Note 21 - Reportable Segment Information - Reconciliation of Segment Assets to Total Consolidated Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total assets for reportable segments	$ 2,494,927	$ 2,379,996
Cash and cash equivalents	395,647	425,292	$ 252,345
Receivables, net	464,588	437,558
Other current assets, excluding segment assets	177,210	37,767
Current assets held-for-sale	392,641	171,263
Property and equipment, net, excluding segment assets	433,504	421,149
Long-term marketable securities	15,600	5,200
Investments in affiliates	23,368	27,637
Right of use assets	49,312	52,987
Deferred income taxes, net	24,141	43,111
Other noncurrent assets, excluding segment assets	67,888	68,847
Noncurrent assets held for sale	0	252,104
Operating Segments [Member]
Total assets for reportable segments	691,650	687,643
Segment Reconciling Items [Member]
Cash and cash equivalents	395,647	425,292
Receivables, net	464,588	437,558
Other current assets, excluding segment assets	323,051	170,006
Property and equipment, net, excluding segment assets	56,658	48,941
Investments in affiliates	23,368	27,637
Deferred income taxes, net	24,141	43,111
Other noncurrent assets, excluding segment assets	$ 58,271	$ 58,254