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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2011
Table Text Block [Abstract]  
Changes in the Carrying Amount of Warranty Obligations
The changes in the carrying amount of warranty obligations are as follows:
 
(in thousands)
Total
BALANCE AT DECEMBER 31, 2009
$
3,468

Provision charged to cost of sales
3,678

Usage
(3,258
)
Adjustments to previously provided warranties, net
(477
)
Currency translation
29

BALANCE AT DECEMBER 31, 2010
$
3,440

Provision charged to cost of sales
4,376

Usage
(3,649
)
Adjustments to previously provided warranties, net
(198
)
Currency translation
(59
)
BALANCE AT DECEMBER 31, 2011
$
3,910
Inventories
Inventories
Inventories are stated at the lower of cost, determined on a first-in, first-out basis, or market and include material, capitalized labor and overhead costs. Inventories consisted of the following as of December 31, 2011 and 2010:
 
 
As of December 31,
(in thousands)
2011
 
2010
Raw materials
$
26,645

 
$
23,738

Work in process
33,757

 
33,043

Finished goods
71,834

 
69,852

Total inventories
$
132,236

 
$
126,633