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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2013
Accounting Policies [Abstract]  
Components of inventories
Inventories consisted of the following:
 
March 31,
2013
 
December 31,
2012
Raw materials and parts
$
93,781

 
$
94,809

Work-in-progress
36,858

 
33,608

Finished goods
68,935

 
70,522

 
$
199,574

 
$
198,939
Components of other intangible assets
Other intangible assets consisted of the following:
 
March 31, 2013
 
December 31, 2012
 
Gross
Amount
 
Accumulated
Amortization
 
Gross
Amount
 
Accumulated
Amortization
Customer relationships
$
96,312

 
$
(22,687
)
 
$
96,575

 
$
(21,928
)
Proven technology and patents
42,074

 
(28,234
)
 
42,960

 
(28,014
)
Tradename (finite life)
4,018

 
(1,343
)
 
3,972

 
(1,345
)
Tradename (indefinite life)
25,018

 
—

 
25,061

 
—

Other
741

 
(410
)
 
745

 
(462
)
 
$
168,163

 
$
(52,674
)
 
$
169,313

 
$
(51,749
)
Changes to the Company's accrual for product warranties
Changes to the Company’s accrual for product warranties for the three months ended March 31 are as follows:
 
March 31,
2013
 
March 31,
2012
Balance at beginning of period
$
16,295

 
$
16,748

Accruals for warranties
4,515

 
3,898

Foreign currency translation
(258
)
 
282

Payments / utilizations
(5,002
)
 
(4,236
)
Balance at end of period
$
15,550

 
$
16,692