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Stockholders Equity - Schedule of Accumulated Other Comprehensive Loss (AOCL), Net of Income Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Equity [Abstract]    
Unfunded pension plan obligation $ 8,409 $ 6,789
Unrealized losses on cash flow hedges, net 674 832
Other 12 (27)
Accumulated other comprehensive loss $ 9,095 $ 7,594