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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 30, 2016
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  | 15,000,000 |  |  |
Payment for repurchase of common stock |  |  | $ 250,000 | $ 0 | $ 0 |
Shares available for repurchase (in shares) |  |  | 12,658,917 |  |  |
Preferred shares issued |  |  | 0 |  |  |
Accelerated Share Repurchase Agreement |  |  |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |
Payment for repurchase of common stock |  | $ 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) |  |  | 8,050 |  |  |
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 |  |  |
Common Stock |  |  |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |  |  |
Common stock repurchased |  |  |  | 0 | 0 |

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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