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Consolidated Statement Of Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Stockholders' Equity [Abstract] |  |  |
Issuance of common stock (in shares) | 239,854 | 395,274 | 505,312
Issuance of deferred stock units (in shares) | 63,677 | 4,784 | 36,578
Special cash dividend, per share | $ 2.05 | $ 1.4 | $ 2

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