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Earnings per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended						6 Months Ended	9 Months Ended
	Nov. 15, 2018	Aug. 30, 2018	Feb. 28, 2018	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Earnings per Share [Line Items]
Total anti-dilutive shares excluded from the calculation (in shares)				25,000			16,000				134,000	38,000
Dividend distribution, cash paid				$ 26,888	$ 26,881	$ 27,065	$ 25,102	$ 25,101	$ 25,102
Number of shares repurchased				0			0			700,000		0
Number of shares repurchased, cost					$ 15,015	$ 10,158				$ 25,200
Stock repurchase program, remaining amount				$ 74,800							$ 74,800
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] | 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
Dividend distribution, cash paid	$ 44,400
Distribution, date of declared		Aug. 30, 2018
Distribution, date to be paid		Nov. 15, 2018
Distribution, date of record		Sep. 27, 2018

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