Goodwill and Other Intangible Assets - Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill and Other Intangible Assets
Amortization expense for intangible assets	$ 42,980	$ 40,310	$ 38,964
Amortization expenses recorded in operating expenses	38,715	37,414	36,241
Cost of revenues
Goodwill and Other Intangible Assets
Amortization expense for intangible assets	$ 4,265	$ 2,896	$ 2,723