Note 6 - Accumulated Other Comprehensive Loss - Reclassifications from AOCL (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Loss on pension settlement	[1]	$ 10,920		$ (0)		$ (0)
Total before tax		319,607		311,076		203,699
Income tax impact		67,299		69,856		$ 44,142
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Amortization of net loss				(802)
Amounts reclassified from AOCL		(9,067)	[2]	$ (593)	[3]
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Loss on pension settlement		10,920
Amortization of net loss		843
Total before tax		11,763
Income tax impact		(2,696)
Amounts reclassified from AOCL		$ 9,067

[1] Represents pre-tax settlement charges related to the termination of the Company’s domestic pension plan in the fourth quarter of 2019.

[2] Details of reclassifications from AOCL during 2019 are as follows: Amounts reclassified from AOCL Loss on pension settlement $ 10,920 Amortization of net loss 843 Total before tax 11,763 Income tax impact (2,696 ) Amounts reclassified from AOCL $ 9,067

[3] Represents actuarial losses of $802, net of tax effect of $(209), amortized to net periodic pension cost for the year ended December 31, 2018. Refer to Note 16, "Benefit Plans," to the consolidated financial statements for additional information.