Earnings per share.

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- Definition

Percentage of total distribution limited to stockholders.

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- Definition

Weighted average price common stock per share.

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No definition available.

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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

Number of shares of equity interests issued or issuable to acquire entity.

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- Definition

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

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- Definition

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

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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. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

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

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- Definition

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

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No definition available.

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- Definition

Amount of stock repurchase plan authorized.

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- Definition

Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, 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 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						1 Months Ended	12 Months Ended
	Feb. 14, 2019	Nov. 14, 2018	Aug. 30, 2018	Feb. 20, 2018	Apr. 26, 2016	Feb. 28, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings per Share [Line Items]
Total anti-dilutive shares excluded from the calculation (in shares)							41,980	250	503
Number of shares issued upon merger				21,981,128
Dividend distribution, cash							$ 102,333	$ 61,931	$ 60,842
Number of shares repurchased							0	0	169,625
Stock repurchase program, period					24 months
Number of shares repurchased, cost									$ 5,956
Maximum [Member]
Earnings per Share [Line Items]
Stock repurchase program, authorized amount			$ 100,000		$ 60,000
Deltic [Member]
Earnings per Share [Line Items]
Number of shares issued upon merger						22,000,000	22,000,000
Deltic [Member] \| Subsequent Event [Member]
Earnings per Share [Line Items]
Dividend payable, per share	$ 0.40
Distribution, date of declared	Feb. 14, 2019
Distribution, date to be paid	Mar. 29, 2019
Deltic [Member] \| Special Distribution [Member]
Earnings per Share [Line Items]
Number of shares issued upon merger							4,814,673
Distribution payable			$ 222,000
Dividend payable, per share			$ 3.54
Distribution, date of declared			Aug. 30, 2018
Distribution, date to be paid			Nov. 15, 2018
Distribution, date of record			Sep. 27, 2018
Percentage of stock portion of special distribution							20.00%
Dividend distribution, cash							$ 44,400
Weighted average price per share		$ 36.88