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	December 31, 2017			December 31, 2016
Land	$	9,408		$	7,869
Facilities and equipment	554,160			532,122
Assets under capital leases	82,753			54,297
	646,321			594,288
Accumulated amortization (1)	(448,001		)	(423,361		)
	198,320			170,927
Construction in progress	56,417			22,496
Property, plant and equipment, net	$	254,737		$	193,423

(1) Includes $28.2 million and $14.8 million of accumulated amortization related to assets under capital leases at December 31, 2017 and 2016, respectively.

Rent expense for operating lease agreements was $18.0 million, $16.8 million, and $14.3 million for the years ended December 31, 2017, 2016, and 2015, respectively.