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Employee Benefits (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2017
USD ($)
 [1]
Jun. 30, 2018
USD ($)
Employee
shares
Jun. 30, 2017
USD ($)
 [1]
Benefit Plan [Abstract]          
Number of former union employees not covered under plan | Employee       20  
Postretirement Benefits [Member]          
Net Periodic benefit costs related to retirement plans [Abstract]          
Service cost   $ 0 $ 0 $ 0 $ 0
Interest cost   1 2 3 4
Amortization of prior service cost   0 0 0 0
Actuarial net gain   (12) (271) (21) (330)
Net periodic benefit cost (credit)   $ (11) $ (269) $ (18) $ (326)
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), Debt Structure [Abstract]          
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.