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Employee Benefits (Details) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) shares | Mar. 31, 2018 USD ($) Employee shares | Mar. 31, 2017 USD ($) | [1]
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of former union employees not covered under plan | Employee |  | 39 |
Postretirement Benefits [Member] |  |  |
Net Periodic benefit costs related to retirement plans [Abstract] |  |  |
Service cost |  | $ 0 | $ 0
Interest cost |  | 2 | 2
Amortization of prior service cost |  | 0 | 0
Actuarial net (gain) loss |  | (9) | (59)
Net periodic benefit cost (credit) |  | $ (7) | $ (57)
Supplemental Executive Retirement Plan [Member] |  |  |
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |
Employer discretionary contribution amount | $ 600 |  |
Employee Stock Ownership Plan and Trust (ESOP) [Member] |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
Additional shares contributed to ESOP (in shares) | shares |  | 53,300 |
Shares released from trust (in shares) | shares | 53,300 | 53,300 |
Total remaining balance of shares in the ESOP (in shares) | shares | 200 | 200 |
[1] | Net periodic benefit cost (credit) has been reclassified from selling, general and administrative expenses to other non-operating income (expense), net on our consolidated statement of operations upon adoption of ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, see Note 2, "Summary of Significant Accounting Policies" for additional information.

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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