Goodwill and Intangible Assets Goodwill Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill
Goodwill	$ 793,702	$ 748,037	$ 695,044
Addition due to acquisition	43,751	47,850
Purchase accounting adjustments		3,045
Foreign currency translation	1,914	2,098
SCEM
Goodwill
Goodwill	470,875	427,713	397,952
Addition due to acquisition	42,819	31,751
Purchase accounting adjustments		1,276
Foreign currency translation	343	(3,266)
MC
Goodwill
Goodwill	248,725	247,154	240,021
Addition due to acquisition	0	0
Purchase accounting adjustments		1,769
Foreign currency translation	1,571	5,364
AMH
Goodwill
Goodwill	74,102	73,170	$ 57,071
Addition due to acquisition	932	16,099
Purchase accounting adjustments		0
Foreign currency translation	$ 0	$ 0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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