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Commitments and Contingencies (Summary of Company's Contractual Cash Obligations) (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Time Deposits, Less than 1 Year $ 52,181
Time Deposits, 1 to 3 Years 19,504
Time Deposits, 3 to 5 Years 2,453
Time Deposits, over 5 Years
Time Deposits, Total 74,138
Commitments, Less than 1 Year 52,181
Commitments, 1 to 3 Years 19,504
Commitments, 3 to 5 Years 2,453
Commitments, Over 5 Years
Commitments, Total $ 74,138