Property and equipment (Tables)

6 Months Ended

Jun. 30, 2016

Property and Equipment, Net and Depreciation and Amortization Expense Related to Property and Equipment

Property and equipment — net consist of the following (dollar amounts in thousands):


	Estimated Useful Life (Years)		June 30, 2016			December 31, 2015
Land		—	$	3,435		$	3,435
Buildings		39-40		21,590			21,590
Building improvements		5-40		60,584			60,584
Machinery and equipment		3-15		67,761			68,434
Furniture, fixtures and office equipment		5-10		4,114			4,114
Computer equipment and software		3		9,519			9,519
Construction in progress				437			586

				167,440			168,262
Less accumulated depreciation and amortization				(120,018	)		(119,513	)

Property and equipment — net			$	47,422		$	48,749

Depreciation and amortization expense related to property and equipment for the three and six months ended June 30, 2016 and 2015 was as follows (in thousands):


	Three months ended June 30,				Six months ended June 30,
	2016		2015		2016		2015
Depreciation and amortization expense	$	589	$	2,740	$	1,179	$	5,117