Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2014

Property, Plant and Equipment [Abstract]

Property, plant and equipment

Property, plant and equipment consist of the following (in thousands):

	June 30, 2014			December 31, 2013
Land	$	1,764		$	1,764
Facilities and equipment	872,575			855,318
Capital leases	25,680			16,133
	900,019			873,215
Accumulated amortization	(429,904		)	(395,520		)
	470,115			477,695
Construction in progress	12,672			8,578
Property, plant and equipment, net	$	482,787		$	486,273