Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2012

Property, Plant and Equipment [Abstract]

Components of property, plant and equipment

Depreciation or amortization of property and equipment, including assets held under capital leases, is calculated using the straight-line method over the asset’s estimated useful life:

Buildings and leasehold
improvements	2-30 years
Machinery, equipment and rental
tools	7-10 years
Furniture and fixtures	3 years
Transportation equipment	2-5 years
Computer equipment and software	3-7 years

Property and equipment are as follows (in thousands):

	December 31
	2012			2011
Land	$	1,442		$	1,220
Buildings and leasehold improvements	18,520			18,401
Machinery, equipment and rental tools	54,279			44,364
Equipment in progress	9,382			4,048
Furniture and fixtures	1,358			1,288
Transportation equipment	5,136			4,853
Computer equipment and software	6,743			1,900
Property and equipment	96,860			76,074
Less accumulated depreciation	(40,361		)	(32,160		)
Property and equipment, net	$	56,499		$	43,914