Acquisitions - Pro Forma (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Revenues	$ 1,698,965	$ 1,631,284	$ 1,864,439
Net income	$ 124,909	$ 106,579	$ 164,618
Basic (in dollars per share)	$ 3.05	$ 2.57	$ 3.83
Net income per diluted share (in dollars per share)	$ 3.04	$ 2.56	$ 3.81
AFF
Business Acquisition [Line Items]
Revenues	$ 1,698,965	$ 1,631,284
Net income	$ 124,909	$ 106,579
Basic (in dollars per share)	$ 3.05	$ 2.57
Net income per diluted share (in dollars per share)	$ 3.04	$ 2.56
AFF | Pro Forma
Business Acquisition [Line Items]
Revenues	$ 2,305,860	$ 2,024,055
Net income	$ 156,257	$ 60,059
Basic (in dollars per share)	$ 3.21	$ 1.21
Net income per diluted share (in dollars per share)	$ 3.20	$ 1.21