Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Stock based compensation awards, fair value of awards outstanding		$ 49,100
Deferred compensation arrangements, liability, noncurrent		36,700
Stock compensation expense (benefit)	$ 1,971	(6,064)
YP Acquisition
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Shares held in escrow (in shares)					1.8
Number of shares expected to be returned by the seller	1.0
Amount to be paid before allowance of tax credit	$ 8,000
Indemnification Asset
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of indemnification asset	0	25,988	$ 0	$ 29,789
Change in fair value	0	$ (3,801)
Indemnification Asset | Fair Value, Inputs, Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value of indemnification asset	$ 24,300		$ 24,300