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Commitments and Contingencies (Details) (Hindo, et al Complaint [Member])	6 Months Ended
	Jun. 30, 2011
Hindo, et al Complaint [Member]
Loss Contingencies [Line Items]
Class action complaint filing date	2003-10-02
Complaint claim types	4
Consolidated amended complaints filing date	2004-09-29
Complaint settlement date	2006-04-21
Settlement amount previously expensed, disclosed and disbursed	30,000,000
Recovery of insurance proceeds pending settlement of Derivative claim	$23 million from relevant carriers

States the date the complaint was formally filed in a court of law, in arbitration or mediation.

The amount of consideration to which the entity agreed to pay in a settlement agreement which resolved the legal matter.

The effective date of a duly executed litigation settlement agreement.