrecognized cost of share-based awards, other than options, made to employees under an equity-based compensation plan, that have yet to vest.

+ References

No definition available.

+ Details

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- Definition

Aggregate unrecognized cost of option awards made to employees under a stock option plan or plans, that have yet to vest.

+ References

No definition available.

+ Details

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- Definition

The aggregate cash inflow comprised of the amount received from (a) employees to acquire the entity's shares under incentive awards, including stock option exercises and restricted stock arrangements, and (b) the excess tax benefit arising from such transactions.

+ References

No definition available.

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph i

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 19

-Subparagraph a

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-Publisher FASB

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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

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- Definition

Date the equity-based award expires, in CCYY-MM-DD format.

+ References

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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://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

+ References

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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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

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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- Definition

Number of share options (or share units) exercised during the current period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

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-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

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-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

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- Definition

Value of stock (or other type of equity) forfeited during the period.

+ References

No definition available.

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- Definition

Tax benefits realized from the exercise of stock options resulting in reductions in the entity's income taxes, which increases net cash provided by operating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 20

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Share-Based Compensation (Details Textual) (USD $)	12 Months Ended
Share-Based Compensation (Details Textual) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Number of Shares	0
Stock options exercised	17,757
Stock option forfeitures	0
Share Based Compensation (Textual) [Abstract]
Deferred shares and held by the rabbi trust	184,036
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards	800,000
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards	100,000
Stock option forfeitures	0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remaining to be issued	483,319
Compensation expenses	$ 0
Restricted Stock [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation arrangement share based payment award vesting period	3 years
Time Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expenses	300,000	300,000	200,000
Compensation cost expected to be recognized over period	300,000
Weighted-average period to be recognized	1 year 8 months 12 days
The 1999 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards	300,000
Shares remaining to be issued	0
Option issued under vest plan	50.00%
Option issued under vest plan and granted after 2 years	75.00%
Option issued under vest plan and granted after 3 years	100.00%
Estimated Forfeitures	0
Granted, Number of Shares	0	0
Stock options exercised	17,757	22,025	13,455
Total intrinsic value of stock options under Stock Option Plan	600,000	600,000	400,000
Cash received from Stock Option Exercise	400,000	900,000
Compensation expenses description	Less than 0.1
Compensation expenses		100,000	100,000
Excess tax benefits	100,000	100,000	100,000
The 1999 Stock Option Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option issued under vest plan and expire	10 years
The 1999 Stock Option Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option issued under vest plan and expire	5 years
Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards	900,000
Shares remaining to be issued	57,000
Granted, Number of Shares	8,000
Stock options exercised	1,250	3,000	0
Total intrinsic value of stock options under Stock Option Plan	100,000	100,000
Compensation expenses	300,000	100,000	100,000
LTIP expiry date	Apr. 17, 2018
Excess tax benefits from restricted share awards	100,000	100,000	0
Stock option forfeitures	0
Intrinsic value of stock option awards description	Less than 0.1
Cash received for exercise of Stock Option Awards	100,000	100,000
Weighted average grant date fair value options granted	$ 21.76	$ 19.92	$ 19.47
Excess tax benefits from share-based awards		Less than 0.1
Performance based restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost expected to be recognized over period	2,700,000
Weighted-average period to be recognized	1 year 8 months 12 days
Performance-based compensation expense	2,500,000	2,400,000	2,400,000
Excess tax benefits from restricted share awards	100,000	100,000	0
Long term incentive stock option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for awards	100,000
Granted, Number of Shares			9,500
Weighted-average period to be recognized	2 years
Compensation cost related to Nonvested awards not yet recognized	$ 300,000
Long term incentive stock option [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option issued under vest plan and expire	10 years
Long term incentive stock option [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option issued under vest plan and expire	5 years
Long Term Incentive plan stock option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option issued under vest plan	50.00%
Option issued under vest plan and granted after 2 years	75.00%
Option issued under vest plan and granted after 3 years	100.00%
Granted, Number of Shares	8,000	14,500