Nature of Operations and Summary of Significant Accounting Policies Narrative (Details) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 USD ($) customers	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2011 Czech koruna against Euro [Member] CZK	Dec. 31, 2011 Euro against U.S. dollar [Member] EUR (€)	Dec. 31, 2011 Czech koruna against U.S. Dollar [Member] CZK	Dec. 31, 2011 Japanese Yen against U.S. dollar [Member] JPY (¥)	Dec. 31, 2010 Japanese Yen against U.S. dollar [Member] JPY (¥)	Dec. 31, 2011 Euros against the Czech koruna [Member] EUR (€)	Dec. 31, 2010 Euros against the Czech koruna [Member] EUR (€)	Dec. 31, 2011 Norwegian kroner against euro [Member] NOK	Dec. 31, 2011 British pounds against the U.S. dollar [Member] GBP (£)	Dec. 31, 2010 U.S. dollars against the euro [Member] USD ($)	Dec. 31, 2010 Austrailian dollars against the U.S. dollar [Member] AUD	Dec. 31, 2010 British pounds against the euro [Member] GBP (£)	Dec. 31, 2010 Foreign Exchange Forward [Member] USD ($)
Minimum ownership percentage of investments in affiliates required to be accounted for under the equity method	20.00%
Maximum ownership percentage of investments in affiliates required to be accounted for under the equity method	50.00%
Minimum maturity duration of short-term, highly liquid variable-rate intruments	3 months
Maximum maturity duration of short-term, highly liquid variable-rate intruments	6 months
Foreign currency translation adjustments	$ 12,635	$ 14,938
Pension liability adjustments, net of taxes	(9,642)	(5,127)
Warranty expense	7,420	5,893	3,316
Percentage of sales from foreign countries	58.00%	57.00%	59.00%
Number of top customers used for evaluation of credit risk of consolidated sales	10
Maximum percentage of consolidated sales attributable to one customer	10.00%	10.00%	10.00%
Percentage of sales from top ten customers	36.00%	38.00%	47.00%
Allowance for doubtful accounts	2,360	3,008
Inventory, Net [Abstract]
Raw materials and supplies	64,832	35,565
Work in process	36,045	23,643
Finished goods	48,945	45,227
Inventories, net	149,822	104,435
Gain (loss) on foreign currency hedges	1,233	(630)	1,492
Forward currency contract amounts				17,500	11,500	4,700	130,000	386,853	3,340	16,900	3,000	250	5,000	500	75
Fair value of derivative assets	489
Fair value of derivative liability	107															807
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	12,101	8,764	8,636
Warranty usage	(8,085)	(3,827)	(4,335)
Acquired warranty reserves	1,745	1,271	1,147
Balance at end of period	13,181	12,101	8,764
Pension liability adjustment taxes	(2,633)	(470)
Accumluated other comprehensive income	$ 2,993	$ 9,811