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Commitments and Contingencies (Summary of Company's Contractual Cash Obligations) (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Operating lease commitments, Less than 1 Year $ 1,614
Operating lease commitments, 1 to 3 Years 3,570
Operating lease commitments, 3 to 5 Years 2,431
Operating lease commitments, Over 5 Years 2,460
Operating lease commitments, Total 10,075
Time Deposits, Less than 1 Year 43,033
Time Deposits, 1 to 3 Years 10,769
Time Deposits, 3 to 5 Years 2,467
Time Deposits, over 5 Years
Time Deposits, Total 56,269
Commitments, Less than 1 Year 44,647
Commitments, 1 to 3 Years 14,339
Commitments, 3 to 5 Years 4,898
Commitments, Over 5 Years 2,460
Commitments, Total $ 66,344