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SHAREHOLDERS' EQUITY - Preferred shares (Details) - USD ($) |  |  |  |  | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 17, 2020 | Nov. 07, 2016 | May 20, 2013 | Mar. 19, 2012 | Nov. 30, 2016 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Apr. 17, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Aggregate cash payment to acquire preferred shares |  |  |  |  |  | $ 0 | $ 0 | $ 351,074,000 |
Preferred shares, aggregate liquidation value outstanding |  |  |  |  |  | $ 775,000,000 | $ 775,000,000 |  |
Series C 6.875% Preferred Shares |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred shares, aggregate liquidation value issued |  |  |  | $ 400,000,000 |  |  |  |  |
Preferred shares, dividend rate |  |  |  | 6.875% |  |  |  |  |
Preferred shares, par value per share (in usd per share) |  |  |  | $ 0.0125 |  |  |  |  |
Preferred shares, liquidation preference per share (in usd per share) |  |  |  | 25.00 |  |  |  |  |
Preferred shares, redemption price per share (in usd per share) |  |  |  | $ 25.00 |  |  |  |  |
Preferred shares, number of shares redeemed (in shares) |  |  |  |  | 1,957,045 |  |  |  |
Preferred shares, purchase price per share (in usd per share) |  |  |  |  | $ 25.67 |  |  |  |
Aggregate cash payment to acquire preferred shares |  |  |  |  | $ 50,000,000 |  |  |  |
Loss on repurchase of preferred shares |  |  |  |  | $ 1,000,000 |  |  |  |
Preferred shares, number of shares outstanding (in shares) |  |  |  |  |  |  |  |  | 14,042,955
Preferred shares, aggregate liquidation value outstanding |  |  |  |  |  |  |  |  | $ 351,000,000
Series D 5.50% Preferred Shares |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred shares, aggregate liquidation value issued |  |  | $ 225,000,000 |  |  |  |  |  |
Preferred shares, dividend rate |  |  | 5.50% |  |  |  |  |  |
Preferred shares, par value per share (in usd per share) |  |  | $ 0.0125 |  |  |  |  |  |
Preferred shares, liquidation preference per share (in usd per share) |  |  | 25.00 |  |  |  |  |  |
Preferred shares, redemption price per share (in usd per share) |  |  | $ 25.00 |  |  |  |  |  |
Series E 5.50% Preferred Shares |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred shares, aggregate liquidation value issued |  | $ 550,000,000 |  |  |  |  |  |  |
Preferred shares, dividend rate |  | 5.50% |  |  |  |  |  |  |
Preferred shares, par value per share (in usd per share) |  | $ 0.0125 |  |  |  |  |  |  |
Preferred shares, liquidation preference per share (in usd per share) |  | 2,500 |  |  |  |  |  |  |
Preferred shares, redemption price per share (in usd per share) |  | $ 2,500 |  |  |  |  |  |  |
Subsequent event | Series D 5.50% Preferred Shares |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred shares, number of shares redeemed (in shares) | 9,000,000 |  |  |  |  |  |  |  |
Preferred shares, aggregate liquidation value outstanding | $ 225,000,000 |  |  |  |  |  |  |  |

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- Definition The cash outflow, on a per share basis, to reacquire preferred stock during the period. + References No definition available. + Details
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- Definition The cash outflow to reacquire preferred stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 + Details
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- Definition The excess of (1) fair value of the consideration transferred to the holders of the preferred stock over (2) the carrying amount of the preferred stock in the registrant's balance sheet, during the accounting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27010884&loc=d3e42851-122695 + Details
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