Divesture of Xpress Internacional - Assets and liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Liabilites associated with assets held for sale		$ 6,856
Long-term liabilities associated with assets held for sale		8,353
Impairment of assets held for sale and equity method investments and note receivable	$ 6,793	12,497
Xpress Internacional | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets of business held for sale		28,038
Property, plant and equipment		10,635
Other assets		994
Total disposal group assets held for sale		39,667
Liabilites associated with assets held for sale		6,856
Long-term liabilities associated with assets held for sale		8,353
Total liabilities associated with assets of business held for sale		15,209
Impairment of assets held for sale and equity method investments and note receivable		11,629
Fair value of disposal group held for sale		$ 12,829