Maintained per share dividend amount paid periodically by the Company

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The initial grant date target number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. Does not include adjustment for exceeding/not meeting performance criteria of the grant.

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Fair value of grants made during the period under stock option plans.

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The number of equity-based instruments increased due to exceeding the targeted performance conditions of a grant.

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Vesting Percentage For Stock based Award Target Achievement

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Vesting Range

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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

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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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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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No definition available.

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

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No definition available.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Share-Based Compensation and Capital Stock - Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended									9 Months Ended	12 Months Ended			258 Months Ended
	Oct. 31, 2005	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 $ / shares	Sep. 30, 2018 $ / shares	Jun. 30, 2018 $ / shares	Mar. 31, 2018 $ / shares	Dec. 31, 2017 $ / shares	Sep. 30, 2017 $ / shares	Jun. 30, 2017 $ / shares	Mar. 31, 2017 $ / shares	Sep. 30, 2019 $ / shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared (in dollars per share) \| $ / shares												$ 0.87
Dividends												$ 48,500
Dividends												$ 48,609	$ 48,449	$ 48,682
Number of shares available for grant (in shares) \| shares		2,800,000										2,800,000			2,800,000
Options granted (in shares) \| shares												141,827	109,045	195,652
Options granted, fair value												$ 2,200	$ 1,800	$ 2,100
Aggregate intrinsic value of stock, options, outstanding		$ 36,500										36,500			$ 36,500
Aggregate intrinsic value of the stock options, exercisable		$ 24,800										24,800			$ 24,800
Total intrinsic value of options exercised												15,800	26,400	9,200
Proceeds from exercise of stock options												$ 21,410	$ 41,360	$ 14,107
Stock options exercised (in shares) \| shares												446,456	832,809	353,744
Stock repurchased during period (in shares) \| shares												600,000	1,800,000	3,100	51,100,000
Common stock purchased under stock repurchase program, value												$ 44,100	$ 141,200	$ 200	$ 1,400,000
Common stock split, conversion ratio	2
Shares paid for tax withholding for share-based compensation (in shares) \| shares												79,603	92,366	154,950
Payments related to tax withholding for share-based compensation												$ 6,500	$ 7,400	$ 9,600
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock dividends, periodic payment (dollars per share) \| $ / shares		$ 0.225
Dividends declared (in dollars per share) \| $ / shares			$ 0.215	$ 0.215	$ 0.215	$ 0.215	$ 0.215	$ 0.215	$ 0.215	$ 0.215	$ 0.215		$ 0.86	$ 0.86
Dividends													$ 48,400	$ 48,600
Prior To Stock Split
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased during period (in shares) \| shares															33,000,000.0
Performance Vested Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends												$ 200	$ 100	$ 100
Grants vested (shares) \| shares												73,242	31,048	39,056
Grant date fair value of shares vested												$ 5,500	$ 2,500	$ 1,800
Performance-based leveraging (in shares) \| shares												1,583		9,491
Grants vested, initial target (shares) \| shares												0	416	14,754
Performance Vested Restricted Stock Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting range												0.00%
Vesting percentage for stock-based award target achievement												0.00%
Performance Vested Restricted Stock Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting range												200.00%
Vesting percentage for stock-based award target achievement												175.00%