Property, Plant And Equipment (Tables)

12 Months Ended

Dec. 31, 2016

Property Plant And Equipment [Abstract]

Schedule Of Property, Plant And Equipment

			December 31,
(in thousands)			2016		2015
	Land	$	6,169	$	6,169
	Buildings and building improvements		90,330		89,720
	Machinery and equipment		445,537		432,582
	Furniture and fixtures		8,089		8,049
	Vehicles		1,231		1,009
	Leasehold improvements		21,167		19,729
			572,523		557,258
	Less accumulated depreciation		(406,375)		(379,088)
		$	166,148	$	178,170