Note 16 - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017
Beginning balance				$ 5,522,147		$ 5,402,874
Net current-period other comprehensive income		$ (72)	$ (7,800)	344		(7,493)
Ending balance		5,456,097	5,408,144	5,456,097		5,408,144
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Beginning balance				(344)		(975)
Other comprehensive income before reclassifications				437		308
Amounts reclassified from AOCI (1)				(93)	[1]		[2]
Net current-period other comprehensive income				344		308
Ending balance			(667)			(667)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Beginning balance						6,335
Other comprehensive income before reclassifications						3,711
Amounts reclassified from AOCI (1)	[2]					(10,046)
Net current-period other comprehensive income						(6,335)
Ending balance
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Beginning balance						406
Other comprehensive income before reclassifications						(1,466)
Amounts reclassified from AOCI (1)	[2]
Net current-period other comprehensive income						(1,466)
Ending balance			(1,060)			(1,060)
AOCI Attributable to Parent [Member]
Beginning balance				(1,480)		5,766
Other comprehensive income before reclassifications						2,553
Amounts reclassified from AOCI (1)	[2]					(10,046)
Net current-period other comprehensive income						(7,493)
Ending balance			$ (1,727)			$ (1,727)

[1] Amounts reclassified to Other income, net on the Company's Condensed Consolidated Statements of Income.

[2] During the nine months ended September 30, 2017, the Company was deemed to have substantially liquidated its investment in Canada and as a result, recognized a net cumulative foreign currency translation gain. Amounts were reclassified to the Company's Consolidated Statements of Income as follows (i) $14.8 million of gain was reclassified to Equity in income of other real estate investments, net, and (ii) $4.8 million of loss was reclassified to Equity in income of joint ventures, net.