Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2012

Property, Plant and Equipment [Abstract]

The following is a summary of property, plant and equipment, at cost less accumulated depreciation and amortization as of December 31:



	Estimated Useful Life
	(years)	2012	2011
Land and land improvements	0-15	7,652	7,855
Buildings and building equipment	15	67,533	66,261
Machinery, tools and equipment	5-12	118,663	119,780
Leasehold improvements (1)	10	27,026	24,243
Computer equipment	3-5	83,822	78,543
Computer software	5-10	178,590	170,614
Furniture and fixtures	5-8	79,346	76,962
Tooling	3-5	82,539	80,979
Construction in progress		16,739	17,019
Total property plant and equipment, at cost		661,910	642,256
Less accumulated depreciation and amortization		477,565	449,562
Total property plant and equipment, net		184,345	192,694

(1) The estimated useful life for leasehold improvements is the lesser of 10 years or the term of the lease.

- Definition

Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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