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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2018
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
2018
 
December 31
2017
Land
 
—
 
$
10,621

 
$
10,840

Land improvements
 
5-20 years
 
16,156

 
14,996

Buildings and improvements (a)
 
5-40 years
 
191,072

 
198,582

Machinery and equipment
 
3-20 years
 
1,538,166

 
1,599,713

Uncompleted construction
 
—
 
37,713

 
24,387

Gross property, plant and equipment
 
 
 
1,793,728

 
1,848,518

Less: Accumulated depreciation
 
 
 
(1,323,828
)
 
(1,368,771
)
Property, plant and equipment, net
 
 
 
$
469,900

 
$
479,747

(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 $1.7 million and $5.5 million of property, plant and equipment under capital leases at December 31, 2018 and 2017, respectively.