Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Schedule of Allowance for Doubtful Accounts

Activity related to our allowance for doubtful accounts for the years ended December 31, is as follows (in thousands):



	2019			2018			2017
Balance at beginning of period	$	4,880		$	3,534		$	2,622
Charged to expense	1,068			3,601			454
Uncollectible accounts written off, net of recoveries	(2,118		)	(2,255		)	457
Balance at end of period	$	3,830		$	4,880		$	3,534

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 5 years
Office equipment	5 years
Furniture and fixtures	7 years

Property and equipment at December 31, 2019 and 2018, respectively, consisted of the following (in thousands):



	2019			2018
Computer equipment	$	14,249		$	12,258
Software, including internal-use software	89,072			82,426
Office equipment and furniture	7,288			7,315
Buildings	1,666			49,169
Leasehold improvements	6,776			4,394
Total Property and Equipment, Gross	119,051			155,562
Less: Accumulated depreciation	(81,827		)	(72,629		)
Property and Equipment, Net	$	37,224		$	82,933