Equity (Stock-Based Compensation Plans - Narrative) (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2013 Performance_Factor	Dec. 31, 2012 Performance_Factor
Performance Shares [Member]
Equity - Stock-based Compensation Plans [Line Items]
Vesting period		3 years
Performance factor lower range		0.0
Performance factor upper range		2.0
Performance factor lower range, future	0.0
Performance factor upper range, future	1.75
Performance Factor		0.92
Vested in period		1,346,025
Issued in period	1,238,343
Performance Units [Member]
Equity - Stock-based Compensation Plans [Line Items]
Vesting period		3 years
Performance factor lower range		0.0
Performance factor upper range		2.0
Performance factor lower range, future	0.0
Performance factor upper range, future	1.75
Performance Factor		0.92
Vested in period		51,650
Paid in period	47,518