Fixed Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 66,507,000	$ 58,073,000
Less: Accumulated depreciation and amortization	(32,846,000)	(31,630,000)
Fixed assets, net	33,661,000	26,443,000
Net loss (gain) on disposal of fixed assets	(233,000)	(15,343,000)	$ 2,346,000
Depreciation, Amortization and Accretion, Net	7,300,000	7,400,000	7,000,000.0
Depreciation, Amortization and Accretion, Net	7,300,000	7,400,000	7,000,000.0
Telephone and computer equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	7,556,000	3,301,000
Computer software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	8,952,000	4,214,000
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,526,000	2,829,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	40,301,000	37,652,000
Assets acquired under capital leases-equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	6,172,000	10,077,000
Depreciation	1,300,000	1,600,000	$ 1,000,000.0
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	$ 2,200,000	$ 5,000,000.0