CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2020		55,243,000
Beginning balance at Dec. 31, 2020	$ 1,130,402	$ 5,524	$ 856,092	$ 256,701	$ (8,285)	$ 20,370
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	54,560			65,129		(10,569)
Stock based compensation expense	4,262		4,262
Common stock transactions related to stock based employee benefit plans (in shares)		114,000
Common stock transactions related to stock based employee benefit plans	(1,901)	$ 12	(18)		(1,895)
Common stock issued for stock options (in shares)		79,000
Common stock issued for stock options	2,270	$ 8	2,262
Dividends on common stock	(7,246)			(7,246)
Increase (decrease) in shares during period (in shares)		193,000
Increase (decrease) in stockholders' equity during period	51,945	$ 20	6,506	57,883	(1,895)	(10,569)
Ending balance (in shares) at Jun. 30, 2021		55,436,000
Ending balance at Jun. 30, 2021	1,182,347	$ 5,544	862,598	314,584	(10,180)	9,801
Beginning balance (in shares) at Mar. 31, 2021		55,294,000
Beginning balance at Mar. 31, 2021	1,155,349	$ 5,529	858,688	290,420	(8,693)	9,405
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	31,806			31,410		396
Stock based compensation expense	2,503		2,503
Common stock transactions related to stock based employee benefit plans (in shares)		94,000
Common stock transactions related to stock based employee benefit plans	(1,495)	$ 10	(18)		(1,487)
Common stock issued for stock options (in shares)		48,000
Common stock issued for stock options	1,430	$ 5	1,425
Dividends on common stock	(7,246)			(7,246)
Increase (decrease) in shares during period (in shares)		142,000
Increase (decrease) in stockholders' equity during period	26,998	$ 15	3,910	24,164	(1,487)	396
Ending balance (in shares) at Jun. 30, 2021		55,436,000
Ending balance at Jun. 30, 2021	$ 1,182,347	$ 5,544	862,598	314,584	(10,180)	9,801
Beginning balance (in shares) at Dec. 31, 2021	58,504,250	58,504,000
Beginning balance at Dec. 31, 2021	$ 1,310,736	$ 5,850	963,851	358,598	(10,569)	(6,994)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(63,195)			53,343		(116,538)
Stock based compensation expense	4,116		4,116
Common stock transactions related to stock based employee benefit plans (in shares)		176,000
Common stock transactions related to stock based employee benefit plans	(1,081)	$ 18	(36)		(1,063)
Common stock issued for stock options (in shares)		180,000
Common stock issued for stock options	3,442	$ 18	3,424
Issuance of common stock, pursuant to acquisitions (in shares)		2,550,000
Issuance of common stock, pursuant to acquisitions	90,234	$ 255	89,979
Conversion of options, pursuant to acquisitions	3,833		3,833
Dividends on common stock	(18,510)			(18,510)
Increase (decrease) in shares during period (in shares)		2,906,000
Increase (decrease) in stockholders' equity during period	$ 18,839	$ 291	101,316	34,833	(1,063)	(116,538)
Ending balance (in shares) at Jun. 30, 2022	61,410,300	61,410,000
Ending balance at Jun. 30, 2022	$ 1,329,575	$ 6,141	1,065,167	393,431	(11,632)	(123,532)
Beginning balance (in shares) at Mar. 31, 2022		61,239,000
Beginning balance at Mar. 31, 2022	1,356,285	$ 6,124	1,062,462	371,192	(10,459)	(73,034)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(17,743)			32,755		(50,498)
Stock based compensation expense	2,697		2,697
Common stock transactions related to stock based employee benefit plans (in shares)		169,000
Common stock transactions related to stock based employee benefit plans	(1,187)	$ 17	(31)		(1,173)
Common stock issued for stock options (in shares)		2,000
Common stock issued for stock options	39		39
Dividends on common stock	(10,516)			(10,516)
Increase (decrease) in shares during period (in shares)		171,000
Increase (decrease) in stockholders' equity during period	$ (26,710)	$ 17	2,705	22,239	(1,173)	(50,498)
Ending balance (in shares) at Jun. 30, 2022	61,410,300	61,410,000
Ending balance at Jun. 30, 2022	$ 1,329,575	$ 6,141	$ 1,065,167	$ 393,431	$ (11,632)	$ (123,532)