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Note 7 - Income Taxes - Current and Deferred Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 134,284 $ 191,422 $ 160,235
State and local 23,456 21,871 22,306
Current income taxes, total 157,740 213,293 182,541
Deferred:      
Federal (261,592) 45,846 71,292
State and local 12,828 4,568 9,135
Deferred income taxes, total (248,764) 50,414 80,427
Total tax expense/(benefit) $ (91,024) $ 263,707 $ 262,968