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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