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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2018
Accounting Policies [Abstract]  
Components of inventories
Inventories consisted of the following:
 
March 31,
2018
 
December 31,
2017
Raw materials and parts
$
122,851

 
$
118,790

Work-in-progress
51,872

 
43,035

Finished goods
103,595

 
93,565

 
$
278,318

 
$
255,390
Components of other intangible assets
Other intangible assets consisted of the following:
 
March 31, 2018
 
December 31, 2017
 
Gross
Amount
 
Accumulated
Amortization
 
Intangibles, Net
 
Gross
Amount
 
Accumulated
Amortization
 
Intangibles, Net
Customer relationships
$
199,197

 
$
(44,094
)
 
$
155,103

 
$
198,527

 
$
(41,794
)
 
$
156,733

Proven technology and patents
71,370

 
(40,395
)
 
30,975

 
70,311

 
(38,890
)
 
31,421

Tradename (finite life)
4,650

 
(2,943
)
 
1,707

 
4,518

 
(2,807
)
 
1,711

Tradename (indefinite life)
35,614

 
—

 
35,614

 
35,562

 
—

 
35,562

Other
3,661

 
(2,333
)
 
1,328

 
3,490

 
(2,199
)
 
1,291

 
$
314,492

 
$
(89,765
)
 
$
224,727

 
$
312,408

 
$
(85,690
)
 
$
226,718