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SHAREHOLDERS' EQUITY - Preferred shares (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 27, 2016 | Nov. 30, 2016 | May 31, 2013 | Apr. 30, 2012 | Mar. 31, 2012 | Nov. 30, 2005 | Feb. 28, 2019 | Feb. 28, 2018 | Feb. 24, 2017 | Nov. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 17, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash payment to acquire preferred shares |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 351,074 | $ 51,769 |
Loss on repurchase of preferred shares |  |  |  |  |  |  |  |  |  |  | 0 | 0 | $ 1,309 |
Preferred shares, aggregate liquidation value outstanding |  |  |  |  |  |  |  |  |  |  | $ 775,000 | $ 775,000 |  |
Series B 7.50% Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, aggregate liquidation value issued |  |  |  |  |  | $ 250,000 |  |  |  |  |  |  |  |
Preferred shares, dividend rate |  |  |  |  |  |  |  |  |  |  | 7.50% |  |  |
Preferred shares, par value per share (in usd per share) |  |  |  |  |  |  |  |  |  |  | $ 0.0125 |  |  |
Preferred shares, liquidation preference per share (in usd per share) |  |  |  |  |  |  |  |  |  |  | 100 |  |  |
Preferred shares, redemption price per share (in usd per share) |  |  |  |  |  |  |  |  |  |  | $ 100.00 |  |  |
Preferred shares, purchase price per share (in usd per share) |  |  |  | $ 102.81 |  |  |  |  |  |  |  |  |  |
Preferred shares, number of shares redeemed (in shares) | 28,430 |  |  | 2,471,570 |  |  |  |  |  |  |  |  |  |
Aggregate cash payment to acquire preferred shares |  |  |  | $ 254,000 |  |  |  |  |  |  |  |  |  |
Loss on repurchase of preferred shares |  |  |  | $ 9,000 |  |  |  |  |  |  |  |  |  |
Preferred shares, aggregate redemption price | $ 3,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Series C 6.875% Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, aggregate liquidation value issued |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |
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 |  |  |
Preferred shares, redemption price per share (in usd per share) |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |
Preferred shares, purchase price per share (in usd per share) |  | $ 25.67 |  |  |  |  |  |  |  | $ 25.67 |  |  |  |
Preferred shares, number of shares redeemed (in shares) |  |  |  |  |  |  |  |  |  | 1,957,045 |  |  |  |
Aggregate cash payment to acquire preferred shares |  |  |  |  |  |  |  |  |  | $ 50,000 |  |  |  |
Loss on repurchase of preferred shares |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |
Preferred shares, dividend declared per share (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.4297 | $ 1.7188 |
Preferred shares, dividends paid per share (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | 0.4297 | 1.7188 |
Preferred shares, number of shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,042,955
Preferred shares, aggregate liquidation value outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 351,000
Series D 5.50% Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, aggregate liquidation value issued |  |  | $ 225,000 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |
Preferred shares, redemption price per share (in usd per share) |  |  |  |  |  |  |  |  |  |  | 25 |  |  |
Preferred shares, dividend declared per share (in usd per share) |  |  |  |  |  |  |  |  |  |  | 1.3750 | 1.3750 | 1.3750 |
Preferred shares, dividends paid per share (in usd per share) |  |  |  |  |  |  |  | $ 0.34375 |  |  | $ 1.0313 | 1.0313 | 1.3750 |
Series E 5.50% Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, aggregate liquidation value issued |  | $ 550,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |
Preferred shares, dividend declared per share (in usd per share) |  |  |  |  |  |  |  |  |  |  | 137.50 | 137.50 | $ 34.375 |
Preferred shares, dividends paid per share (in usd per share) |  |  |  |  |  |  |  | $ 34.3750 | $ 34.375 |  | $ 103.13 | $ 103.13 |  |
Subsequent Event | Series D 5.50% Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, dividends paid per share (in usd per share) |  |  |  |  |  |  | $ 0.34375 |  |  |  |  |  |  |
Subsequent Event | Series E 5.50% Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, dividend declared per share (in usd per share) |  |  |  |  |  |  | $ 34.375 |  |  |  |  |  |  |

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