Intangible Assets - Changes in Goodwill, Customer Relationships and Trademarks (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 120,343
Additions	0
Balance at end of period	120,343
Finite-lived Intangible Assets [Roll Forward]
Balance at end of period	32,855
Customer Relationships— Acquired & Non-Compete Agreements
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	23,852
Additions	0
Amortization	(2,529)
Balance at end of period	21,323
Customer Relationships— Other
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	7,522
Additions	0
Amortization	(1,421)
Balance at end of period	6,101
Trademarks
Finite-lived Intangible Assets [Roll Forward]
Balance at beginning of period	5,708
Additions	0
Amortization	(277)
Balance at end of period	$ 5,431