Shareholders' Equity (Details)											12 Months Ended			163 Months Ended	206 Months Ended	222 Months Ended
	Nov. 10, 2023 $ / shares	Aug. 16, 2023 USD ($) shares	May 18, 2023 $ / shares	Apr. 18, 2023 $ / shares	Mar. 01, 2023 $ / shares	Nov. 08, 2022 $ / shares	May 18, 2022 $ / shares	Dec. 10, 2021 USD ($) $ / shares shares	Nov. 09, 2021 $ / shares	May 17, 2021 $ / shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Nov. 03, 2022 USD ($)	Mar. 13, 2020 USD ($)
Schedule of Shareholders' Equity [Line Items]
Authorized Repurchase											$ 25,000,000			$ 25,000,000	$ 25,000,000	$ 25,000,000	$ 50,000,000	$ 20,000,000
Stock repurchased during period (in shares) | shares											424,777	364,914	480,447			22,445,813
Aggregate price of shares repurchased since inception											$ 26,311,000	$ 13,755,000	$ 22,466,000			$ 303,076,000
Average price of shares repurchased since inception (per share) | $ / shares											$ 61.94	$ 37.69	$ 46.76			$ 13.50
Dividends declared (in dollars per share) | $ / shares											$ 0.32	$ 0.29	$ 0.25
Cash dividends paid											$ 26,400,000	$ 22,900,000	$ 19,900,000
Contingent consideration (Note 4)													$ 66,000,000
Common Stock, Dividends, Per Share, Cash Paid | $ / shares	$ 0.32		$ 0.32	$ 0.32	$ 0.32	$ 0.32	$ 0.26		$ 0.26	$ 0.26
Stockholders' Equity Note, Stock Split, Number Of Additional Shares Issued During Split | shares		1
Stockholders' Equity Note, Stock Split, Number Of Shares Held By Shareholder Before Split | shares		2
Payments For Stock Split		$ 500,000
Retained earnings		100,000									612,835,000	461,657,000		612,835,000	612,835,000	$ 612,835,000
Common stock, $.004 par value, 100,000,000 shares authorized, 81,508,381 and 80,137,776 issued and outstanding at December 31, 2023 and 2022, respectively2		$ 100,000									326,000	$ 322,000		326,000	326,000	326,000
Stock split, conversion ratio		1.5
BasX, LLC
Schedule of Shareholders' Equity [Line Items]
Contingent consideration (Note 4)								$ 78,000,000
Contingent consideration paid in business combination (in shares) | shares								1,560,000
Equity interests issuable (in dollars per share) | $ / shares								$ 0.004
Contingent liability											$ (60,000,000)			$ (60,000,000)	$ (60,000,000)	$ (60,000,000)
Stock issued during period, shares, issued for services (in shares) | shares												580,000	730,000
Regular Semi-Annual Dividend
Schedule of Shareholders' Equity [Line Items]
Dividends declared (in dollars per share) | $ / shares	$ 0.08		$ 0.08	$ 0.08	$ 0.08	$ 0.16	$ 0.13		$ 0.13	$ 0.13
Open market
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares) | shares											402,873	183,168	0	6,893,924
Aggregate price of shares repurchased since inception											$ 25,009,000	$ 6,823,000	$ 0	$ 106,625,000
Average price of shares repurchased since inception (per share) | $ / shares											$ 62.08	$ 37.25	$ 0	$ 15.47
401(k)
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares) | shares											0	155,904	446,658			12,462,552
Aggregate price of shares repurchased since inception											$ 0	$ 5,913,000	$ 20,876,000			$ 171,789,000
Average price of shares repurchased since inception (per share) | $ / shares											$ 0	$ 37.93	$ 46.74			$ 13.78
Employees
Schedule of Shareholders' Equity [Line Items]
Stock repurchased during period (in shares) | shares											21,904	25,842	33,789		3,089,337
Aggregate price of shares repurchased since inception											$ 1,302,000	$ 1,019,000	$ 1,590,000		$ 24,662,000
Average price of shares repurchased since inception (per share) | $ / shares											$ 59.44	$ 39.43	$ 47.06		$ 7.98