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Consolidated Condensed Statement of Equity (Parenthetical) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Consolidated Condensed Statement of Equity [Abstract] |  |  |
Restricted stock issuances (in shares) | 211,328 | 200,688 | 110,825
Stock repurchase (in shares) |  | 2,250,236 | 1,752,454
Stock options exercised (in shares) |  | 77,334 | 27,619
Conversion of Class B shares | 31,800 |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 0.0675 | $ 0.2550 | $ 0.2500

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