Property, Plant & Equipment (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Property, plant and equipment	$ 118,145,000		$ 109,407,000
Accumulated depreciation	(56,767,000)		(52,929,000)
Property, plant and equipment — net	61,378,000		56,478,000
Capital expenditures in progress	4,037,000		5,953,000
Capitalized interest expense	66,000	37,000
Commitments for capital expenditures in progress	$ 1,053,000		$ 4,629,000