Note 18 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Income Tax Expense (Benefit)	$ 52,820	$ 78,398	$ 157,322	$ 187,798
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	146,172	$ 210,746	432,288	$ 505,567
Deferred Tax Assets, Operating Loss Carryforwards	96,000		96,000
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	15,600		15,600
Deferred Tax Assets, Other	192,100		192,100
Unrecognized Tax Benefits	14,000		$ 14,000		$ 12,100
Latest Tax Year [Member]
Open Tax Year			2016
Earliest Tax Year [Member]
Open Tax Year			2012
State and Local Net Operating Loss Carryforwards Limited to Shorter Carryforward Periods [Member]
Deferred Tax Assets, Gross	309,200		$ 309,200
Deferred Tax Assets, Valuation Allowance	1,900		1,900
Subject to 382 Limitations [Member]
Deferred Tax Assets, Operating Loss Carryforwards	16,100		16,100
Not Limited by Section 382 [Member]
Deferred Tax Assets, Operating Loss Carryforwards	$ 5,000		$ 5,000