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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Common shares, par value | $ 0.10 | $ 0.10
Common shares, shares authorized | 600,000,000 | 600,000,000
Common shares, shares issued | 367,823,362 | 366,298,335
Treasury at cost | 676,419 | 947,893
Class A Cumulative Redeemable Preferred Shares [Member] |  |
Cumulative redeemable preferred shares, liquidation value | $ 500 |
Cumulative redeemable preferred shares, shares authorized | 750,000 |
Cumulative redeemable preferred shares, shares issued | 350,000 |
Cumulative redeemable preferred shares, shares outstanding | 350,000 |
Preferred stock dividend rate | 6.375% |
Cumulative redeemable preferred shares, par value |  |
Class J 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 | 400,000 | 400,000
Cumulative redeemable preferred shares, shares outstanding | 400,000 | 400,000
Preferred stock dividend rate | 6.50% | 6.50%
Cumulative redeemable preferred shares, par value |  |
Class K 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 | 300,000 | 300,000
Cumulative redeemable preferred shares, shares outstanding | 300,000 | 300,000
Preferred stock dividend rate | 6.25% | 6.25%
Cumulative redeemable preferred shares, par value |  |

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: 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=84159872&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21484-112644 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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