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Earnings Per Share - Additional Information (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 16, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2016
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  | 15,000,000 |  |  |
Payment for repurchase of common stock |  |  | $ 500,000 | $ 250,000 | $ 0 |
Shares available for repurchase (in shares) |  |  | 7,396,263 |  |  |
Preferred shares issued |  |  | 0 |  |  |
Accelerated Share Repurchase Agreement |  |  |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |
Payment for repurchase of common stock |  | $ 250,000 | $ 250,000 |  |  |
Maximum |  |  |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  |  |  | 15,000,000
Restricted Stock |  |  |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |
Number of shares containing nonforfeitable rights to dividends (in shares) |  |  | 8,400 |  |  |
Initial Delivery | Accelerated Share Repurchase Agreement |  |  |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |
Repurchase of common stock shares (in shares) |  | 1,948,178 |  |  |  |
Final Settlement | Accelerated Share Repurchase Agreement |  |  |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |
Repurchase of common stock shares (in shares) | 392,905 |  |  |  |  |
Total Delivery | Accelerated Share Repurchase Agreement |  |  |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |
Repurchase of common stock shares (in shares) |  |  | 5,262,654 | 2,341,083 |  |
Total Delivery | May 2018 Accelerated Share Repurchase Agreement |  |  |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |
Repurchase of common stock shares (in shares) |  |  | 2,680,704 |  |  |
Total Delivery | August 2018 Accelerated Share Repurchase Agreement |  |  |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |
Repurchase of common stock shares (in shares) |  |  | 2,581,950 |  |  |
Common Stock |  |  |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share |  |  | 123,730 |  |  |
Common stock repurchased |  |  |  |  | 0 |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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