Restatement of Previously Issued Fiancial Statements (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Other Restatement Adjustments [Member]	Jun. 30, 2011 Other Restatement Adjustments [Member]
Reclassification to contra-revenue	$ 42,713	$ 42,030	$ 114,755	$ 109,800		$ (2,600)
Decrease in income tax provision	$ 416	$ 922	$ 1,849	$ 1,221	$ (54)