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Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning Balance $ 174,099 $ 547,229
Ending Balance 112,259 210,468
Cumulative Foreign Currency Translation Adjustments    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning Balance (16,686) (23,799)
Other comprehensive income (loss) before reclassifications (980) (7,342)
Net other comprehensive income (loss) (980) (7,342)
Ending Balance (17,666) (31,141)
Unrecognized Net Actuarial Loss and Prior Service Credit, Net    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning Balance (13,955) (11,900)
Amounts reclassified from AOCI, net of tax 205 354
Net other comprehensive income (loss) 205 354
Ending Balance (13,750) (11,546)
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning Balance (30,641) (35,699)
Other comprehensive income (loss) before reclassifications (980) (7,342)
Amounts reclassified from AOCI, net of tax 205 354
Net other comprehensive income (loss) (775) (6,988)
Ending Balance $ (31,416) $ (42,687)