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Commitments and Contingencies Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Letters of Credit Outstanding, Amount	1,519
Disputes [Member]
Commitments and Contingencies	5,535
Minimum [Member]
Employee Agreement, Severance Compensation, Term	6 months
Maximum [Member]
Employee Agreement, Severance Compensation, Term	24 months

Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.

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