Note 22 - Income Taxes (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Aug. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Apr. 01, 2013
Required Dividend Payout		90.00%
Effective Income Tax Rate, Reconciliation Deductions, One-time Allowable Deduction			$ 85,900
Deferred Tax Assets, Valuation Allowance		$ 55,600
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax		3,100
Taxable Income		236,895	454,021	$ 300,667
Unrecognized Tax Benefits		4,962	4,263	$ 4,649
CANADA
Unrecognized Tax Benefits		$ 4,900
Latest Tax Year [Member]
Open Tax Year		2016
KRS [Member]
Deferred Tax Assets, Valuation Allowance					$ 63,500
Taxable Income		$ 20,600	19,700
Operating Loss Carryforwards		44,000	70,300
State and Local Jurisdiction [Member]
Deferred Tax Assets, Valuation Allowance		7,900
Canada Revenue Agency [Member]
Current Foreign Tax Expense (Benefit)		$ 24,900	53,500
Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]
Income Tax Examination, Year under Examination		2009
Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]
Income Tax Examination, Year under Examination		2004
Internal Revenue Service (IRS) [Member] | Tax Year 2009 [Member]
Income Tax Examination, Potential Penalty, Percent		100.00%
Income Tax Examination, Penalties Expense		$ 40,900
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority		(100)
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities		$ 2,000
Mexican Tax Authority [Member] | Tax Year 2010 [Member]
Income Tax Examination, Year under Examination	2010
Tax Assessment Estimated Tax Expense	$ 33,700
Tax Assessment Estimated Interest Expense	16,500
Tax Assessment Estimated Penalties Expense	11,400
Taxes Payable	$ 0
REIT Eligibility [Member]
Number of Years		4 years
Used [Member] | KRS [Member]
Operating Loss Carryforwards		$ 20,600	$ 19,700