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Short Term Investments (Tables) | 12 Months Ended
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Dec. 31, 2017
Short Term Investments [abstract] |
Schedule of Short Term Investments |
﻿ |  |  |  |  |
﻿ | December 31, |  |  | December 31,
﻿ |  | 2017 |  |  | 2016
﻿Term deposits and similar instruments | $ | 29,500 |  | $ | 41,100
﻿

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- Definition Disclosure of detailed information about short term investments. + References No definition available. + Details
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- Definition Disclosure of short term investments [abstract]. + References No definition available. + Details
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