Equity Transactions and Stock-Based Compensation Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			3 Months Ended								3 Months Ended				12 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	May 18, 2012	Mar. 31, 2014 Restricted Stock Units (RSUs) [Member] Time-Based RSUs [Member]	Mar. 31, 2013 Restricted Stock Units (RSUs) [Member] Time-Based RSUs [Member]	Mar. 31, 2014 Restricted Stock Units (RSUs) [Member] Performance-Based RSUs [Member]	Mar. 31, 2013 Restricted Stock Units (RSUs) [Member] Performance-Based RSUs [Member]	Mar. 31, 2014 Restricted Stock Units (RSUs) [Member] Performance-Based RSUs, 2011 [Member]	Mar. 31, 2012 Restricted Stock Units (RSUs) [Member] Performance-Based RSUs, 2011 [Member]	Mar. 31, 2013 Restricted Stock Units (RSUs) [Member] Performance-Based RSUs, 2012 [Member]	Mar. 31, 2014 Restricted Stock Units (RSUs) [Member] Performance-Based RSUs, 2012 [Member]	Mar. 31, 2014 Restricted Stock Units (RSUs) [Member] Performance-Based RSUs, 2013 [Member]	Mar. 31, 2014 Restricted Stock Units (RSUs) [Member] Performance-Based RSUs, 2014 [Member]	Mar. 31, 2014 Restricted Stock [Member]	Mar. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Mar. 31, 2014 Stock Options [Member]	Mar. 31, 2013 Stock Options [Member]
Class of Stock [Line Items]
Registration Statement, Stated Maximum Amount Available for Equity or Debt Offerings	$ 300		$ 300
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross																	221,440	220,656
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				3 years					39 months	39 months		39 months	39 months		1 year	3 years	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period																	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	46,900	58,367
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 5.90	$ 5.05
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				347,335	153,278	321,606	50,858							0	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 8.44	$ 7.66	$ 9.90	$ 8.34
Performance-based RSU performance period								3 years					3 years
Share-based Compensation Arrangement by Share-based Payment Award, Estimated Achievement Level, Percentage											110.00%	100.00%	100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Basis for Determining Award on Market Factors, Percentage									33.33%	33.33%		33.33%	50.00%
Share-based Compensation Arrangement by Share-based Payment Award Basis for Determining Award on Individual Performance Factors Percentage									66.67%	66.67%		66.67%	50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Grants in Period, Weighted Average Grant Date Price																	$ 4.87	$ 4.36