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Share-Based and Other Deferred Compensation - Schedule of Changes in Termination Costs Liability (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Restructuring Reserve [Roll Forward]    
Beginning Balance $ 1,151 $ 505
Termination Costs Incurred 30,340 7,756
Cash Benefits Paid (26,492) (6,412)
Non-Cash Charges (410) (698)
Ending Balance $ 4,589 $ 1,151