Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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+ Details

Summary of Significant Accounting Policies (Narrative) (Details) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net Loss per Share
Number of shares excluded from the computation of net loss per share	12,732,383	11,284,054	9,344,635
Maximum [Member]
Net Loss per Share
Property and equipment, estimated useful lives	10 years
Minimum [Member]
Net Loss per Share
Property and equipment, estimated useful lives	3 years