Schedule of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current:
Inventory	$ 11,951	$ 0
Other	2,468	806
Total current	14,419	806
Non-current:
Asset retirement obligation	165	419
Mineral resources	16,780	16,975
Intangible assets	13,435	0
Stock compensation	1,724	835
Net operating losses	56,156	852
Research and energy tax credits	10,473	0
Alternative Minimum Tax Credit	1,611	0
Other	823	116
Total non-current	101,167	19,197
Current
Inventory	3,395	1,849
Other	541	313
Total current	3,936	2,162
Non-current:
Development costs	0	217
Foreign subsidiary earnings and withholding taxes	32,637	0
Property, plant and equipment and intangible assets	137,010	3,647
Section 174 costs	24,814	20,094
Convertible debt (Notes)	40,478	14,138
Other	6,966	0
Total non-current	241,905	38,096
Net deferred taxes, before valuation allowance	(130,255)	(20,255)
Valuation allowance	(20,631)	0
Total deferred tax	$ (150,886)	$ (20,255)