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Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 15, 2015 | Mar. 31, 2015 | Mar. 13, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividends declared per common share, in usd per share |  |  |  |  | $ 0.3 | $ 0.29 | $ 0.6 | $ 0.58
Dividends declared and paid, Preference shares |  |  |  |  | $ 5,596 | $ 5,596 | $ 11,191 | $ 11,191
Retained Earnings |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividends declared and paid, Preference shares |  |  |  |  |  |  | 11,191 | 11,191
Dividends declared and paid, Common shares |  |  |  |  |  |  | 27,479 | 23,550
Common shares repurchased during period, Aggregate amount |  |  |  |  |  |  | $ 0 | $ 313,312
Common Shares |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividends declared per common share, in usd per share |  | $ 0.3 |  | $ 0.30 |  |  |  |
Dividends per common share, in usd per share | $ 0.3 |  | $ 0.3 |  |  |  |  |
Common shares repurchased during period, Number of shares |  |  |  |  |  |  | 83 |
Common shares repurchased during period, Aggregate amount |  |  |  |  |  |  | $ 8,400 |
Common shares repurchased during period, Average cost per share |  |  |  |  |  |  | $ 101.99 |
Share repurchase program, Remaining authorized aggregate amount | $ 491,900 |  |  |  | $ 491,900 |  | $ 491,900 |

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