Balance Sheet Components (Balance Sheet Components) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Balance Sheet Components [Abstract]
Customers	$ 254,816	$ 212,899
Other	3,889	5,976
Total	258,705	218,875
Less allowance for doubtful accounts	5,860	5,322
Total receivables - net	252,845	213,553
Raw materials and components parts	155,577	126,901
Work in process	40,506	23,164
Finished goods	58,175	46,481
Total	254,258	196,546
Land and improvements	30,320	23,956
Buildings and improvements	128,932	127,272
Machinery, equipment and other	278,936	254,649
Office and transportation equipment	98,341	95,141
Construction in progress	8,820	7,003
Total	545,349	508,021
Less accumulated depreciation and amortization	331,632	319,459
Total property, plant and equipment - net	213,717	188,562
Payroll and related items	51,728	46,937
Management incentive compensation	17,402	19,985
Income taxes payable	8,456	6,126
Deferred income taxes	167	723
Insurance	6,495	5,544
Warranty	4,417	3,831
Deferred revenue	7,954	7,172
Restructuring	5,875	3,543
Interest rate exchange agreement		2,328
Liability for uncertain tax positions	1,061	1,647
Accrued interest	1,424
Contingent consideration for acquisition	1,500
Other	24,217	20,043
Total accrued expenses	130,696	117,879
Pension and retiree medical obligations	91,542	74,559
Liability for uncertain tax positions	5,262	5,912
Deferred revenue	3,198	4,225
Other	15,844	10,687
Total other noncurrent liabilities	$ 115,846	$ 95,383