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FINANCIAL INSTRUMENTS (Restated) - Fair Values (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Carrying Value and Estimated Fair Values    
Gross amounts presented in the consolidated balance sheet, Total asset derivatives $ 5,330 $ 12,603
Gross amounts not offset in the consolidated balance sheet subject to netting agreements (216) (292)
Net amount, Total asset derivatives 5,114 12,311
Gross amounts presented in the consolidated balance sheet, Total liability derivatives 4,597 3,038
Net amount, Total liability derivatives 4,381 2,746
Cash collateral $ 408,563 74,587
Share Repurchase Forward Swap    
Carrying Value and Estimated Fair Values    
Collateral required under share repurchase agreement, percentage of total purchase price 20.00%  
Cash collateral $ 92,800  
Interest rate swap    
Carrying Value and Estimated Fair Values    
Derivative asset 5,330 12,603
Interest rate swap | Not Designated as Hedging Instrument    
Carrying Value and Estimated Fair Values    
Derivative asset 5,330 12,603
Derivative liability 4,597 2,673
Interest rate swap | Designated as Hedging Instrument    
Carrying Value and Estimated Fair Values    
Derivative liability 0 365
Interest rate swap | Cash flow hedging    
Carrying Value and Estimated Fair Values    
Fair value/carrying value of derivatives   400
Notional value   100,900
Interest rate swap | Cash flow hedging | Designated as Hedging Instrument    
Carrying Value and Estimated Fair Values    
Notional value 1,250,000 1,475,937
Equity Swap | Not Designated as Hedging Instrument    
Carrying Value and Estimated Fair Values    
Derivative liability 81,581 13,656
Currency swap    
Carrying Value and Estimated Fair Values    
Derivative liability 86,178 16,694
Level 1 | Carrying Value    
Carrying Value and Estimated Fair Values    
Cash and cash equivalents 105,235 191,410
Restricted cash and short-term receivables 408,563 74,587
Level 1 | Fair Value    
Carrying Value and Estimated Fair Values    
Cash and cash equivalents 105,235 191,410
Restricted cash and short-term receivables 408,563 74,587
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    
Short-term debt due from related parties 0 20,000
Short-term loans receivable 6,375 8,141
Short-term debt 408,978 108,781
Current portion of long-term debt 92,640 7,650
Long-term debt - convertible bond 243,369 238,037
Long-term debt 1,133,074 1,026,319
Level 2 | Carrying Value | Interest rate swap    
Carrying Value and Estimated Fair Values    
Derivative asset 5,330 12,603
Derivative liability 4,597 3,038
Level 2 | Carrying Value | Equity Swap    
Carrying Value and Estimated Fair Values    
Derivative liability 81,581 13,656
Level 2 | Fair Value    
Carrying Value and Estimated Fair Values    
Short-term debt due from related parties 0 20,000
Short-term loans receivable 6,375 8,141
Short-term debt 408,978 108,781
Current portion of long-term debt 92,640 7,650
Long-term debt - convertible bond 231,945 251,555
Long-term debt 1,133,074 1,026,319
Level 2 | Fair Value | Interest rate swap    
Carrying Value and Estimated Fair Values    
Derivative asset 5,330 12,603
Derivative liability 4,597 3,038
Level 2 | Fair Value | Equity Swap    
Carrying Value and Estimated Fair Values    
Derivative liability $ 81,581 $ 13,656