Equity (Stock-Based Compensation Plans - Narrative) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013 Performance_Factor
Performance Shares [Member]
Equity - Stock-based Compensation Plans [Line Items]
Vesting period		3 years
Performance Factor		0.80
Vested in period		1,544,120
Issued in period	1,235,296
Performance Shares [Member] | Minimum [Member]
Equity - Stock-based Compensation Plans [Line Items]
Performance Factor		0.00
Future Performance Factor	0.00
Performance Shares [Member] | Maximum [Member]
Equity - Stock-based Compensation Plans [Line Items]
Performance Factor		2.00
Future Performance Factor	1.75
Performance Units [Member]
Equity - Stock-based Compensation Plans [Line Items]
Vesting period		3 years
Performance Factor		0.80
Vested in period		98,060
Paid in period	78,448
Performance Units [Member] | Minimum [Member]
Equity - Stock-based Compensation Plans [Line Items]
Performance Factor		0.00
Future Performance Factor	0.00
Performance Units [Member] | Maximum [Member]
Equity - Stock-based Compensation Plans [Line Items]
Performance Factor		2.00
Future Performance Factor	1.75