Concentration of Risk (Details)	3 Months Ended							12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2014 Consolidated Revenue Customer concentration risk item	Mar. 31, 2013 Consolidated Revenue Customer concentration risk item	Mar. 31, 2014 Consolidated Revenue Customer concentration risk One customer	Mar. 31, 2013 Consolidated Revenue Customer concentration risk One customer	Mar. 31, 2014 Consolidated Revenue Customer concentration risk Second customer	Mar. 31, 2014 Consolidated Revenue Customer concentration risk Third customer	Mar. 31, 2014 Consolidated gross accounts receivable Credit concentration risk item	Dec. 31, 2013 Consolidated gross accounts receivable Credit concentration risk item	Mar. 31, 2014 Consolidated gross accounts receivable Credit concentration risk One customer	Dec. 31, 2013 Consolidated gross accounts receivable Credit concentration risk One customer	Mar. 31, 2014 Consolidated gross accounts receivable Credit concentration risk Second customer	Dec. 31, 2013 Consolidated gross accounts receivable Credit concentration risk Second customer	Mar. 31, 2014 Consolidated gross accounts receivable Credit concentration risk Third customer	Dec. 31, 2013 Consolidated gross accounts receivable Credit concentration risk Third customer
Concentration of risk
Number of customers	3	1					3	3
Percentage of concentration risk			38.10%	11.50%	12.60%	10.20%			22.90%	23.20%	14.60%	14.20%	13.90%	13.60%