Share-Based Compensation Plans Stock Options (Details) (Stock options [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding beginning balance	4,873
Weighted average exercise price per share outstanding beginning balance	$ 6.52
Number of shares granted	260
Weighted average exercise price per share granted	$ 7.64
Number of shares exercised	(747)
Weighted average exercise price per share exercised	$ 6.46
Number of shares forfeited or expired	(340)
Weighted average exercise price per share forfeited or expired	$ 12.30
Number of shares outstanding ending balance	4,046
Weighted average exercise price per share outstanding ending balance	$ 6.12
Weighted average exercise price per share average contractual term (years)	6 years 6 months 29 days
Aggregate intrinsic value outstanding ending balance (in dollars)	$ 20,566
Number of shares fully vested and expected to vest	4,015
Weighted average exercise price per share fully vested and expected to vest	$ 6.13
Weighted average remaining contractual term fully vested and expected to vest (years)	6 years 6 months 22 days
Aggregate intrinsic value fully vested and expected to vest (in dollars)	20,373
Number of shares exercisable	1,955
Weighted average exercise price per share exercisable	$ 7.55
Weighted average remaining contractual term exercisable (years)	3 years 10 months 2 days
Aggregate intrinsic value exercisable (in dollars)	$ 7,197