Balance Sheet Related Information (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Inventories
Inventory, Net, Total	$ 144,310	[1]	$ 105,284	[1]
As Restated [Member]
Inventories
Crude stockpile inventories	53,385	[1]	33,576	[1]
In-process and finished goods inventories	65,049	[1]	47,600	[1]
Other raw material, container, and supplies inventories	25,876	[1]	24,108	[1]
Inventory, Net, Total	$ 144,310	[1]	$ 105,284	[1]

[1] Restated