Major customers (Details)	12 Months Ended
	Dec. 31, 2013 Customers	Dec. 31, 2012 Customers
Major customers (Textual)
Percentage of consolidated net revenues by customers with sales in excess of 10% of consolidated net revenues	39.00%	37.00%
Number of customers with sales in excess of 10% of consolidated net revenues	2	2
Percentage of consolidated net revenues from the Company's top five unaffiliated customers	49.00%	49.00%
Percentage of consolidated accounts receivable from the Company's top five unaffiliated customers	31.00%	23.00%
Number of top unaffiliated customers	5	5