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Equity - Narrative (Details)
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6 Months Ended |
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Jun. 30, 2014
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5.0% Cumulative Convertible Preferred Stock Series Two Thousand And Five B [Member]
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| Schedule of Capitalization, Equity [Line Items] | |
| Preferred Stock, Dividend Rate, Percentage | 5.00% |
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4.50% Cumulative Convertible Preferred Stock [Member]
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| Schedule of Capitalization, Equity [Line Items] | |
| Preferred Stock, Dividend Rate, Percentage | 4.50% |
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5.75% Cumulative Convertible Preferred Stock [Member]
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| Schedule of Capitalization, Equity [Line Items] | |
| Preferred Stock, Dividend Rate, Percentage | 5.75% |