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Note 18 - Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets (liabilities):        
Net foreign deferred taxes, primarily depreciation $ (61,961) $ (35,382)    
Depreciation, deferred tax liability (65,312)      
Depreciation, deferred tax asset   148,419    
Intangible drilling costs 12,934 (112,762)    
Net capital loss carryforward - U.S. 44,619 117,924    
Tax monetization transaction (6,465) (105,789)    
State and Investment tax credits 813 1,341    
Production tax credits 85,193 82,451    
Foreign tax credits 86,206    
Withholding tax (14,400)    
Stock options amortization 1,166 3,241    
Basis difference in partnership interest (14,731) (24,462)    
Accrued liabilities and other 2,931 (752)    
70,993 74,229    
Less - valuation allowance (50,858) (109,611) $ (70,536) $ (111,280)
Total $ 20,135      
Total   $ (35,382) $ (32,654)