Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Property and equipment

Property and equipment are summarized as follows (in thousands):

	Estimated Useful Life	December 31,
		2019			2018
Land	—	$	21,511		$	21,595
Buildings	30 years	167,852			171,406
Machinery and equipment	3 to 7 years	307,530			287,596
Office equipment and other	3 to 10 years	129,127			100,210
		626,020			580,807
Less accumulated depreciation		(370,115		)	(333,400		)
		$	255,905		$	247,407

Depreciation expense for the years ended December 31, 2019, 2018 and 2017 was $44.2 million, $40.6 million and $42.3 million, respectively.