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Income Taxes - Narrative (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2016 $ / shares | Dec. 31, 2017 USD ($) $ / shares | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) $ / shares | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock distribution ratio | 5 |  |  |  |  |  |  |  |  |  |  |
Common stock dividend paid in lieu of fractional shares (usd per share) | $ / shares |  | $ 1.48 |  |  |  | $ 8.265 |  |  |  | $ 1.48 | $ 8.265 | $ 2.26
Income (loss) before income taxes |  | $ (50,957,000) | $ (12,263,000) | $ 18,874,000 | $ 454,746,000 | $ 67,530,000 | $ 47,453,000 | $ 196,352,000 | $ 55,949,000 | $ 410,400,000 | $ 367,284,000 | $ 136,271,000
Tax expense recorded from Tax Cuts and Jobs Act |  | 17,000,000 |  |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  | $ 53,000,000 | 0 | 48,181,000 | 796,000
Net operating loss carryforward |  | 10,720,000 |  |  |  | 8,784,000 |  |  |  | 10,720,000 | 8,784,000 | 3,703,000
Amount that tax basis of net assets is less than reported amounts |  | 1,700,000,000 |  |  |  | $ 2,000,000,000 |  |  |  | 1,700,000,000 | 2,000,000,000 | 6,500,000,000
UK |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  | (4,000,000) | (4,000,000) | (15,000,000)
QCP |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share price (usd per share) | $ / shares | $ 30.85 |  |  |  |  |  |  |  |  |  |  |
TRS |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  | (58,000,000) | $ (9,000,000) | $ (22,000,000)
Net operating loss carryforward |  | $ 42,000,000 |  |  |  |  |  |  |  | $ 42,000,000 |  |

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