Earnings per share.

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- Definition

Retained Percentage limit on value of TRS.

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- Definition

Stock repurchase program unsettled share repurchases.

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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- Definition

Date the declared dividend will be paid, in YYYY-MM-DD format.

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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- Definition

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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- Definition

Date the dividend to be paid was declared, in YYYY-MM-DD format.

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- Definition

Date the holder must own the stock to be entitled to the dividend, in YYYY-MM-DD format.

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- Definition

Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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- Definition

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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Earnings per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Feb. 11, 2022	Dec. 03, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Aug. 30, 2018
Earnings per Share [Line Items]
Total anti-dilutive shares excluded from the calculation (in shares)			48,600	1,100	49,500
Number of shares repurchased			0	489,850	686,240
Number of shares repurchased, cost				$ 15,364	$ 25,173
Stock repurchase program, remaining amount			$ 59,500
Unsettled repurchase shares			0	0
Retained percentage limit on value of TRS			20.00%
Deltic [Member] \| Special Dividend [Member]
Earnings per Share [Line Items]
Dividend payable		$ 276,300
Dividend payable, per share		$ 4.00
Distribution, date of declared		Dec. 03, 2021
Distribution, payable date		Dec. 31, 2021
Deltic [Member] \| Subsequent Event [Member]
Earnings per Share [Line Items]
Dividend payable, per share	$ 0.44
Distribution, date of declared	Feb. 11, 2022
Distribution, date of record	Mar. 04, 2022
Distribution, payable date	Mar. 31, 2022
Maximum [Member]
Earnings per Share [Line Items]
Stock repurchase program, authorized amount						$ 100,000