Shareholders' Equity (Details) (USD $)	0 Months Ended		3 Months Ended	6 Months Ended
	May 25, 2011	Feb. 22, 2011	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Shareholders' Equity [Abstract]
Shareholder's plan, expiration date				Jan. 31, 2012
Authorized repurchase of common stock, amount	$ 20,000,000	$ 15,000,000
Repurchase of common stock, shares			467,000	104,000	2,051,000
Repurchase of common stock, net			$ 2,377,000	$ 213,000	$ 13,049,000