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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
December 31, 2018
 
December 31, 2017
Land
$
10,082

 
$
9,408

Facilities and equipment
611,399

 
554,160

Assets under capital leases
107,445

 
82,753

 
728,926

 
646,321

Accumulated amortization (1)
(486,371
)
 
(448,001
)
 
242,555

 
198,320

Construction in progress
55,896

 
56,417

Property, plant and equipment, net
$
298,451

 
$
254,737


(1) Includes $44.2 million and $28.2 million of accumulated amortization related to assets under capital leases at September 30, 2018 and December 31, 2017, respectively.
Rental expense for operating lease agreements was $24.4 million, $18.0 million, and $16.8 million for the years ended December 31, 2018, 2017, and 2016, respectively.