Commitments and Contingencies (Customer Concentrations) (Details)	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended
	Sep. 30, 2013 Accounts Receivable [Member]	Dec. 31, 2012 Accounts Receivable [Member]	Sep. 30, 2013 Accounts Receivable [Member] Customer One [Member]	Dec. 31, 2012 Accounts Receivable [Member] Customer One [Member]	Sep. 30, 2013 Accounts Receivable [Member] Customer Two [Member]	Dec. 31, 2012 Accounts Receivable [Member] Customer Two [Member]	Sep. 30, 2013 Accounts Receivable [Member] Customer Three [Member]	Dec. 31, 2012 Accounts Receivable [Member] Customer Three [Member]	Sep. 30, 2013 Accounts Receivable [Member] Customer Four [Member]	Dec. 31, 2012 Accounts Receivable [Member] Customer Four [Member]	Sep. 30, 2013 Accounts Receivable [Member] Customer Five [Member]	Sep. 30, 2013 Revenues [Member]	Sep. 30, 2012 Revenues [Member]	Sep. 30, 2013 Revenues [Member] Customer One [Member]	Sep. 30, 2012 Revenues [Member] Customer One [Member]	Sep. 30, 2013 Revenues [Member] Customer Two [Member]	Sep. 30, 2012 Revenues [Member] Customer Two [Member]	Sep. 30, 2013 Revenues [Member] Customer Three [Member]	Sep. 30, 2012 Revenues [Member] Customer Three [Member]
Concentration Risk [Line Items]
Number of customers	5	4										3	3
Percentage of concentration risk	80.60%	82.00%	40.20%	63.10%	18.90%	7.70%	10.50%	6.30%	5.90%	5.10%	5.10%	38.60%	55.50%	14.90%	25.80%	13.50%	19.40%	10.20%	10.30%