XML 58 R39.htm IDEA: XBRL DOCUMENT v3.10.0.1
Note 4 - Investment in an Unconsolidated Company (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 01, 2018
USD ($)
Jun. 04, 2014
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
MWh
Jun. 30, 2017
USD ($)
May 16, 2014
USD ($)
Number of Commercial Lenders in Funding Consortium             6
Interest Expense, Total     $ 15,846 $ 14,540 $ 30,190 $ 29,463  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax     $ 529 (916) $ 3,163 (347)  
Accounting Standards Update 2014-09 [Member]              
Cumulative Effect on Retained Earnings, Net of Tax, Total $ 24,000            
Sarulla [Member] | Lenders Consortium [Member]              
Senior Notes, Total             $ 1,170,000
Sarulla [Member]              
Jointly Owned Utility Plant, Proportionate Ownership Share     12.75%   12.75%    
Expected Power Generating Capacity | MWh         330    
Number of Phases of Construction         3    
Power Utilization | MWh         110    
Power Plant Usage Agreement Term         30 years    
Payments to Acquire Projects     $ 2,500   $ 3,800    
Accumulated Cash Contributions to Acquire Projects     62,000   $ 62,000    
Contract Effective Date         April 4, 2013    
Sarulla [Member] | Accounting Standards Update 2014-09 [Member]              
Equity Method Investments 24,000            
Cumulative Effect on Retained Earnings, Net of Tax, Total $ 24,000            
Sarulla [Member] | Interest Rate Swap [Member]              
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax     500 (900) $ 3,200 (300)  
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax, Ending Balance     1,900   1,900    
Sarulla [Member] | Interest Rate Swap [Member] | Sarulla Project Company [Member]              
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax     $ 4,200 $ (7,200) 24,800 $ (2,700)  
Sarulla [Member] | Lenders Consortium [Member] | Interest Rate Swap [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument, Basis Spread on Variable Rate   3.4565%          
Sarulla [Member] | Lenders Consortium [Member] | Subject to Fixed Interest Rate [Member]              
Senior Notes, Total             100,000
Sarulla [Member] | Lenders Consortium [Member] | Subject to Fixed LIBOR Interest Rate [Member]              
Senior Notes, Total             $ 1,070,000
Interest Expense, Total         $ 23,100    
Sarulla [Member] | Lenders Consortium [Member] | Subject to Fixed LIBOR Interest Rate [Member] | Interest Rate Swap [Member]              
Senior Notes, Total   $ 960,000