Stock Repurchase Program (Details Textual) (USD $) Share data in Thousands, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2007	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2008	Sep. 09, 2011
Stock Repurchase Program (Textual) [Abstract]
Stock Repurchase Program	$ 5,000,000			$ 3,900,000		$ 13,500,000	$ 8,500,000
Additional authorized amount stock repurchase program								5,000,000
Repurchase of shares common stock		118	0	187	0
Aggregate purchase price common stock Shares		$ 468,000		$ 710,000