Pension and Retirement Plans - Schedule of Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss/(gain)	$ 3,709	$ 5,427
Prior service (benefit)	(7)	(12)
Total	3,702	5,415
Supplemental Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss/(gain)	1,128	358
Total	1,128	358
Postretirement Healthcare Plan
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss/(gain)	(34)	(113)
Total	$ (34)	$ (113)