Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-lived Intangible Assets [Roll Forward]
Balance at the beginning of the year, gross	$ 137,258	$ 110,206	$ 97,976
Balance at the beginning of the year, accumulated amortization	58,752	48,271	40,827
Balance at the beginning of the year, net	78,506	61,935	57,149
Additions	3,068	27,052	12,230
Amortization of other intangible assets	11,207	10,481	7,444
Balance at the end of the year, gross	140,326	137,258	110,206
Balance at the end of the year, accumulated amortization	69,959	58,752	48,271
Balance at the end of the year, net	$ 70,367	$ 78,506	$ 61,935
Weighted-average remaining life (in years)	6 years 8 months 12 days	7 years 6 months	7 years 9 months 18 days
Minimum
Finite-lived Intangible Assets [Roll Forward]
Estimated useful lives (in years)	3 months 18 days	6 months	8 months 12 days
Maximum
Finite-lived Intangible Assets [Roll Forward]
Estimated useful lives (in years)	9 years 2 months 12 days	9 years 3 months 18 days	9 years 9 months 18 days