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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
Property, plant and equipment consist of the following:
(In thousands)
 
Estimated
Useful Lives
 
December 31
2016
 
December 31
2015
Land
 
—
 
$
10,606

 
$
10,932

Land improvements
 
5-20 years
 
15,032

 
15,277

Buildings and improvements (a)
 
5-40 years
 
185,657

 
191,356

Machinery and equipment
 
3-20 years
 
1,525,156

 
1,661,914

Uncompleted construction
 
—
 
21,035

 
36,990

Gross property, plant and equipment
 
 
 
1,757,486

 
1,916,469

Less: Accumulated depreciation
 
 
 
(1,267,231
)
 
(1,352,434
)
Property, plant and equipment, net
 
 
 
$
490,255

 
$
564,035

(a)    Buildings and improvements include leasehold improvements that are amortized over the shorter of their useful lives or the initial term of the lease.
Included in the amounts are $8.7 million and $16.0 million of property, plant and equipment under capital leases at December 31, 2016 and 2015, respectively.