Major classes of assets and liabilities held for sale (Details 2) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Total current assets held for sale	$ 425	$ 430
Noncurrent assets:
Total noncurrent assets held for sale	1,426	2,087
Current liabilities:
Total current liabilities held for sale	3,511	4,001
Discontinued operations, held-for-sale or disposed by sale
Current assets:
Receivables, net	425	430
Total current assets held for sale	425	430
Noncurrent assets:
Deferred income taxes	1,265	1,926
Other	161	161
Total noncurrent assets held for sale	1,426	2,087
Total assets held for sale	1,851	2,517
Current liabilities:
Accounts payable	0	80
Taxes payable	1,279	1,451
Other accrued liabilities	2,232	2,470
Total current liabilities held for sale	3,511	4,001
Total liabilities held for sale	$ 3,511	$ 4,001