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Earnings Per Share - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 16, 2017 | Mar. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Nov. 06, 2017 | Jul. 10, 2017 | Feb. 23, 2017
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |  |
Increase in dividend rate, percentage |  |  |  |  |  |  | 5.00%
Cash dividend, amount per share (in dollars per share) |  |  |  |  |  | $ 0.32 | $ 0.32
Payment for repurchase of common stock |  |  | $ 250,000 | $ 0 |  |  |
Number of shares authorized to be repurchased (in shares) |  |  | 15,000,000 |  |  |  |
Shares available for repurchase (in shares) |  |  | 12,658,917 |  |  |  |
Accelerated Share Repurchase Agreement |  |  |  |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |  |
Payment for repurchase of common stock |  | $ 250,000 |  |  |  |  |
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) |  |  | 2,341,083 |  |  |  |
Subsequent Event |  |  |  |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |  |
Cash dividend, amount per share (in dollars per share) |  |  |  |  | $ 0.32 |  |

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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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