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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Award Termination Period

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Share Based Compensation Arrangement By Share Based Payment Award, Equity Instruments Other Than Options, Conversion Ratio

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Deferred, Number of Annual Distribution Installments

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Share based compensation arrangement by share based payment award equity instruments other than options non cash compensation.

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Share based compensation arrangement by share based payment award equity instruments other than options potential vest, maximum.

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- Definition

Share based compensation arrangement by share based payment award equity Instruments other than options potential vest minimum.

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Exercisable

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercisable, Weighted Average Remaining Contractual Terms

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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

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

Number of shares authorized for issuance under share-based payment arrangement.

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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.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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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Percentage of vesting of award under share-based payment arrangement.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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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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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Share-based compensation plans - Additional Information (Details) $ / shares in Units, $ in Thousands	12 Months Ended			48 Months Ended
	Dec. 31, 2020 USD ($) installment $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2019	Apr. 17, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares of common stock issued (in shares) \| shares					12,000,000
Shares available for grant (in shares) \| shares	9,877,022
Compensation cost for share-based payment arrangements	$ 10,607	$ 14,334	$ 10,730
Related tax benefit recognized in net income	2,686	3,500	2,678
Additional net excess tax benefit realized	2,528	3,520	3,528
Noncash stock-based compensation associated performance contingent restricted stock units	2,023	5,171	4,725
Compensation deferrals in current year	$ 2,593	$ 2,585	$ 1,452
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.33%
Expected life of SARs		6 years	6 years
Total unrecognized compensation cost related to nonvested awards	$ 501
Weighted-average period	13 months
Aggregate intrinsic value of options and SARs exercised	$ 2,771	$ 11,836	$ 9,029
Weighted-average fair value of awards granted (usd per share) \| $ / shares		$ 8.30	$ 6.55
Weighted average remaining contractual life for SAR's, outstanding	6 years 9 months 18 days
Weighted average remaining contractual life for SAR's, exercisable	6 years 3 months 18 days
Aggregate intrinsic value for SAR's, outstanding	$ 7,474
Aggregate intrinsic value for SAR's, exercisable	$ 6,077
Fair market value of the Company’s stock used to calculate intrinsic value (usd per share) \| $ / shares	$ 59.25
Stock Appreciation Rights (SARs) \| Granted 2015 through 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum vesting period				3 years
Term of award	10 years
Unvested award termination period upon change in control	2 years
Stock Appreciation Rights (SARs) \| Awarded after 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum vesting period				3 years
Stock Options and Stock Appreciation Rights Sars
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost for share-based payment arrangements	$ 1,442	$ 3,227	$ 2,415
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to nonvested awards	$ 4,430
Weighted-average period	21 months
Performance period	3 years
Number of common shares to be converted into for each share upon conversion	1
Granted, weighted-average grant date fair value (usd per share) \| $ / shares	$ 52.00	$ 56.04	$ 46.33
Performance Shares \| 2020 PCSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
Total performance contingent restricted stock units vested , minimum (in shares) \| shares	0
Total performance contingent restricted stock units, maximum (in shares) \| shares	304,370
Performance Shares \| 2019 PCSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
Total performance contingent restricted stock units vested , minimum (in shares) \| shares	0
Total performance contingent restricted stock units, maximum (in shares) \| shares	166,080
Performance Shares \| 2018 PCSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested units in period (in shares) \| shares	139,886
Fair value of vested units	$ 8,288
Performance Shares \| 2017 PCSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested units in period (in shares) \| shares		84,522
Fair value of vested units		$ 5,217
Performance Shares \| 2016 PCSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested units in period (in shares) \| shares			132,534
Fair value of vested units			$ 7,042
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested units in period (in shares) \| shares	0
Granted, weighted-average grant date fair value (usd per share) \| $ / shares	$ 54.16
Restricted Stock Awards \| Executives and Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to nonvested awards	$ 5,468
Weighted-average period	33 months
Noncash stock-based compensation associated performance contingent restricted stock units	$ 4,549	3,351	2,138
Restricted Stock Awards \| Share-based Compensation Award, Tranche One \| Executives and Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.33%
Restricted Stock Awards \| Share-based Compensation Award, Tranche Two \| Executives and Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.33%
Restricted Stock Awards \| Share-based Compensation Award, Tranche Three \| Executives and Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.33%
Restricted Stock Units (RSUs) \| Executive Officers and Key Management Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum vesting period	3 years
Restricted Stock Units (RSUs) \| Executives and Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum vesting period	5 years
Fair value of vested units	$ 3,277	$ 3,217	$ 6,900
Granted, weighted-average grant date fair value (usd per share) \| $ / shares	$ 54.16	$ 57.76	$ 48.36
Restricted Stock Units (RSUs) \| Share-based Compensation Award, Tranche Three \| Executives and Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.33%
Restricted Stock Units (RSUs) \| Share-based Compensation Award, Tranche Four \| Executives and Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.33%
Restricted Stock Units (RSUs) \| Share-based Compensation Award, Tranche Five \| Executives and Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.33%
Deferred Stock Equivalent Units \| Share-based Compensation Award, Tranche One \| Non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of annual distribution installments \| installment	1
Deferred Stock Equivalent Units \| Share-based Compensation Award, Tranche Two \| Non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of annual distribution installments \| installment	3
Deferred Stock Equivalent Units \| Share-based Compensation Award, Tranche Three \| Non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of annual distribution installments \| installment	5