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Commitments and Contingencies (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Purchase commitments entered in July 2011
Commitments and Contingencies
Advance Deposit	$ 20,000
Total Minimum Commitment	39,271
Remaining Deposit	13,400
Remaining purchase commitments	6,421
Purchase commitments entered in October 2011
Commitments and Contingencies
Advance Deposit	50,000
Total Minimum Commitment	158,000
Remaining Deposit	50,000
Remaining purchase commitments	$ 102,771

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

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