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Pension and Other Postretirement Plans (Summary of Stock Option Activity) (Details) - $ / shares | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Outstanding, Beginning Balance - Number of Option Shares | 889,300 | 575,000 | 575,000 |
Options Granted - Number of Option Shares |  |  |  |
Options Exercised - Number of Option Shares | (200) | (700) |  |
Options Forfeited - Number of Option Shares |  | (35,000) |  |
Options Expired - Number of Option Shares |  |  |  |
Outstanding, Ending Balance - Number of Option Shares | 889,100 | 539,300 | 889,300 | 575,000
Outstanding Option Shares, Range of Exercise Prices, Lower Range Limit | $ 8.93 | $ 8.93 | $ 8.93 | $ 8.93
Outstanding Option Shares, Range of Exercise Prices, Upper Range Limit | 13.32 | 13.32 | 13.32 | 13.32
Options Exercised - Exercise Price | 10.55 | 10.55 |  |
Options Shares Forfeited - Range of Exercise Prices, Lower Range Limit |  | 8.93 |  |
Options Shares Forfeited - Range of Exercise Prices, Upper Range Limit |  | 13.32 |  |
Outstanding Option Shares, Beginning Balance - Weighted Average Exercise Price | 11.42 | 10.78 | 10.78 |
Option Shares Exercised - Weighted Average Exercise Price | 10.55 | 0.00 |  |
Outstanding Option Shares, Ending Balance - Weighted Average Exercise Price | $ 10.91 | $ 10.78 | $ 11.42 | $ 10.78

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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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