Property and equipment (Tables)

3 Months Ended

Mar. 31, 2014

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


	Estimated Useful Life (Years)		March 31, 2014			December 31, 2013
Land		—	$	5,273		$	5,273
Buildings		39-40		54,948			54,948
Building improvements		5-40		114,099			114,099
Machinery and equipment		3-15		82,189			82,189
Furniture, fixtures and office equipment		5-10		5,046			5,046
Computer equipment and software		3		11,306			11,289
Leasehold improvements		4		17			17
Construction in progress				17,041			14,756

				289,919			287,617
Less accumulated depreciation and amortization				(113,582	)		(111,060	)

Property and equipment — net			$	176,337		$	176,557

Depreciation and Amortization Expense

Depreciation and amortization expense related to property and equipment for the three months ended March 31, 2014 and 2013 was as follows (in thousands):


	Three months ended March 31,
	2014		2013
Depreciation and amortization expense	$	2,522	$	2,990