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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2018
Accounting Policies [Abstract]  
Components of inventories
Inventories consisted of the following:
 
June 30,
2018
 
December 31,
2017
Raw materials and parts
$
121,265

 
$
118,790

Work-in-progress
50,186

 
43,035

Finished goods
98,596

 
93,565

 
$
270,047

 
$
255,390
Components of other intangible assets
Other intangible assets consisted of the following:
 
June 30, 2018
 
December 31, 2017
 
Gross
Amount
 
Accumulated
Amortization
 
Intangibles, Net
 
Gross
Amount
 
Accumulated
Amortization
 
Intangibles, Net
Customer relationships
$
197,817

 
$
(45,864
)
 
$
151,953

 
$
198,527

 
$
(41,794
)
 
$
156,733

Proven technology and patents
70,156

 
(40,720
)
 
29,436

 
70,311

 
(38,890
)
 
31,421

Tradenames (finite life)
4,494

 
(2,817
)
 
1,677

 
4,518

 
(2,807
)
 
1,711

Tradenames (indefinite life)
35,520

 
—

 
35,520

 
35,562

 
—

 
35,562

Other
3,631

 
(2,359
)
 
1,272

 
3,490

 
(2,199
)
 
1,291

 
$
311,618

 
$
(91,760
)
 
$
219,858

 
$
312,408

 
$
(85,690
)
 
$
226,718