Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Schedule of Property and Equipment

Property and equipment are stated at cost, less accumulated depreciation. Depreciation is computed using the straight-line method over the estimated useful lives of the respective assets. The estimated useful lives, by asset class, are as follows:

Computer equipment	3 years
Software, including internal-use software	1 to 6 years
Office equipment	5 years
Furniture and fixtures	7 years

Property and equipment at December 31, 2017 and 2016 consisted of the following (in thousands):  

	2017			2016
Computer equipment	$	10,985		$	9,568
Software, including internal-use software	78,410			68,980
Office equipment and furniture	6,111			5,073
Leasehold improvements	3,576			3,040
	99,082			86,661
Less accumulated depreciation	(62,368		)	(54,005		)
	$	36,714		$	32,656