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FINANCIAL INSTRUMENTS - Fair Values (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 19, 2017
Dec. 03, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]        
Debt Issuance Costs, Net $ 24,053     $ 26,308
Carrying Value and Estimated Fair Values        
Cash collateral 397,815     416,028
Derivative asset 112,317     20,022
Derivative liability 40,364     59,226
Gross amounts presented in the consolidated balance sheet, Total asset derivatives 10,166     5,022
Gross amounts not offset in the consolidated balance sheet subject to netting agreements 0     (1,351)
Net amount, Total asset derivatives 10,166     3,671
Gross amounts presented in the consolidated balance sheet, Total liability derivatives 0     1,470
Net amount, Total liability derivatives 0     119
Energy Related Derivative        
Carrying Value and Estimated Fair Values        
Derivative asset 94,700 $ 79,600   0
Derivative liability     $ 79,600  
Interest rate swap        
Carrying Value and Estimated Fair Values        
Derivative asset 10,166     5,022
Derivative liability 0     1,470
Equity Swap        
Carrying Value and Estimated Fair Values        
Derivative liability 40,141     56,763
Currency swap        
Carrying Value and Estimated Fair Values        
Derivative asset 51     0
Derivative liability 223     993
Earn-Out Units        
Carrying Value and Estimated Fair Values        
Derivative asset 7,400     15,000
Level 1 | Carrying Value        
Carrying Value and Estimated Fair Values        
Cash and cash equivalents 214,862     224,190
Restricted cash and short-term deposits 397,815     416,028
Level 1 | Fair Value        
Carrying Value and Estimated Fair Values        
Cash and cash equivalents 214,862     224,190
Restricted cash and short-term deposits 397,815     416,028
Level 3 | Carrying Value        
Carrying Value and Estimated Fair Values        
Cost method investments 7,347     7,347
Level 3 | Fair Value        
Carrying Value and Estimated Fair Values        
Cost method investments 7,347     7,347
Level 2 | Carrying Value        
Carrying Value and Estimated Fair Values        
Current portion of long-term debt 1,393,229     484,705
Long-term debt - convertible bond 340,173     218,851
Long-term debt 701,498     1,124,105
Level 2 | Carrying Value | Energy Related Derivative        
Carrying Value and Estimated Fair Values        
Derivative asset 94,700     0
Level 2 | Carrying Value | Interest rate swap        
Carrying Value and Estimated Fair Values        
Derivative asset 10,166     5,022
Derivative liability 0     1,470
Level 2 | Carrying Value | Equity Swap        
Carrying Value and Estimated Fair Values        
Derivative liability 40,141     56,763
Level 2 | Carrying Value | Currency swap        
Carrying Value and Estimated Fair Values        
Foreign exchange swaps asset 51     0
Foreign exchange swaps liability (4)(5) 223     993
Level 2 | Carrying Value | Earn-Out Units        
Carrying Value and Estimated Fair Values        
Derivative asset 7,400     15,000
Level 2 | Fair Value        
Carrying Value and Estimated Fair Values        
Current portion of long-term debt 1,393,229     484,705
Long-term debt - convertible bond 430,361     219,428
Long-term debt 701,498     1,124,105
Level 2 | Fair Value | Energy Related Derivative        
Carrying Value and Estimated Fair Values        
Derivative asset 94,700     0
Level 2 | Fair Value | Interest rate swap        
Carrying Value and Estimated Fair Values        
Derivative asset 10,166     5,022
Derivative liability 0     1,470
Level 2 | Fair Value | Equity Swap        
Carrying Value and Estimated Fair Values        
Derivative liability 40,141     56,763
Level 2 | Fair Value | Currency swap        
Carrying Value and Estimated Fair Values        
Foreign exchange swaps asset 51     0
Foreign exchange swaps liability (4)(5) 223     993
Level 2 | Fair Value | Earn-Out Units        
Carrying Value and Estimated Fair Values        
Derivative asset $ 7,400     $ 15,000