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Investments (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments [Abstract] |
Noncontrolling Interest [Table Text Block] | The following table sets forth a summary of the change in noncontrolling interest: ﻿
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﻿Years ended December 31 |  | 2017 |  | 2016 |  | 2015
﻿Noncontrolling interest at beginning of period | $ | 13,762 | $ | 13,310 | $ | 22,550
﻿Net loss |  | (130) |  | (1,887) |  | (2,207)
﻿Foreign currency translation |  | 826 |  | 2,339 |  | (7,033)
﻿Comprehensive income (loss) |  | 696 |  | 452 |  | (9,240)
﻿Acquisition of noncontrolling interest |  | (14,458) |  | - |  | -
﻿Noncontrolling interest at end of period | $ | - | $ | 13,762 | $ | 13,310
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