Subsequent Event (Narrative) (Details) (USD $)	1 Months Ended		12 Months Ended		3 Months Ended
	Nov. 30, 2012	Oct. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Mar. 27, 2013 Subsequent Event [Member]	Mar. 31, 2013 Subsequent Event [Member]
Subsequent Event [Line Items]
Stock repurchased and retired, shares			4,709,000	781,000	502,400	502,400
Stock repurchased and retired, value			$ 24,836,000	$ 3,495,000		$ 2,500,000
Amount available for future share repurchase						9,900,000
Share repurchase program, amount authorized	$ 40,500,000	$ 20,000,000				$ 40,500,000