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Equity - Convertible Preferred Stock Table (Details) - shares	9 Months Ended
	Sep. 30, 2016	Sep. 30, 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
5.75% 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	1,497,000
Preferred stock, shares outstanding, end of period	1,472,000
Preferred stock, shares outstanding, beginning and end of period	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]
Preferred stock, shares outstanding, beginning of period		1,497,000
Conversion of Stock, Shares Converted	24,601
Preferred stock, shares outstanding, end of period		1,497,000
Preferred stock, shares outstanding, beginning and end of period		1,497,000
Preferred Stock, Dividend Rate, Percentage	5.75%
5.75% Cumulative Convertible Preferred Stock [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Stock Issued During Period, Shares, Conversion of Convertible Securities	975,488
5.75% Cumulative Convertible Preferred Stock Series A [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	1,100,000
Preferred stock, shares outstanding, end of period	1,099,000
Preferred stock, shares outstanding, beginning and end of period	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]
Preferred stock, shares outstanding, beginning of period		1,100,000
Conversion of Stock, Shares Converted	1,201
Preferred stock, shares outstanding, end of period		1,100,000
Preferred stock, shares outstanding, beginning and end of period		1,100,000
Preferred Stock, Dividend Rate, Percentage	5.75%
5.75% Cumulative Convertible Preferred Stock Series A [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Stock Issued During Period, Shares, Conversion of Convertible Securities	46,018
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
Preferred stock, shares outstanding, end of period	2,559,000
Preferred stock, shares outstanding, beginning and end of period	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]
Preferred stock, shares outstanding, beginning of period		2,559,000
Conversion of Stock, Shares Converted	0
Preferred stock, shares outstanding, end of period		2,559,000
Preferred stock, shares outstanding, beginning and end of period		2,559,000
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
Preferred stock, shares outstanding, end of period	2,096,000
Preferred stock, shares outstanding, beginning and end of period	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]
Preferred stock, shares outstanding, beginning of period		2,096,000
Conversion of Stock, Shares Converted	0
Preferred stock, shares outstanding, end of period		2,096,000
Preferred stock, shares outstanding, beginning and end of period		2,096,000

X

- 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

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+ References

No definition available.

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+ 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

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- Definition

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+ References

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-Name Accounting Standards Codification
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