Note 18 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	$ 15,600		$ 15,600
Income Tax Expense (Benefit)	57,254	$ 66,857	104,502	$ 109,400
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	156,248	$ 179,617	286,116	$ 294,821
Deferred Tax Assets, Operating Loss Carryforwards	96,100		96,100
Deferred Tax Assets, Other	198,200		198,200
Unrecognized Tax Benefits	13,300		$ 13,300		$ 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	314,400		$ 314,400
Deferred Tax Assets, Valuation Allowance	1,900		1,900
Subject to 382 Limitations [Member]
Deferred Tax Assets, Operating Loss Carryforwards	15,300		15,300
Not Limited by Section 382 [Member]
Deferred Tax Assets, Operating Loss Carryforwards	$ 4,800		$ 4,800