CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Common shares, par value	$ 0.10	$ 0.10
Common shares, shares authorized	300,000,000	300,000,000
Common shares, shares issued	211,286,874	193,995,499
Treasury at cost	287,645	898,267
Class A Cumulative Redeemable Preferred Shares [Member]
Cumulative redeemable preferred shares, liquidation value	$ 500	$ 500
Cumulative redeemable preferred shares, shares authorized	750,000	750,000
Cumulative redeemable preferred shares, shares issued	350,000	350,000
Cumulative redeemable preferred shares, shares outstanding	350,000	350,000
Preferred stock dividend rate	6.375%	6.375%
Cumulative redeemable preferred shares, par value
Class K Cumulative Redeemable Preferred Shares [Member]
Cumulative redeemable preferred shares, liquidation value		$ 500
Cumulative redeemable preferred shares, shares authorized	750,000	750,000
Cumulative redeemable preferred shares, shares issued		300,000
Cumulative redeemable preferred shares, shares outstanding		300,000
Preferred stock dividend rate		6.25%
Cumulative redeemable preferred shares, par value

Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Face amount per share of no-par value preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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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.

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Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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