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Note 18 - Income Taxes - Components of Income Tax Provision (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:                      
Federal                 $ 43,850 $ 51
State                 108 (276) 252
Foreign                 10,816 14,040 19,175
Total current income tax expense                 54,774 13,764 19,478
Deferred:                      
Federal                 (78,220)
State                 (4,544)
Foreign                 26,579 18,073 (34,736)
Total deferred tax benefit                 (56,185) 18,073 (34,736)
Total provision (benefit) for income taxes $ (29,669) $ 11,003 $ 6,369 $ 10,886 $ 2,450 $ 11,988 $ 7,890 $ 9,509 $ (1,411) $ 31,837 $ (15,258)