Basis of Presentation Share-based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	142,178	130,502	1,114,660	937,833
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards other than options, vested	0	0	159,228	229,730
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Exercised	11,655	108,477	256,768	159,611
Share-based comp Options Granted Weighted average exercise price	$ 17.40	$ 7.13	$ 10.49	$ 8.39
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards other than options, vested	130,523	22,025	698,664	548,492