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Equity (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) day $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) shares | Feb. 26, 2018 USD ($) | Dec. 26, 2013 USD ($)
Class of Stock [Line Items] |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 | $ 0.001 |  |  |
Common stock authorized (shares) | 250,000,000 |  |  |  |
Common stock authorized for repurchase | $ | $ 68,800,000 |  |  |  | $ 350,000,000
Stock repurchased during period (shares) | 5,700,000 | 0 | 6,500,000 |  |
Stock repurchased during period | $ | $ 50,000,000 | $ 0 | $ 85,900,000 |  |
Preferred shares authorized (shares) | 4,000,000.0 |  |  |  |
Preferred stock issued (shares) | 0 | 0 |  |  |
Preferred shares outstanding (shares) | 0 | 0 |  |  |
Series A Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Series A preferred shares authorized (shares) | 1,000,000.0 |  |  |  |
Series A preferred shares par value (in usd per share) | $ / shares | $ 0.001 |  |  |  |
Series A preferred shares issued (shares) | 200,000 |  |  |  |
Series A preferred shares stated value per share (in usd per share) | $ / shares | $ 1,000 |  |  |  |
Series A preferred shares dividend rate (percent) | 6.00% |  |  |  |
Series A preferred shares accrued dividends | $ | $ 3,000,000 |  |  |  |
Series A preferred shares conversion price (in usd per share) | $ / shares | $ 14.50 |  |  |  |
Series A preferred shares, minimum stock price threshold for conversion (in usd per share) | $ / shares | $ 29.00 |  |  |  |
Series A preferred shares, number of conservative trading days | day | 20 |  |  |  |
Series A preferred shares, number of shares issuable if converted (shares) | 13,793,100 |  |  |  |
Series A preferred shares percentage of stated redemption value (percent) | 100.00% |  |  |  |
Series A Preferred Stock [Member] | Blackstone [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Series A preferred shares percentage of stated redemption value (percent) | 101.00% |  |  |  |
Series A preferred shares redemption value | $ | $ 200,000,000 |  |  |  |
If Dividends not Paid Timely [Member] | Series A Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Series A preferred shares dividend rate (percent) | 8.00% |  |  |  |
Subsequent Event [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock authorized for repurchase | $ |  |  |  | $ 500,000,000.0 |

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