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Commitments and Contingencies (Summary of Company's Contractual Cash Obligations) (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Time Deposits, Less than 1 Year $ 41,390
Time Deposits, 1 to 3 Years 14,098
Time Deposits, 3 to 5 Years 48
Time Deposits, over 5 Years
Time Deposits, Total $ 55,536