Lease Commitments - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Renewal term	5 years
Termination period	1 year
Sublease income, 2020	$ 4,250
Sublease income, 2021	4,100
Sublease income, 2022	100
Leases, not yet commenced	$ 2,900,000
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Lease term, not yet commenced	2 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	12 years
Lease term, not yet commenced	6 years