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Defined Benefit Pension Plans - Schedule of Defined Benefit Plans Disclosures (Details) - Pension Plan - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 311 $ 356 $ 631 $ 672
Interest cost 4,097 5,614 8,238 11,198
Expected return on assets (6,945) (7,372) (13,963) (14,843)
Amortization of actuarial loss 2,614 2,662 5,234 5,384
Net periodic cost $ 77 $ 1,260 $ 140 $ 2,411