The price of the conversion per share.

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- Definition

Conversion of Stock, Holders Conversion Right

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- Definition

The market value of stock which, if exceeded, triggers the vesting of the company's option to induce conversion.

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Conversion of Stock, Stock Issue Date

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Describe the conversion features of preferred stock if preferred stock is convertible. That is, shares of preferred stock into which another convertible security was converted, or shares of preferred stock into which another class of preferred stock was converted.

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No definition available.

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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.

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No definition available.

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- Definition

Specific terms relevant to convertibility. Includes class of preferred stock and number of shares convertible into, exercise (or conversion) price or rates, dates relevant to conversion timing and events relevant to conversion. Describe also any beneficial conversion features. where convertible preferred stock with a nondetachable conversion feature is in-the-money at commitment date. For contingently convertible preferred stock, discuss the circumstances of the contingency, including the events or changes in circumstance that would cause the contingency to be met and any of the significant features necessary to understand the conversion rights and the timing of those rights. Include also an events or changes in circumstance, if any, that could adjust or change the contingency, conversion price, or number of shares, including significant terms of those changes.

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The percentage rate used to calculate dividend payments on preferred stock.

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The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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Equity - Preferred Stock Conversion Terms (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
5.75% cumulative convertible preferred stock [Member]
Class of Stock [Line Items]
Preferred stock, dividend rate	5.75%	5.75%
5.75% cumulative convertible preferred stock series A [Member]
Class of Stock [Line Items]
Preferred stock, dividend rate	5.75%	5.75%
4.50% cumulative convertible preferred stock [Member]
Class of Stock [Line Items]
Preferred stock, dividend rate	4.50%
5.00% cumulative convertible preferred stock series 2005 B [Member]
Class of Stock [Line Items]
Preferred stock, dividend rate	5.00%	5.00%	5.00%
Preferred stock [Member] \| 5.75% cumulative convertible preferred stock [Member]
Class of Stock [Line Items]
Issue Date	Jun. 01, 2010
Liquidation Preference per Share (in usd per share)	$ 1,000
Holder's Conversion Right	Any time
Conversion Rate	39.6858%
Conversion Price (in usd per share)	$ 25.1979
Company's Conversion Right From	May 17, 2015
Company's Market Conversion Trigger (in usd per share)	$ 32.7573
Preferred stock, dividend rate			5.75%
Preferred stock [Member] \| 5.75% cumulative convertible preferred stock series A [Member]
Class of Stock [Line Items]
Issue Date	May 10, 2010
Liquidation Preference per Share (in usd per share)	$ 1,000
Holder's Conversion Right	Any time
Conversion Rate	38.3508%
Conversion Price (in usd per share)	$ 26.0751
Company's Conversion Right From	May 17, 2015
Company's Market Conversion Trigger (in usd per share)	$ 33.8976
Preferred stock, dividend rate			5.75%
Preferred stock [Member] \| 4.50% cumulative convertible preferred stock [Member]
Class of Stock [Line Items]
Issue Date	Sep. 15, 2005
Liquidation Preference per Share (in usd per share)	$ 100
Holder's Conversion Right	Any time
Conversion Rate	2.4561%
Conversion Price (in usd per share)	$ 40.7152
Company's Conversion Right From	September 15, 2010
Company's Market Conversion Trigger (in usd per share)	$ 52.9298
Preferred stock [Member] \| 5.00% cumulative convertible preferred stock series 2005 B [Member]
Class of Stock [Line Items]
Issue Date	Nov. 15, 2005
Liquidation Preference per Share (in usd per share)	$ 100
Holder's Conversion Right	Any time
Conversion Rate	2.7745%
Conversion Price (in usd per share)	$ 36.0431
Company's Conversion Right From	November 15, 2010
Company's Market Conversion Trigger (in usd per share)	$ 46.8560
Preferred stock [Member] \| Minimum [Member] \| 4.50% or 5.00% (series 2005B) cumulative convertible preferred stock [Member]
Class of Stock [Line Items]
Conversion of stock, market trigger (in shares)	250,000
Preferred stock [Member] \| Minimum [Member] \| 5.75% or 5.75% (Series A) preferred stock [Member]
Class of Stock [Line Items]
Conversion of stock, market trigger (in shares)	25,000