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Other liabilities (Narrative) (Details)
12 Months Ended
Dec. 31, 2019
Other Liabilities [Abstract]  
Short-term leases Expenses related to short-term leases and leases of low-value assets were insignificant during 2019.
Low-value leases Expenses related to short-term leases and leases of low-value assets were insignificant during 2019.