Condensed Consolidated Statements of Changes in Equity - USD ($)	Common stock [Member]	Additional paid-in capital ("APIC") [Member]	Retained earnings [Member]	Accumulated other comprehensive loss [Member]	Non-controlling interest ("NCI") [Member]	Total
Balance at Dec. 31, 2020	$ 200,451,000	$ 49,171,000	$ 791,918,000	$ (34,295,000)	$ 5,154,000	$ 1,012,399,000
Balance, shares at Dec. 31, 2020	109,876,428
Net income			121,273,000		4,000	121,277,000
Other comprehensive loss				(17,727,000)	(24,000)	(17,751,000)
Comprehensive income			121,273,000	(17,727,000)	(20,000)	103,526,000
Stock option exercises	$ 17,099,000	(3,184,000)				13,915,000
Stock option exercises, shares	411,856
Issuance of common stock related to vesting of share units	$ 2,059,000	(11,384,000)				(9,325,000)
Issuance of common stock related to vesting of share units, shares	234,822
Share based continuing employment costs related to business combinations	$ (55,510)	7,938,000				$ 7,938,000
Shares forfeited						(55,510)
Stock option compensation expense		5,903,000				$ 5,903,000
Equity-classified share unit expense		9,465,000				9,465,000
Equity-classified share units dividend equivalents		358,000	(358,000)
Acquisition of remaining interest in NCI		(672,000)	70,000		(4,614,000)	(5,216,000)
Cash dividends paid			(76,144,000)		(104,000)	(76,248,000)
Balance at Sep. 30, 2021	$ 219,609,000	57,595,000	836,759,000	(52,022,000)	416,000	1,062,357,000
Balance, shares at Sep. 30, 2021	110,467,596
Balance at Jun. 30, 2021	$ 215,666,000	51,800,000	832,037,000	(43,173,000)	5,097,000	1,061,427,000
Balance, shares at Jun. 30, 2021	110,366,808
Net income			32,336,000		21,000	32,357,000
Other comprehensive loss				(8,849,000)	(10,000)	(8,859,000)
Comprehensive income			32,336,000	(8,849,000)	11,000	23,498,000
Stock option exercises	$ 3,942,000	(725,000)				3,217,000
Stock option exercises, shares	100,703
Issuance of common stock related to vesting of share units	$ 1,000	(7,000)				(6,000)
Issuance of common stock related to vesting of share units, shares	85
Share based continuing employment costs related to business combinations		2,707,000				2,707,000
Stock option compensation expense		2,133,000				2,133,000
Equity-classified share unit expense		2,283,000				2,283,000
Equity-classified share units dividend equivalents		76,000	(76,000)
Acquisition of remaining interest in NCI		(672,000)	69,000		(4,692,000)	(5,295,000)
Cash dividends paid			(27,607,000)			(27,607,000)
Balance at Sep. 30, 2021	$ 219,609,000	57,595,000	836,759,000	(52,022,000)	416,000	1,062,357,000
Balance, shares at Sep. 30, 2021	110,467,596
Balance at Dec. 31, 2021	$ 227,504,000	59,535,000	839,609,000	(55,973,000)	388,000	1,071,063,000
Balance, shares at Dec. 31, 2021	110,618,049
Net income			274,368,000		68,000	274,436,000
Other comprehensive loss				(54,399,000)	(58,000)	(54,457,000)
Comprehensive income			274,368,000	(54,399,000)	10,000	219,979,000
Stock option exercises	$ 7,090,000	(1,327,000)				5,763,000
Stock option exercises, shares	155,694
Issuance of common stock related to vesting of share units	$ 2,426,000	(6,143,000)				(3,717,000)
Issuance of common stock related to vesting of share units, shares	97,040
Share based continuing employment costs related to business combinations	$ 2,121,000	3,954,000				6,075,000
Stock option compensation expense		8,871,000				8,871,000
Equity-classified share unit expense		16,450,000				16,450,000
Equity-classified share units dividend equivalents		597,000	(597,000)
Cash dividends paid			(85,284,000)			(85,284,000)
Balance at Sep. 30, 2022	$ 239,141,000	81,937,000	1,028,096,000	(110,372,000)	398,000	1,239,200,000
Balance, shares at Sep. 30, 2022	110,870,783
Balance at Jun. 30, 2022	$ 235,244,000	73,014,000	1,015,301,000	(79,883,000)	409,000	1,244,085,000
Balance, shares at Jun. 30, 2022	110,791,788
Net income			42,909,000		15,000	42,924,000
Other comprehensive loss				(30,489,000)	(26,000)	(30,515,000)
Comprehensive income			42,909,000	(30,489,000)	(11,000)	12,409,000
Stock option exercises	$ 3,536,000	(636,000)				2,900,000
Stock option exercises, shares	75,511
Issuance of common stock related to vesting of share units	$ 58,000	(198,000)				(140,000)
Issuance of common stock related to vesting of share units, shares	3,484
Share based continuing employment costs related to business combinations	$ 303,000	1,560,000				1,863,000
Stock option compensation expense		3,249,000				3,249,000
Equity-classified share unit expense		4,766,000				4,766,000
Equity-classified share units dividend equivalents		182,000	(182,000)
Cash dividends paid			(29,932,000)			(29,932,000)
Balance at Sep. 30, 2022	$ 239,141,000	$ 81,937,000	$ 1,028,096,000	$ (110,372,000)	$ 398,000	$ 1,239,200,000
Balance, shares at Sep. 30, 2022	110,870,783