CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ 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
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	22,754			33,719		(10,965)
Stock based compensation expense	1,759		1,759
Common stock transactions related to stock based employee benefit plans (in shares)		20
Common stock transactions related to stock based employee benefit plans	(406)	$ 2			(408)
Common stock issued for stock options (in shares)		31
Common stock issued for stock options	840	$ 3	837
Increase (decrease) in shares during period (in shares)		51
Increase (decrease) in stockholders' equity during period	24,947	$ 5	2,596	33,719	(408)	(10,965)
Ending balance (in shares) at Mar. 31, 2021		55,294
Ending balance at Mar. 31, 2021	1,155,349	$ 5,529	858,688	290,420	(8,693)	9,405
Beginning balance (in shares) at Dec. 31, 2021		58,504
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	(45,452)			20,588		(66,040)
Stock based compensation expense	1,419		1,419
Common stock transactions related to stock based employee benefit plans (in shares)		7
Common stock transactions related to stock based employee benefit plans	106	$ 1	(5)		110
Common stock issued for stock options (in shares)		178
Common stock issued for stock options	3,403	$ 18	3,385
Issuance of common stock, pursuant to acquisition (in shares)		2,550
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	(7,994)			(7,994)
Increase (decrease) in shares during period (in shares)		2,735
Increase (decrease) in stockholders' equity during period	45,549	$ 274	98,611	12,594	110	(66,040)
Ending balance (in shares) at Mar. 31, 2022		61,239
Ending balance at Mar. 31, 2022	$ 1,356,285	$ 6,124	$ 1,062,462	$ 371,192	$ (10,459)	$ (73,034)