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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2017
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
2017
 
December 31
2016
Land
 
—
 
$
10,840

 
$
10,606

Land improvements
 
5-20 years
 
14,996

 
15,032

Buildings and improvements (a)
 
5-40 years
 
198,582

 
185,657

Machinery and equipment
 
3-20 years
 
1,599,713

 
1,525,156

Uncompleted construction
 
—
 
24,387

 
21,035

Gross property, plant and equipment
 
 
 
1,848,518

 
1,757,486

Less: Accumulated depreciation
 
 
 
(1,368,771
)
 
(1,267,231
)
Property, plant and equipment, net
 
 
 
$
479,747

 
$
490,255

(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 $5.5 million and $8.7 million of property, plant and equipment under capital leases at December 31, 2017 and 2016, respectively.