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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Including Equipment Under Capital Lease Obligations
Property, plant and equipment, including equipment acquired under capital lease obligations, are summarized as follows as of December 31, 2016 and 2015:
(in thousands)
Estimated useful life
(in years)
 
2016
 
2015
Land
—

 
$
16,327

 
$
15,452

Buildings and improvements
5-40

 
301,092

 
302,068

Machinery and equipment
3-10

 
257,349

 
253,556

Computer software
3-7

 
176,227

 
125,396

Furniture and office equipment
3-10

 
89,560

 
92,281

Construction in progress
—

 
47,260

 
63,825

 
 
 
887,815

 
852,578

Less: Accumulated depreciation and amortization
 
 
(451,160
)
 
(409,634
)
Property, plant and equipment, net
 
 
$
436,655

 
$
442,944