Benefit Plans Share Option Activity (Details) (Share Options [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares Outstanding, Beginning of Period	3,480,080	3,888,281	4,389,605
Weighted-Average Exercise Price Per Share Outstanding, Beginning of Period	$ 6.44	$ 6.36	$ 6.23
Number of Shares Exercised	(1,519,179)	(408,201)	(501,324)
Weighed-Average Exercise Price Per Share Exercised	$ 5.77	$ 5.73	$ 5.16
Number of Shares Forfeited	(5,200)
Weighed-Average Exercise Price Per Share Forfeited	$ 7.47
Number of Shares Outstanding, End of Period	1,955,701	3,480,080	3,888,281
Weighted-Average Exercise Price Per Share Outstanding, End of Period	$ 6.95	$ 6.44	$ 6.36