Inventories (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Comprised inventories
Inventories-gross	$ 121,870	$ 110,087
Impaired inventory	(31,634)	(31,360)
Inventories-gross	90,236	78,727
Inventories included in other assets	(1,426)	(1,426)
Inventories, net	88,810	77,301
Inventories classified as assets held for sale	(88,810)
Inventories, as reported	$ 0	$ 77,301