Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Composition of property and equipment

The composition of property and equipment as of December 31, 2018 and 2019 is as follows (in thousands):

	2018			2019			Estimated useful life (years)
Land	$	7,138		$	7,138		—
Buildings and improvements	20,883			21,143			5-40
Furniture and office equipment	76,856			73,457			5-7
Computer hardware	13,546			10,173			3-7
Computer software	129,519			137,150			3-10
Leasehold improvements	44,215			49,241			3-10
Construction in progress	8,354			7,808			—
	300,511			306,110
Accumulated depreciation and amortization	(177,834		)	(189,081		)
	$	122,677		$	117,029