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Equity Narratives (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 25, 2017 | Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Subsequent Event [Line Items] |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 4,793,635 |
Treasury Stock, Value, Acquired, Par Value Method |  |  | $ 148,800 |
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 31.04 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 219,400 | $ 219,400 |
Purchase of noncontrolling interest |  | $ 4,600 | $ 4,580 | $ 1,961
Business Acquisition, Percentage of Voting Interests Acquired |  | 11.00% | 11.00% |
Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Treasury Stock, Shares, Acquired | 390,063 |  |  |
Treasury Stock, Value, Acquired, Par Value Method | $ 13,400 |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 34.39 |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 206,000 |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The cash outflow associated with the purchase of noncontrolling interest 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 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the par value method. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: 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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