v3.3.1.900

Shareholders' Equity - Narrative (Details) |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 25, 2015 USD ($) director $ / shares shares | Mar. 05, 2015 $ / shares shares | Feb. 19, 2015 $ / shares shares | Jan. 01, 2015 $ / shares shares | Feb. 19, 2014 $ / shares shares | Aug. 22, 2012 USD ($) director $ / shares shares | Oct. 31, 2013 USD ($) director $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) shares | Jul. 24, 2014 USD ($) | Dec. 31, 2012 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) | shares |  |  |  |  |  |  |  | 150,000,000 |  |  |  |
Common shares, shares issued (in shares) | shares |  |  |  |  |  |  |  | 74,735,785 | 73,900,889 |  |  |
Common shares, shares outstanding (in shares) | shares |  |  |  |  |  |  |  | 73,721,140 | 72,932,702 | 72,633,561 |  | 72,343,947
Preference shares issued (in shares) | shares |  |  |  |  |  |  |  | 15,900,000 |  |  |  |
Shares undesignated (in shares) | shares |  |  |  |  |  |  |  | 59,364,215 |  |  |  |
Common shares, par value (in dollars per share) |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  |
Number of shares issued (in shares) | shares |  |  |  |  |  |  |  | 378,120 | 184,396 | 0 |  |
Proceeds from issuance of Preference Shares | $ |  |  |  |  |  |  |  | $ 159,628,000 | $ 0 | $ 159,675,000 |  |
Preferred Stock, number of Directors contingently electable | director | 2 |  |  |  |  | 2 |  |  |  |  |  |
Preferred Stock, dividend default period |  |  |  |  |  | six or more dividend periods |  |  |  |  |  |
Shares repurchased (in shares) | shares |  | 33,846 | 7,658 | 4,954 | 5,851 |  |  | 46,458 | 5,851 | 0 |  |
Shares repurchased, price per share |  | $ 14.21 | $ 14.40 | $ 12.79 | $ 11.18 |  |  |  |  |  |  |
Preference Shares - Series C |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | shares | 6,600,000 |  |  |  |  |  |  |  |  |  |  |
Dividend rate of Preference Shares | 7.125% |  |  |  |  |  |  |  |  |  |  |
Par value of Preference Shares (in dollars per share) | $ 0.01 |  |  |  |  |  |  |  |  |  |  |
Fair value of share (in dollars per share) | $ 25 |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of Preference Shares | $ | $ 159,628,000 |  |  |  |  |  |  |  |  |  |  |
Expenses and underwriting discounts | $ | $ 5,372,000 |  |  |  |  |  |  |  |  |  |  |
Redemption price for Preference Shares (in dollars per share) | $ 25 |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) | shares | 6,600,000 |  |  |  |  |  |  |  |  |  |  |
Sale price of Preference Shares (in dollars per share) | $ 25 |  |  |  |  |  |  |  |  |  |  |
Mandatory Convertible Preference Shares - Series B |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preference shares offered (in shares) | shares |  |  |  |  |  |  | 3,300,000 |  |  |  |  |
Dividend rate of Preference Shares |  |  |  |  |  |  | 7.25% |  |  |  |  |
Par value of Preference Shares (in dollars per share) |  |  |  |  |  |  | $ 0.01 |  |  |  |  |
Fair value of share (in dollars per share) |  |  |  |  |  |  | $ 50 |  |  |  |  |
Proceeds from issuance of Preference Shares | $ |  |  |  |  |  |  | $ 159,675,000 |  |  |  |  |
Expenses and underwriting discounts | $ |  |  |  |  |  |  | $ 5,325,000 |  |  |  |  |
Shares authorized (in shares) | shares |  |  |  |  |  |  | 3,300,000 |  |  |  |  |
Sale price of Preference Shares (in dollars per share) |  |  |  |  |  |  | $ 50 |  |  |  |  |
Liquidation preference per share per annum (in dollars per share) |  |  |  |  |  |  | 3.625 |  |  |  |  |
Liquidation preference per share per quarter (in dollars per share) |  |  |  |  |  |  | 0.90625 |  |  |  |  |
Liquidation preference per share in initial quarter (in dollars per share) |  |  |  |  |  |  | $ 0.745139 |  |  |  |  |
Convertible Preferred Stock, conversion rate measurement period |  |  |  |  |  |  | 40 days |  |  |  |  |
Preferred Stock, dividend rate (in dollars per share) |  |  |  |  |  |  | $ 0.09 |  |  |  |  |
Dividends on preference shares | $ |  |  |  |  |  |  |  | $ 11,962,000 | $ 11,962,000 | $ 2,459,000 |  |
Preference shares - Series A |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | shares |  |  |  |  |  | 6,000,000 |  |  |  |  |  |
Dividend rate of Preference Shares |  |  |  |  |  | 8.25% |  |  |  |  |  |
Par value of Preference Shares (in dollars per share) |  |  |  |  |  | $ 0.01 |  |  |  |  |  |
Fair value of share (in dollars per share) |  |  |  |  |  | $ 25 |  |  |  |  |  |
Proceeds from issuance of Preference Shares | $ |  |  |  |  |  | $ 145,041,000 |  |  |  |  |  |
Expenses and underwriting discounts | $ |  |  |  |  |  | $ 4,959,000 |  |  |  |  |  |
Redemption price for Preference Shares (in dollars per share) |  |  |  |  |  | $ 25 |  |  |  |  |  |
Shares authorized (in shares) | shares |  |  |  |  |  | 6,000,000 |  |  |  |  |  |
Sale price of Preference Shares (in dollars per share) |  |  |  |  |  | $ 25 |  |  |  |  |  |
Dividends on preference shares | $ |  |  |  |  |  |  |  | $ 12,375,000 | $ 12,375,000 | $ 12,375,000 |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount of share repurchase program | $ |  |  |  |  |  |  |  |  |  |  | $ 75,000,000 |
Maximum | Mandatory Convertible Preference Shares - Series B |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, shares issued upon conversion ratio |  |  |  |  |  |  | 4.0322 |  |  |  |  |
Preferred Stock, number of electable board members | director |  |  |  |  |  |  | 2 |  |  |  |  |
Minimum | Mandatory Convertible Preference Shares - Series B |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, shares issued upon conversion ratio |  |  |  |  |  |  | 3.2258 |  |  |  |  |

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