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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Pennsylvania Sales Taxes [Abstract]
Refund claim for Pennsylvania sales taxes paid in error		$ 2.9
Recorded amount of Pennsylvania refund	2.9
Number of refund claims filed for sales taxes paid in error	2
Number of refund claims with response from Pennsylvania Board of Finance and Revenue	1
Loss Contingencies [Line Items]
Outstanding claims minimum	2.9
Outstanding claims maximum	$ 5

The estimated maximum amount of possible loss from the contingency.

The estimated minimum amount of possible loss from the contingency.