Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

Classification	Expected Useful Life
Computer equipment	3 to 5 years
Production machinery and equipment	7 to 10 years
Buildings	25 years

PROPERTY, PLANT AND EQUIPMENT

December 31,	2015			2014
(Dollars in thousands)
Land and buildings	$	73,803		$	91,209
Machinery and equipment	486,612			447,880
Leasehold improvements and others	4,204			6,865
Construction in progress	20,455			59,600
	585,074			605,554
Accumulated depreciation	(350,428		)	(350,519		)
Property, plant and equipment, net	$	234,646		$	255,035