Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property, plant and equipment
Land	$ 1,432	$ 713
Building improvements	520,137	499,502
Machinery and equipment	246,584	236,416
Capitalized leases for machinery, equipment and buildings	76,244	72,326
Property, plant and equipment, gross	844,397	808,957
Accumulated depreciation and amortization	(235,528)	(164,414)
Property plant and equipment, net before construction in progress	608,869	644,543
Construction in progress	78,807	23,558
Property, plant and equipment, net	$ 687,676	$ 668,101