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Note 16 - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Beginning balance	$ 5,522,147	$ 5,402,874
Ending balance	5,502,402	5,359,546
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Beginning balance	(344)	(975)
Other comprehensive income before reclassifications	(278)	(188)
Amounts reclassified from AOCI
Net current-period other comprehensive income		188
Ending balance	(66)	(787)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Beginning balance		6,335
Other comprehensive income before reclassifications		(503)
Amounts reclassified from AOCI
Net current-period other comprehensive income		503
Ending balance		6,838
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Beginning balance		406
Other comprehensive income before reclassifications		(28)
Amounts reclassified from AOCI
Net current-period other comprehensive income		28
Ending balance		434
AOCI Attributable to Parent [Member]
Beginning balance	(1,480)	5,766
Other comprehensive income before reclassifications		(719)
Amounts reclassified from AOCI
Net current-period other comprehensive income		719
Ending balance	$ (66)	$ 6,485

X

- Definition

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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