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Initial Public Offering Restricted Shares Cancelled

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Percentage Of Options And Restricted Shares Granted

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Remaining Shares Available To Be Granted

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- Definition

Tax Benefit From Stock Options Vested

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Unrecognized Compensation Cost Expected To Be Recognized Over Weighted Average Period

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- Definition

Unrecognized Compensation Cost Related To Non Vested Share Based Compensation Expense

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- Definition

Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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- Definition

The amount of expense, net of income tax, 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.

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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- Definition

Value of all classes of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares exclude common shares repurchased by the entity and held as treasury shares.

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- Definition

Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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.

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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.

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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- Definition

Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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No definition available.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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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.

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- Definition

The highest quantity of shares an employee can purchase under the plan per period.

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- Definition

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

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No definition available.

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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.

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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

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Share-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands					12 Months Ended
	Nov. 17, 2015	Sep. 09, 2015	May. 13, 2015	Feb. 25, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares, authorized					200,000,000	200,000,000
Vesting period of options and restricted shares, years					3 years
Share units					0	0	0
Share-based compensation expense					$ 21,237	$ 21,196	$ 31,844
Expiration period, in years					10 years
Income tax benefit recorded					$ 4,870	5,819	5,458
Additional paid-in capital due to tax benefit from dividends on restricted shares					446	401	237
Aggregate intrinsic value of options exercised					21,434	21,202	30,050
Cash received from the exercised share options					20,089
Tax benefit realized from the options exercised					6,892
Unrecognized compensation cost					46,024
Tax benefit from stock options vested					6,915
Fair value of shares vested					$ 17,464	12,797	21,894
Unrecognized compensation cost expected to be recognized over a weighted-average period, years					3 years 2 months 12 days
Aggregate value of issuances					$ 75	$ 75	$ 75
Employee Plans, 1995 And 2002 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share units					0
2010 Employee Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares, authorized					4,000,000
Remaining shares					2,715,908
Percentage of options and restricted shares granted					20.00%
Vesting period of options and restricted shares, years					5 years
2009 Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares, authorized					37,439
Remaining shares					35,215
2003 Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares, authorized					500,000
Remaining shares					377,487
Percentage of options and restricted shares granted					33.00%
Vesting period of options and restricted shares, years					3 years
1995 Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options and restricted shares granted					50.00%
Vesting period of options and restricted shares, years					2 years
Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued					1,838,857
Restricted shares cancelled					230,877
Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares, issued					426	476	586
Restricted shares issued					114,786
Restricted shares cancelled					0
Common stock acquired					64,160	55,756	94,014
Common stock, value					$ 11,437	$ 8,531	$ 13,180
Employees And Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock acquired					18,117	26,734	74,175
Common stock, value					$ 3,229	$ 4,207	$ 9,313
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of options granted	$ 182.075	$ 176.370	$ 181.895	$ 178.840
Share units					156,262
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of options granted					$ 178.84
Share units					10,705
Performance Shares [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share units				10,705
Share-based compensation awards, exercise price				$ 178.84
Performance Shares [Member] \| 2010 Employee Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of options and restricted shares granted					100.00%
Vesting period of options and restricted shares, years					3 years
Performance Shares [Member] \| 2010 Employee Plan [Member] \| Growth In Book Value [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance share unit valuation growth, percentage					50.00%
Performance Shares [Member] \| 2010 Employee Plan [Member] \| Operating Return on Equity [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance share unit valuation growth, percentage					50.00%
Performance Shares [Member] \| 2010 Employee Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of stock per unit awarded					1.75
Performance Shares [Member] \| 2010 Employee Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of stock per unit awarded					0.00