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Commitments and Contingencies - Purchase Commitments (Details) (Certain Services [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Long-term Purchase Commitment [Line Items]
Minimum commitments	$ 16.1
Minimum [Member]
Long-term Purchase Commitment [Line Items]
Term of non-cancelable purchase commitments	1 year
Maximum [Member]
Long-term Purchase Commitment [Line Items]
Term of non-cancelable purchase commitments	2 years

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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