Share-Based Compensation Plans Share-Based Compensation Plans - Stock Option Activity (Details) (Stock Options, USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares outstanding, beginning of period	201	354	360
Shares granted	0	0	0
Shares exercised	(7)	(153)	(6)
Shares cancelled/forfeited	(1)	0	0
Shares outstanding, end of period	193	201	354
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Shares outstanding, weighted average exercise price, beginning of period	$ 36.30	$ 36.52	$ 36.36
Shares granted, weighted average exercise price	$ 0	$ 0.00	$ 0.00
Shares exercised, weighted average exercise price	$ 42.94	$ 36.80	$ 27.23
Shares cancelled/forfeited, weighted average exercise price	$ 36.12	$ 0.00	$ 0.00
Shares outstanding, weighted average exercise price, end of period	$ 36.04	$ 36.30	$ 36.52