Dividends (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended		3 Months Ended
	Dec. 27, 2012	Jul. 26, 2011	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Aug. 24, 2011
Dividends, Common Stock [Abstract]
Acclerated cash dividend per share				$ 0.0425
Payment of accelerated cash dividends	$ 2.5
Board of Directors declared a cash dividend		$ 0.04	$ 0		$ 0.040
Payment to shareholders						$ 2.5