Note 7 - Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Balance	$ 814,931
Balance	933,244
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Balance	(11,983)	[1]
Activity in the period	(441)
Balance	(12,424)	[1]
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]
Balance	10,769	[1]
Activity in the period	(1,235)
Balance	9,534
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Balance	(73,365)	[1]
Activity in the period	2,912
Balance	(70,453)
Accumulated Other-than-Temporary Impairment Including Portion Attributable to Noncontrolling Interest [Member]
Balance	(74,579)	[1]
Activity in the period	1,236
Balance	$ (73,343)

[1] The balances at September 30, 2017 and December 31, 2016 are net of taxes of $1.2 million and $1.1 million, respectively.