Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Other Commitments [Line Items]
Unemployment benefits, possible liability with a change in control	$ 45,000
Unemployment benefits, possible liability without a change in control	17,300
Maximum potential capital contributions	22,500
Payments to acquire equity method investment	2,000	$ 0
WorkLLama
Other Commitments [Line Items]
Payments to acquire equity method investment	$ 2,000		$ 4,000
Minimum
Other Commitments [Line Items]
Period for providing minimum compensation salary and continuation of certain benefits to executives under employment agreements	6 months
Severance payment if agreement terminated meeting specific criteria, percentage of annual salary	100.00%
Severance payment if agreement terminated meeting specific criteria, percentage of annual bonus	50.00%
Maximum
Other Commitments [Line Items]
Period for providing minimum compensation salary and continuation of certain benefits to executives under employment agreements	3 years
Severance payment if agreement terminated meeting specific criteria, percentage of annual salary	300.00%
Severance payment if agreement terminated meeting specific criteria, percentage of annual bonus	300.00%