Goodwill and Intangible Assets - Analysis of goodwill and intangible assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill
Goodwill, beginning of year	$ 344,865	$ 314,629
Goodwill, acquisitions	8,389	31,677
Goodwill, foreign currency translation adjustment	(11,181)	(1,441)
Goodwill, end of year	342,073	344,865	$ 314,629
Intangible assets (indefinite life)
Intangible assets with an indefinite life, beginning of year	71,357	79,219
Intangible assets with an indefinite life, acquisitions	0	0
Indefinite lived intangible assets, impact of deconsolidation of Somers		(7,650)
Intangible assets with an indefinite life, foreign currency translation adjustment	(2,576)	(212)
Intangible assets with an indefinite life, end of year	68,781	71,357	79,219
Intangible assets (finite life)
Intangible assets with a finite life, beginning of year	528,761	299,015
Intangible assets with a finite life, acquisitions	0	318,459
Intangible assets with a finite life, amortization	(106,200)	(82,955)	(69,031)
Intangible assets with a finite life, foreign currency translation adjustment	(29,126)	(5,758)
Intangible assets with a finite life, end of year	393,435	528,761	299,015
Total
Goodwill and intangible assets, beginning of year	944,983	692,863
Goodwill and intangible assets, acquisitions	8,389	350,136
Indefinite Lived and Finite Lived Intangible Assets Decrease Due To Deconsolidation		(7,650)
Goodwill and intangible assets, foreign currency movements and other adjustments	(42,883)	(7,411)
Goodwill and intangible assets, end of year	804,289	944,983	692,863
Goodwill and intangible assets, gross balance	1,523,775
Intangible assets with a finite life, accumulated amortization	(678,020)	(571,839)
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments	(41,466)	1,436
Goodwill and intangible assets	804,289	944,983	$ 692,863
Goodwill
Goodwill
Goodwill, end of year	342,073
Total
Goodwill and intangible assets, beginning of year	344,865
Goodwill and intangible assets, end of year	342,073	344,865
Goodwill, gross balance	351,231
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments	(9,158)	2,023
Goodwill and intangible assets	342,073	$ 344,865
Intangible assets with an indefinite life
Intangible assets (indefinite life)
Intangible assets with an indefinite life, end of year	68,781
Total
Indefinite-lived intangible assets, gross balance	70,246
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments	(1,465)
Intangible assets with a finite life
Intangible assets (finite life)
Intangible assets with a finite life, end of year	393,435
Total
Intangible assets with a finite life, gross balance	1,102,298
Intangible assets with a finite life, accumulated amortization	(678,020)
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments	$ (30,843)