Lease Commitments - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019		Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease ROU asset	$ 108,974	$ 102,354	[1]	$ 122,300
Lease liability	$ 124,799	$ 117,829
Renewal term	5 years
Termination period	1 year
Sublease income, remainder of 2020	$ 3,200
Sublease income, 2021	4,200
Sublease income, 2022	$ 100
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	11 years
Allen, TX
Lessee, Lease, Description [Line Items]
Operating lease ROU asset	$ 11,455
Lease liability	$ 11,455

[1] Derived from the audited Consolidated Balance Sheet