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Legal Matters (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jun. 30, 2012
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded, Value	$ 15,475
Estimated Litigation Liability		4,293
Maximum [Member]
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Maximum		23,374
Minimum [Member]
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Minimum		$ 25

The estimated maximum amount of possible loss from the contingency.

The estimated minimum amount of possible loss from the contingency.