Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary of property and equipment
Property and equipment, at cost	$ 160,645	$ 174,960
Accumulated depreciation	(138,742)	(140,234)
Property and equipment, net	21,903	34,726
Depreciation	12,833	19,829	$ 25,649
Asset impairment charges	900	12,800
Assets held for sale	21,903	34,726
Equipment
Summary of property and equipment
Property and equipment, net		3,100
Assets held for sale		3,100
Buildings
Summary of property and equipment
Property and equipment, net	3,800	3,800
Assets held for sale	3,800	3,800
Land
Summary of property and equipment
Property and equipment, net		1,900
Assets held for sale		1,900
Leasehold improvements
Summary of property and equipment
Property and equipment, at cost	$ 21,988	20,414
Leasehold improvements | Minimum
Summary of property and equipment
Estimated useful lives	1 year
Leasehold improvements | Maximum
Summary of property and equipment
Estimated useful lives	15 years
Furniture and fixtures
Summary of property and equipment
Property and equipment, at cost	$ 18,653	23,872
Furniture and fixtures | Minimum
Summary of property and equipment
Estimated useful lives	4 years
Furniture and fixtures | Maximum
Summary of property and equipment
Estimated useful lives	10 years
Equipment
Summary of property and equipment
Property and equipment, at cost	$ 5,211	12,561
Equipment | Minimum
Summary of property and equipment
Estimated useful lives	2 years
Equipment | Maximum
Summary of property and equipment
Estimated useful lives	10 years
Computer software
Summary of property and equipment
Property and equipment, at cost	$ 88,135	92,033
Asset impairment related to merger	$ 2,100
Computer software | Minimum
Summary of property and equipment
Estimated useful lives	1 year
Computer software | Maximum
Summary of property and equipment
Estimated useful lives	10 years
Data processing equipment
Summary of property and equipment
Property and equipment, at cost	$ 17,482	16,726
Data processing equipment | Minimum
Summary of property and equipment
Estimated useful lives	1 year
Data processing equipment | Maximum
Summary of property and equipment
Estimated useful lives	5 years
Buildings
Summary of property and equipment
Property and equipment, at cost	$ 7,312	7,490
Buildings | Minimum
Summary of property and equipment
Estimated useful lives	1 year
Buildings | Maximum
Summary of property and equipment
Estimated useful lives	30 years
Land
Summary of property and equipment
Property and equipment, at cost	$ 1,864	$ 1,864
Property and equipment, net	1,900
Assets held for sale	$ 1,900