Note 18 - Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal										$ 43,935
State									381	43	(276)
Foreign									14,992	11,186	13,554
Total current income tax expense									15,373	55,164	13,278
Deferred:
Federal									(6,886)	(55,718)	57
State									(2,595)	(3,284)
Foreign									28,841	25,502	23,724
Total deferred tax benefit									19,360	(33,500)	23,781
Total Income tax provision	$ 31,386	$ 1,184	$ 29,105	$ (26,942)	$ (28,329)	$ 6,224	$ 32,765	$ 11,004	$ 34,733	$ 21,664	$ 37,059