Contract Liabilities (Tables) |
6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Revenue from Contract with Customer [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
Disaggregation of Revenue [Table Text Block] |
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Contract with Customer, Asset and Liability [Table Text Block] |
The following table shows the changes in contract liability balances relating to prepaid supply agreements during the first six months of 2018:
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- Definition Tabular disclosure of contract balances and changes in contract balances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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