Segments (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Segments	Jun. 30, 2011	Dec. 31, 2011
Segments (Textual) [Abstract]
Number of reportable operating segments			2
Charge related to unexchanged merger shares			$ 3.0	$ 20.0
Percentage of revenue	10.00%	10.00%	10.00%	10.00%
Percentage of accounts receivable	10.00%		10.00%		10.00%