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Equity - Convertible Preferred Stock Table (Details) - shares | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |
Preferred stock, shares outstanding, beginning of period | 7,251,515 |
Preferred stock, shares outstanding, end of period | 7,225,713 |
Preferred stock, shares outstanding, beginning and end of period | 7,251,515 |
Preferred Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |
Conversion of Stock, Shares Converted | 25,802 | 0
5.75% Cumulative Convertible Preferred Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Preferred Stock, Dividend Rate, Percentage | 5.75% |
Stock Issued During Period, Shares, Conversion of Convertible Securities | 975,488 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |
Preferred stock, shares outstanding, beginning of period | 1,497,000 | 1,497,000
Preferred stock, shares outstanding, end of period | 1,472,000 | 1,497,000
Preferred stock, shares outstanding, beginning and end of period | 1,497,000 | 1,497,000
5.75% Cumulative Convertible Preferred Stock [Member] | Preferred Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |
Conversion of Stock, Shares Converted | 25,000 |
5.75% Cumulative Convertible Preferred Stock Series A [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Preferred Stock, Dividend Rate, Percentage | 5.75% |
Stock Issued During Period, Shares, Conversion of Convertible Securities | 46,018 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |
Preferred stock, shares outstanding, beginning of period | 1,100,000 | 1,100,000
Preferred stock, shares outstanding, end of period | 1,099,000 | 1,100,000
Preferred stock, shares outstanding, beginning and end of period | 1,100,000 | 1,100,000
5.75% Cumulative Convertible Preferred Stock Series A [Member] | Preferred Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |
Conversion of Stock, Shares Converted | 1,000 |
4.50% Cumulative Convertible Preferred Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |
Preferred stock, shares outstanding, beginning of period | 2,559,000 | 2,559,000
Preferred stock, shares outstanding, end of period | 2,559,000 | 2,559,000
Preferred stock, shares outstanding, beginning and end of period | 2,559,000 | 2,559,000
4.50% Cumulative Convertible Preferred Stock [Member] | Preferred Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |
Conversion of Stock, Shares Converted | 0 |
5.0% Cumulative Convertible Preferred Stock Series 2005 B [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |
Preferred stock, shares outstanding, beginning of period | 2,096,000 | 2,096,000
Preferred stock, shares outstanding, end of period | 2,096,000 | 2,096,000
Preferred stock, shares outstanding, beginning and end of period | 2,096,000 | 2,096,000
5.0% Cumulative Convertible Preferred Stock Series 2005 B [Member] | Preferred Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |
Conversion of Stock, Shares Converted | 0 |

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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 + Details
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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of shares issued during the period as a result of the conversion of convertible securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 + Details
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