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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 01, 2019 | Jul. 26, 2019 | Jul. 02, 2019 | May 01, 2019 | Apr. 24, 2019 | Apr. 02, 2019 | Feb. 22, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | May 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares, shares issued |  |  |  |  |  |  |  | 416,282,000 |  |  | 416,282,000 |  | 416,282,000 |  | 409,652,000
Proceeds from issuance of common shares, net of issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 302,014 |
Total aggregate amount of shares purchased |  |  |  |  |  |  |  | $ 80 |  |  | $ 79 |  | $ 79 |  |
Dividends to shareholders (in dollars per share) |  | $ 0.01 |  |  | $ 0.01 |  | $ 0.01 |  |  |  | $ 0.01 | $ 0.06 | $ 0.02 | $ 0.12 |
Cash dividends paid |  |  | $ 3,500 |  |  | $ 3,500 |  |  |  |  |  |  |  |  |
Preferred shares, shares issued |  |  |  |  |  |  |  | 5,746,000 |  |  | 5,746,000 |  | 5,746,000 |  | 5,750,000
Preferred stock, rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  | 6.00%
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  |  | $ 0.001 |  |  | $ 0.001 |  | $ 0.001 |  | $ 0.001
Preferred stock, liquidation preference (in dollars per share) |  |  |  |  |  |  |  | $ 50 |  |  | 50 |  | 50 |  | $ 50
Aggregate net proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 278,573 |
Cash dividend per mandatory convertible preferred shares (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.75 | $ 0.64 | $ 1.50 |  |
Mandatory Convertible Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased |  |  |  |  |  |  |  | 4,000 |  |  |  |  |  |  |
Preferred shares, shares issued |  |  |  |  |  |  |  |  |  | 5,750,000 |  |  |  |  |
Preferred stock, rate (as a percent) |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.001 |  |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 50 |  |  |  |  |
Cash dividend per mandatory convertible preferred shares (in dollars per share) |  | $ 0.75 |  |  | $ 0.75 |  | $ 0.75 |  |  |  |  |  |  |  |
Mandatory Convertible Preferred Shares | Underwriters option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares, shares issued |  |  |  |  |  |  |  |  |  | 750,000 |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares, shares issued |  |  |  |  |  |  |  |  |  | 35,000,000 |  |  |  |  |
Share price of shares purchased (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 7.75 |  |  |  |  |
Proceeds from issuance of common shares, net of issuance costs |  |  |  |  |  |  |  |  | $ 301,400 |  |  |  |  |  |
Number of consecutive trading days to calculate average share price of common stock |  |  |  |  |  |  |  |  |  | 20 days |  |  |  |  |
Common Shares | Underwriters option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares, shares issued |  |  |  |  |  |  |  |  | 5,250,000 |  |  | 5,250,000 |  | 5,250,000 |
Common Shares | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  |  | 5.6179 |  | 5.3763 | 5.6179 |  | 5.6179 |  |
Common Shares | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  |  | 6.7416 |  | 6.4516 | 6.7416 |  | 6.7416 |  |
Common Shares | Mandatory Convertible Preferred Shares | Underwriters option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate net proceeds |  |  |  |  |  |  |  |  |  | $ 277,900 |  |  |  |  |
Retained Earnings | Mandatory Convertible Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid | $ 4,300 |  |  | $ 4,300 |  |  |  |  |  |  |  |  |  |  |

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