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Earnings per Common Share - Calculation of Weighted-Average Shares Excluded from Diluted EPS (Details) - shares shares in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Stock appreciation rights and stock awards |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Weighted-average stock appreciation rights and stock awards excluded from diluted EPS due to the anti-dilutive effect calculated using the treasury stock method | 1 | 2 | 1 | 6

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- Definition Antidilutive Securities Excluded from Computation of EPS, Amount, Treasury Stock Method + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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