Stock Repurchase Program (Details Textual) (USD $) Share data in Thousands, unless otherwise specified	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Dec. 31, 2007	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2008
Stock Repurchase Program (Textual) [Abstract]
Stock Repurchase Program	$ 16,100,000	$ 5,000,000			$ 5,000,000		$ 13,500,000
Additional authorized amount stock repurchase program	2,600,000		2,600,000		2,600,000
Stock repurchase program expire date					Sep. 21, 2012
Repurchase of shares common stock			380	1,200	568	1,200
Aggregate purchase price common stock Shares			$ 1,500,000	$ 3,100,000	$ 2,164,000	$ 3,089,000