Note 21 - Reportable Segment Information - Reconciliation of Segment Assets to Total Consolidated Assets (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Total assets for reportable segments		$ 2,167,933	$ 2,402,652	$ 2,284,906	$ 2,263,279	$ 2,494,927
Cash and cash equivalents		293,991	255,084	175,022	360,911	395,647
Receivables, net		463,987	618,144	527,277	380,502	464,588	[1]
Other current assets, excluding segment assets		37,411	157,231	160,923	167,679	177,210
Property and equipment, net, excluding segment assets		509,210	500,827	464,593	450,250	433,504	[1]
Short-term and long-term marketable securities		26,569	21,575	21,675	21,775	15,600
Investments in affiliates		80,725	78,663	23,203	22,987	23,368
Right of use assets		49,079	49,590	45,404	48,920	49,312
Deferred income taxes, net		22,208	45,650	25,458	25,880	24,141
Other noncurrent assets, excluding segment assets		59,143	$ 58,265	$ 64,008	$ 65,888	67,888
Operating Segments [Member]
Total assets for reportable segments	[1]	797,204				691,650
Segment Reconciling Items [Member]
Cash and cash equivalents		293,991				395,647
Receivables, net		463,987				464,588
Other current assets, excluding segment assets		280,014				323,051
Current assets held for sale		0				392,641
Property and equipment, net, excluding segment assets		64,851				56,658
Short-term and long-term marketable securities		65,943				15,600
Investments in affiliates		80,725				23,368
Right of use assets		49,079				49,312
Deferred income taxes, net		22,209				24,141
Other noncurrent assets, excluding segment assets		$ 49,930				$ 58,271

[1] These balances do not include amounts held for sale (see Note 2).