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Earnings per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands					12 Months Ended
	Feb. 12, 2021	Nov. 15, 2018	Aug. 30, 2018	Feb. 20, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings per Share [Line Items]
Total anti-dilutive shares excluded from the calculation (in shares)					1,100	49,500	42,000
Dividend distribution, cash paid					$ 107,853	$ 107,722	$ 102,333
Number of shares repurchased					489,850	686,240	0
Number of shares repurchased, cost					$ 15,364	$ 25,173
Stock repurchase program, remaining amount					$ 59,500
Unsettled repurchase shares					0	0
Maximum [Member]
Earnings per Share [Line Items]
Stock repurchase program, authorized amount			$ 100,000
Deltic [Member]
Earnings per Share [Line Items]
Number of shares issued upon merger				22,000,000.0
Deltic [Member] | Subsequent Event [Member]
Earnings per Share [Line Items]
Dividend payable, per share	$ 0.41
Distribution, date of declared	Feb. 12, 2021
Distribution, date of record	Mar. 31, 2021
Deltic [Member] | Special Distribution [Member]
Earnings per Share [Line Items]
Number of shares issued upon merger		4,800,000
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
Dividend distribution, cash paid		$ 44,400

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