Legal Proceedings (Textual) (Details) (USD $)	3 Months Ended				3 Months Ended				3 Months Ended
	Jun. 30, 2011	Mar. 31, 2012 SEC Penalties Settlement [Member]	Mar. 31, 2011 SEC Penalties Settlement [Member]	Jan. 31, 2011 SEC Penalties Settlement [Member]	Mar. 31, 2012 DOJ Penalties Settlement [Member]	Mar. 31, 2011 DOJ Penalties Settlement [Member]	Dec. 31, 2012 DOJ Penalties Settlement [Member]	Jan. 31, 2011 DOJ Penalties Settlement [Member]	Dec. 31, 2012 Customer Bankruptcy [Member]	Sep. 30, 2012 Customer Bankruptcy [Member]	Jan. 31, 2011 Customer Bankruptcy [Member]
Loss Contingencies [Line Items]
Total settlement consideration				$ 6,400,000				$ 8,000,000	$ 525,000
Payments for legal settlements		3,200,000	3,200,000		2,300,000	3,500,000
Accrual for settlement payments							2,300,000			750,000
Estimated payments for legal settlements, next fiscal year							2,300,000
Settlement offer under customer bankruptcy claim									750,000		250,000
Decrease in settlement accrual under customer bankruptcy claim	$ 2,600,000								$ 225,000