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Financial Instruments (Details) - USD ($)
 6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Carrying Value and Estimated Fair Values    
Cost method investments $ 204,172,000 $ 204,172,000
Investment in affiliates 323,995,000 335,372,000
Derivative asset 28,226,000 12,603,000
Derivative liability 1,639,000 16,694,000
Interest Rate Swap | Cash Flow Hedging    
Carrying Value and Estimated Fair Values    
Derivative notional amount 0 100,900,000
Derivative asset (liability) 0 400,000
Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument    
Carrying Value and Estimated Fair Values    
Derivative notional amount $ 1,250,000,000 1,475,900,000.0
Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument | Minimum    
Carrying Value and Estimated Fair Values    
Maturity Dates Dec. 31, 2014  
Fixed Interest Rates 1.13%  
Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument | Maximum    
Carrying Value and Estimated Fair Values    
Maturity Dates Dec. 31, 2021  
Fixed Interest Rates 1.94%  
Carrying Value | Level 1    
Carrying Value and Estimated Fair Values    
Cash and cash equivalents $ 374,828,000 191,410,000
Restricted cash 35,524,000 74,587,000
Investment in available-for-sale securities 40,485,000 275,307,000
Carrying Value | Level 2    
Carrying Value and Estimated Fair Values    
Short-term debt due from a related party 0 20,000,000
Long term debt due from a related party 100,000,000 0
Short term loans receivable 87,092,000 0
Long term loans receivable 53,000,000 0
Short-term debt 224,864,000 116,431,000
Long-term debt - convertible bonds 240,662,000 238,037,000
Long-term debt - floating 1,352,462,000 1,026,319,000
Carrying Value | Level 2 | Interest Rate Swap    
Carrying Value and Estimated Fair Values    
Derivative asset 6,995,000 12,603,000
Derivative liability 1,639,000 3,038,000
Carrying Value | Level 2 | Return Equity Swap    
Carrying Value and Estimated Fair Values    
Derivative asset 21,231,000 0
Derivative liability 0 13,656,000
Carrying Value | Level 3    
Carrying Value and Estimated Fair Values    
Cost method investments 204,172,000 204,172,000
Investment in affiliates 323,995,000 335,372,000
Fair value | Level 1    
Carrying Value and Estimated Fair Values    
Cash and cash equivalents 374,828,000 191,410,000
Restricted cash 35,524,000 74,587,000
Investment in available-for-sale securities 40,485,000 275,307,000
Fair value | Level 2    
Carrying Value and Estimated Fair Values    
Short-term debt due from a related party 0 20,000,000
Long term debt due from a related party 100,000,000 0
Short term loans receivable 87,092,000 0
Long term loans receivable 53,000,000 0
Short-term debt 224,864,000 116,431,000
Long-term debt - convertible bonds 302,678,000 251,555,000
Long-term debt - floating 1,352,462,000 1,026,319,000
Fair value | Level 2 | Interest Rate Swap    
Carrying Value and Estimated Fair Values    
Derivative asset 6,995,000 12,603,000
Derivative liability 1,639,000 3,038,000
Fair value | Level 2 | Return Equity Swap    
Carrying Value and Estimated Fair Values    
Derivative asset 21,231,000 0
Derivative liability 0 13,656,000
Fair value | Level 3    
Carrying Value and Estimated Fair Values    
Cost method investments 221,140,000 307,939,000
Investment in affiliates $ 323,995,000 $ 335,372,000