Equity Transactions and Stock-Based Compensation Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended						6 Months Ended				12 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	May 18, 2012	Jun. 30, 2014 Restricted Stock Units (RSUs) [Member]	Jun. 30, 2013 Restricted Stock Units (RSUs) [Member] Time-Based RSUs [Member]	Jun. 30, 2014 Restricted Stock Units (RSUs) [Member] Time-Based RSUs [Member]	Jun. 30, 2013 Restricted Stock Units (RSUs) [Member] Time-Based RSUs [Member]	Jun. 30, 2013 Restricted Stock Units (RSUs) [Member] Performance-Based RSUs [Member]	Jun. 30, 2014 Restricted Stock Units (RSUs) [Member] Performance-Based RSUs [Member]	Jun. 30, 2013 Restricted Stock Units (RSUs) [Member] Performance-Based RSUs [Member]	Jun. 30, 2014 Restricted Stock Units (RSUs) [Member] Performance-Based RSUs, 2011 [Member]	Jun. 30, 2012 Restricted Stock Units (RSUs) [Member] Performance-Based RSUs, 2011 [Member]	Jun. 30, 2013 Restricted Stock Units (RSUs) [Member] Performance-Based RSUs, 2012 [Member]	Jun. 30, 2014 Restricted Stock Units (RSUs) [Member] Performance-Based RSUs, 2012 [Member]	Jun. 30, 2014 Restricted Stock Units (RSUs) [Member] Performance-Based RSUs, 2013 [Member]	Jun. 30, 2014 Restricted Stock Units (RSUs) [Member] Performance-Based RSUs, 2014 [Member]	Jun. 30, 2014 Restricted Stock [Member]	Jun. 30, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Jun. 30, 2014 Stock Options [Member]	Jun. 30, 2013 Stock Options [Member]
Class of Stock [Line Items]
Registration Statement, Stated Maximum Amount Available for Equity or Debt Offerings	$ 300		$ 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	168,500	104,500	215,400	162,867
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 7.74	$ 4.73	$ 7.34	$ 4.84
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period						0	252,749	347,335	406,027	295,873	321,606	346,731							32,100	61,248
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value							$ 7.54	$ 8.44	$ 7.59	$ 8.33	$ 9.90	$ 8.34							$ 14.33	$ 7.57
Performance-based RSU performance period													3 years					3 years
Share-based Compensation Arrangement by Share-based Payment Award, Estimated Achievement Level, Percentage																125.00%	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