Property and Equipment

12 Months Ended

Dec. 31, 2019

Property Plant And Equipment [Abstract]

Property and Equipment

3. PROPERTY AND EQUIPMENT

Property and equipment and accumulated depreciation and amortization were as follows:

	December 31,
	2019			2018
Property and equipment
Buildings	$	101,707		$	101,421
Software and capitalized software costs		99,125			66,634
Computer equipment		56,879			39,492
Rental clocks		20,836			16,950
Furniture, fixtures and equipment		18,311			16,474
Other		6,242			1,348
		303,100			242,319
Less: accumulated depreciation and amortization		(124,950	)		(82,969	)
		178,150			159,350
Construction in progress		31,274			8,589
Land		29,034			9,023
Property and equipment, net	$	238,458		$	176,962

We capitalize computer software development costs related to software developed for internal use in accordance with ASC 350-40.  For the years ended December 31, 2019 and 2018, we capitalized $30.4 million and $22.0 million, respectively, of computer software development costs related to software developed for internal use.

Rental clocks included in property and equipment, net represent time clocks issued to clients under month-to-month operating leases.

We capitalize interest incurred for indebtedness related to construction in progress.  For the years ended December 31, 2019, 2018 and 2017, we incurred interest costs of $1.6 million, $1.6 million and $1.7 million, respectively.  For the years ended December 31, 2019, 2018 and 2017, interest cost of $0.6 million, $0.8 million and $0.8 million, respectively, was capitalized.  Included in the construction in progress balance at December 31, 2019 and 2018 is $2.2 million and $0.1 million in retainage, respectively.

Depreciation and amortization expense for property and equipment, net was $42.0 million, $29.4 million and $18.5 million for the years ended December 31, 2019, 2018 and 2017, respectively.