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Preferred Stock (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 15, 2019 shares | Sep. 30, 2018 USD ($) | Oct. 01, 2017 USD ($) | Sep. 30, 2018 USD ($) | Oct. 01, 2017 USD ($) | Dec. 31, 2016 USD ($) trading_day $ / shares shares
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock dividends | $ |  | $ 8,732 | $ 8,732 | $ 26,198 | $ 26,198 |
Depository Shares |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Depository shares issued (in shares) |  |  |  |  |  | 5,200,000
Interest in preferred stock per depository share |  |  |  |  |  | 0.01
Six Point Seven Five Percentage Series B Mandatory Convertible Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Percentage of issued shares |  |  |  |  |  | 6.75%
Offering price per share (in usd per share) | $ / shares |  |  |  |  |  | $ 100
Threshold trading day period | trading_day |  |  |  |  |  | 20
Proceeds from offering, net | $ |  |  |  |  |  | $ 501,000
Six Point Seven Five Percentage Series B Mandatory Convertible Preferred Stock | Scenario, Forecast | Minimum |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock converted in to common stock (in shares) | 120.46 |  |  |  |  |
Number of common stock issued upon conversion (in shares) | 6,200,000 |  |  |  |  |
Six Point Seven Five Percentage Series B Mandatory Convertible Preferred Stock | Scenario, Forecast | Maximum |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock converted in to common stock (in shares) | 132.50 |  |  |  |  |
Number of common stock issued upon conversion (in shares) | 6,900,000 |  |  |  |  |

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