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FINANCIAL INSTRUMENTS - Fair Values (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Debt Issuance Costs, Net $ 26,308 $ 42,154
Carrying Value and Estimated Fair Values    
Gross amounts presented in the consolidated balance sheet, Total asset derivatives 5,022 5,330
Gross amounts not offset in the consolidated balance sheet subject to netting agreements (1,351) (216)
Net amount, Total asset derivatives 3,671 5,114
Gross amounts presented in the consolidated balance sheet, Total liability derivatives 1,470 4,597
Net amount, Total liability derivatives 119 4,381
Cash collateral $ 415,860 408,563
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 $ 70,000  
Interest rate swap    
Carrying Value and Estimated Fair Values    
Derivative asset 5,022 5,330
Interest rate swap | Not Designated as Hedging Instrument    
Carrying Value and Estimated Fair Values    
Derivative asset 5,022 5,330
Derivative liability 1,470 4,597
Interest rate swap | Cash flow hedging | Designated as Hedging Instrument    
Carrying Value and Estimated Fair Values    
Notional value 1,250,000 1,250,000
Equity Swap | Not Designated as Hedging Instrument    
Carrying Value and Estimated Fair Values    
Derivative liability 56,763 81,581
Currency swap    
Carrying Value and Estimated Fair Values    
Derivative liability 59,226 86,178
Currency swap | Not Designated as Hedging Instrument    
Carrying Value and Estimated Fair Values    
Derivative liability 993 0
Earn-Out Units    
Carrying Value and Estimated Fair Values    
Derivative asset 15,000 0
Earn-Out Units | Not Designated as Hedging Instrument    
Carrying Value and Estimated Fair Values    
Derivative asset 15,000 15,000
Level 1 | Carrying Value    
Carrying Value and Estimated Fair Values    
Cash and cash equivalents 224,190 105,235
Restricted cash and short-term deposits 415,860 408,563
Level 1 | Fair Value    
Carrying Value and Estimated Fair Values    
Cash and cash equivalents 224,190 105,235
Restricted cash and short-term deposits 415,860 408,563
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
Fair Value, Inputs, Level 2 [Member] | Carrying Value    
Carrying Value and Estimated Fair Values    
Short-term loans receivable 0 6,375
Current portion of long-term debt 484,705 501,618
Long-term debt - convertible bond 218,851 243,369
Long-term debt 1,124,105 1,133,074
Fair Value, Inputs, Level 2 [Member] | Carrying Value | Interest rate swap    
Carrying Value and Estimated Fair Values    
Derivative asset 5,022 5,330
Derivative liability 1,470 4,597
Fair Value, Inputs, Level 2 [Member] | Carrying Value | Equity Swap    
Carrying Value and Estimated Fair Values    
Derivative liability 56,763 81,581
Fair Value, Inputs, Level 2 [Member] | Carrying Value | Currency swap    
Carrying Value and Estimated Fair Values    
Foreign Currency Fair Value Hedge Liability at Fair Value 993 0
Fair Value, Inputs, Level 2 [Member] | Carrying Value | Earn-Out Units    
Carrying Value and Estimated Fair Values    
Derivative asset 15,000 0
Fair Value, Inputs, Level 2 [Member] | Fair Value    
Carrying Value and Estimated Fair Values    
Short-term loans receivable 0 6,375
Current portion of long-term debt 484,705 501,618
Long-term debt - convertible bond 219,428 231,945
Long-term debt 1,124,105 1,133,074
Fair Value, Inputs, Level 2 [Member] | Fair Value | Interest rate swap    
Carrying Value and Estimated Fair Values    
Derivative asset 5,022 5,330
Derivative liability 1,470 4,597
Fair Value, Inputs, Level 2 [Member] | Fair Value | Equity Swap    
Carrying Value and Estimated Fair Values    
Derivative liability 56,763 81,581
Fair Value, Inputs, Level 2 [Member] | Fair Value | Earn-Out Units    
Carrying Value and Estimated Fair Values    
Derivative asset $ 15,000 $ 0