Share-based Compensation (Details Textual) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Share-based Compensation (Textual) [Abstract]
Unrecognized compensation cost	$ 7,040
Weighted average period	1 year 5 months 5 days
Weighted average forfeiture rate	33.00%	18.00%
Board of Directors approved equity awards	Mar. 07, 2012
Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	181
Grant date fair value	$ 10.02
RSUs cliff vest	Dec. 31, 2014
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	362
Grant date fair value	$ 13.78