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Common stock (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Dividends declared per common share	$ 0.8750	$ 0.8550	$ 0.8350
Dividends declared to common stockholders	$ 178,761	$ 174,084	$ 168,489
Credit agreement limitation on company's subsidiaries ratio of funded debt to capitalization	60.00%
Company's subsidiaries net assets restricted from use for dividend payments	$ 1,900,000
Common stock
Dividends declared to common stockholders	$ 177,900	$ 173,000	$ 167,400
Centennial [Member]
Maximum distributions to the company as a ratio of average consolidated indebtedness to consolidated EBITDA	350.00%

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- Definition

Company's (excluding its subsidiaries) net assets restricted from use for dividend payments.

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- Definition

The maximum distributions to the company by the subsidiary as a ratio of average consolidated indebtedness, as of the last day of fiscal quarter and the three previous quarters, to consolidated EBITDA.

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Ratio of earnings before interest and taxes to interest expense as specified in debt convenants.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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