Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands |
12 Months Ended | |
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Dec. 31, 2017 |
Dec. 31, 2016 |
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| Recent Accounting Pronouncements | ||
| Net periodic benefit cost for pensions and other postretirement benefits | $ 1,278 | $ 1,221 |
| Service cost | 561 | $ 531 |
| Accounting Standards Update (“ASU”) No. 2014-09 | ||
| Recent Accounting Pronouncements | ||
| Adjustment to retained earnings | 400 | |
| Accounting Standards Update (“ASU”) No. 2014-09 | Minimum | ||
| Recent Accounting Pronouncements | ||
| Expected impact to revenue | 2,000 | |
| Accounting Standards Update (“ASU”) No. 2014-09 | Maximum | ||
| Recent Accounting Pronouncements | ||
| Expected impact to revenue | $ 4,000 | |
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of the effect of a change in accounting principle on operating profit or loss. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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. No definition available.
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