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Equity Textuals (Details) - USD ($) $ / shares in Units, $ in Thousands | 2 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 19, 2019 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Purchase of noncontrolling interest |  |  | $ 0 | $ 4,580 | $ 1,961
Preferred Stock, Shares Authorized |  |  | 1,000,000 |  |
Preferred Stock, Par or Stated Value Per Share |  |  | $ 1 |  |
Common stock, shares authorized |  |  | 500,000,000 | 500,000,000 |
Common stock, par or stated value per share |  |  | $ 1 | $ 1 |
Common stock, shares, issued |  |  | 184,720,582 | 191,935,647 |
Common stock, shares outstanding |  |  | 181,470,582 | 186,614,747 |
Treasury Stock, Shares, Acquired |  |  | 7,347,838 | 6,210,606 |
Treasury Stock, Value, Acquired, Par Value Method |  |  | $ 277,600 | $ 199,600 |
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 37.78 | $ 32.14 |
Stock Repurchase Program, Authorized Amount |  |  | $ 400,000 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  | $ 192,500 |  |
Dividends declared per share |  | $ 0.51 | $ 0.68 | $ 0.58 |
Payments of Dividends, Common Stock |  |  | $ 123,849 | $ 108,750 | $ 98,418
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  | 22.00% |
Subsequent Event [Member] |  |  |  |  |
Treasury Stock, Shares, Acquired | 193,395 |  |  |  |
Treasury Stock, Value, Acquired, Par Value Method | $ 7,900 |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 40.70 |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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