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Note 18 - Income Taxes - Significant Components of Deferred Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other deferred tax expense (exclusive of the effect of other components listed below) $ 1,833 $ (1,105) $ 541
Usage (benefit) of operating loss carryforwards - U.S. 73,049 (14,072) (30,596)
Change in valuation allowance (58,757) 16,411 (14,324)
Change in foreign valuation allowance (49,701)
Change in foreign income tax 26,579 18,073 14,965
Change in lease transaction (452)
Change in tax monetization transaction (23,234) 48,000 16,386
Change in depreciation 129,408 (55,462) 28,370
Change in foreign tax credits (86,206)
Change in withholding tax 14,400
Change in state and investment tax credits (144)
Change in intangible drilling costs (118,610) 10,227 10,335
Change in production tax credits and alternative minimum tax credit (2,070) (11,659) 610
Basis difference in partnership interests (12,433) 7,660 (10,870)
$ (56,185) $ 18,073 $ (34,736)