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Shareholders' Equity (Narrative) (Details) |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2018 USD ($) director period $ / shares shares | Dec. 20, 2018 shares | Dec. 14, 2018 $ / shares | Oct. 30, 2018 USD ($) | Sep. 28, 2018 $ / shares | Sep. 14, 2018 $ / shares | Jun. 29, 2018 $ / shares | Jun. 15, 2018 $ / shares | Mar. 29, 2018 $ / shares | Mar. 15, 2018 $ / shares | Jun. 27, 2013 USD ($) shares | Jun. 30, 2018 USD ($) $ / shares shares | May 31, 2013 USD ($) $ / shares shares | Mar. 31, 2004 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) director period $ / shares shares | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) director period $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2013 USD ($) | Nov. 10, 2017 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate authorized shares (in shares) | shares | 325,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 325,000,000 |  |  |  |  |  |  |  | 325,000,000 |  |  |  |
Authorized common shares (in shares) | shares | 225,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 225,000,000 |  |  |  |  |  |  |  | 225,000,000 |  |  |  |
Authorized preference shares (in shares) | shares | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  | 100,000,000 |  |  |  |
Dividends on preference shares | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,189,000 | $ 9,708,000 | $ 5,596,000 | $ 5,595,000 | $ 5,595,000 | $ 5,595,000 | $ 5,596,000 | $ 5,595,000 | $ 30,088,000 | $ 22,381,000 | $ 22,381,000 |  |
Preference shares, issued, value | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 241,448,000 | $ 0 |  |  |
Par value (in usd per share) | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1 |  |  |  | $ 1 |  |  |  | $ 1 | $ 1 |  |  |
Preference shares, shares outstanding (in shares) | shares | 16,010,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,010,000 |  |  |  | 16,000,000 |  |  |  | 16,010,000 | 16,000,000 |  |  |
Shares issued (in shares) | shares | 16,010,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,010,000 |  |  |  | 16,000,000 |  |  |  | 16,010,000 | 16,000,000 |  |  |
Common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,947,000 | 0 | 0 |  |
Common shares | Private Placement | State Farm |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Agreement, shares issued in transaction (in shares) | shares |  | 1,947,496 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Agreement, consideration received per transaction | $ |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on preference shares | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,088,000 | $ 22,381,000 | $ 22,381,000 |  |
Dividends on common shares | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (52,841,000) | $ (51,370,000) | $ (51,583,000) |  |
Common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share (in usd per share) |  |  | $ 0.33 |  |  | $ 0.33 |  | $ 0.33 |  | $ 0.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends paid per common share (in usd per share) | $ 0.33 |  |  |  | $ 0.33 |  | $ 0.33 |  | $ 0.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, authorized aggregate amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Share repurchase program, remaining authorized shares (in shares) | $ | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.08% |  |  |  |
Liquidation preference per annum (in usd per share) | $ 1.52 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.52 |  |  |  |  |  |  |  | $ 1.52 |  |  |  |
Quarterly liquidation preference (in usd per share) | $ 0.38 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.38 |  |  |  |  |  |  |  | $ 0.38 |  |  |  |
Preference shares, issued, value | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Par value (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, shares redeemed (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, redemption amount | $ |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preference shares, shares outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock | $ |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right to elect directors, required number of dividend periods in arrears | period | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  | 6 |  |  |  |
Right to elect directors, number of directors | director | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  | 2 |  |  |  |
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.375% |  |  |  |
Liquidation preference per annum (in usd per share) | $ 1.34375 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.34375 |  |  |  |  |  |  |  | $ 1.34375 |  |  |  |
Quarterly liquidation preference (in usd per share) | 0.3359375 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.3359375 |  |  |  |  |  |  |  | 0.3359375 |  |  |  |
Preference shares, issued, value | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 275,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Preference shares, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value (in usd per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price per share (in usd per share) | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  | $ 25 |  |  |  |
Series F Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  | 5.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidation preference per annum (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 1,437.50 |  |  |  |  | $ 1,437.50 |  |  |  |  |  |  |  |  |  |
Quarterly liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 359.375 |  |  |  |  | $ 359.375 |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 10,000 |  |  |  |  | 10,000 |  |  |  |  |  |  |  |  |  |
Liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |  |
Redemption price per share (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | 25,000 |  |  |  |  | 25,000 |  |  |  |  |  |  |  |  |  |
Depositary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidation preference per annum (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | 1.4375 |  |  |  |  | 1.4375 |  |  |  |  |  |  |  |  |  |
Quarterly liquidation preference (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.359375 |  |  |  |  | $ 0.359375 |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |
Percentage interest in underlying shares |  |  |  |  |  |  |  |  |  |  |  | 0.10% |  |  |  |  | 0.10% |  |  |  |  |  |  |  |  |  |
Redemption price per share (in usd per share) |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |

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