Intangible Assets - Changes in Goodwill, Customer Relationships and Trademarks (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 120,343
Amortization	0
Balance at end of period	120,343
Finite-lived Intangible Assets [Roll Forward]
Balance at end of period	19,047
Customer Relationships— Acquired
Goodwill [Roll Forward]
Adjustments	0
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	14,513
Adjustments	0
Amortization	(2,270)
Balance at end of period	12,243
Customer Relationships— Other
Goodwill [Roll Forward]
Adjustments	(28)
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	3,255
Adjustments	(28)
Amortization	(744)
Balance at end of period	2,483
Trademarks
Goodwill [Roll Forward]
Adjustments	0
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	4,598
Adjustments	0
Amortization	(277)
Balance at end of period	$ 4,321