Defined Contribution Retirement Plan	12 Months Ended
Dec. 31, 2012
Defined Contribution Retirement Plan [Abstract]
Defined Contribution Retirement Plan	14. Defined Contribution Retirement Plan We have a defined contribution retirement plan (the “Retirement Plan”), the terms of which, as amended, allow eligible employees who have met certain age and service requirements to participate by electing to contribute a percentage of their compensation to be set aside to pay their future retirement benefits, as defined by the Retirement Plan. We have agreed to make discretionary contributions to the Retirement Plan. For the years ended December 31, 2012, 2011 and 2010, we made contributions to the Retirement Plan totaling approximately $0.04 million, $0.07 million and $0.07 million, respectively.

The entire disclosure for pension and other postretirement benefits.

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