Note 15 - Fair Value Disclosure of Financial Instruments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Note 15 - Fair Value Disclosure of Financial Instruments (Details) [Line Items]
Marketable Securities	[1]	$ 7,565	$ 90,235
Asset Impairment Charges		45,464	217,858	$ 190,218
Cost-method Investments, Other than Temporary Impairment		9,000	4,800
Income Tax Expense (Benefit)		60,230	22,438	32,654
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		21,073	(134,351)
Preferred Equity Investment [Member]
Note 15 - Fair Value Disclosure of Financial Instruments (Details) [Line Items]
Equity Method Investment, Other than Temporary Impairment			1,600
Foreign Currency Gain (Loss) [Member]
Note 15 - Fair Value Disclosure of Financial Instruments (Details) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(92,900)
Other Real Estate Investments [Member]
Note 15 - Fair Value Disclosure of Financial Instruments (Details) [Line Items]
Asset Impairment Charges		5,300
Impairment of Real Estate	[2],[3]	5,300	1,700	$ 2,900
Certain Marketable Securities [Member]
Note 15 - Fair Value Disclosure of Financial Instruments (Details) [Line Items]
Asset Impairment Charges		800
Sold Sites [Member]
Note 15 - Fair Value Disclosure of Financial Instruments (Details) [Line Items]
Asset Impairment Charges		10,200
Discontinued Operations [Member]
Note 15 - Fair Value Disclosure of Financial Instruments (Details) [Line Items]
Asset Impairment Charges		100	178,000
Income Tax Expense (Benefit)			(1,700)
Fair Value, Estimate Not Practicable, Carrying (Reported) Amount [Member]
Note 15 - Fair Value Disclosure of Financial Instruments (Details) [Line Items]
Impairment of Real Estate		$ 20,200	$ 118,400
Minimum [Member]
Note 15 - Fair Value Disclosure of Financial Instruments (Details) [Line Items]
Fair Value Inputs, Cap Rate		8.25%	7.00%
Fair Value Inputs, Discount Rate		9.25%	7.50%
Maximum [Member]
Note 15 - Fair Value Disclosure of Financial Instruments (Details) [Line Items]
Fair Value Inputs, Cap Rate		8.50%	12.50%
Fair Value Inputs, Discount Rate		9.75%	13.50%
Fair Value, Inputs, Level 1 [Member]
Note 15 - Fair Value Disclosure of Financial Instruments (Details) [Line Items]
Marketable Securities		$ 5,900	$ 87,700
Impairment of Real Estate		5,700	88,200
Fair Value, Inputs, Level 3 [Member]
Note 15 - Fair Value Disclosure of Financial Instruments (Details) [Line Items]
Marketable Securities		1,700	2,300
Impairment of Real Estate		5,600	$ 30,200
Fair Value, Inputs, Level 2 [Member]
Note 15 - Fair Value Disclosure of Financial Instruments (Details) [Line Items]
Impairment of Real Estate		$ 8,900

[1] As of December 31, 2015 and 2014, the Company determined that $5.9 million and $87.7 million, respectively, of the Marketable securities estimated fair value were classified within Level 1 of the fair value hierarchy and the remaining $1.7 million and $2.3 million, respectively, were classified within Level 3 of the fair value hierarchy.

[2] Impairment charges primarily based upon review of residual values, sales prices and debt maturity status and the likelihood of foreclosure of certain underlying properties within the Company's preferred equity investments, during 2015, 2014 and 2013. The Company believes it will not recover its investment in certain preferred equity investments and as such recorded full impairments on these investments.

[3] See Footnote 15 for additional disclosure on fair value