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Financial Instruments (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Carrying Value and Estimated Fair Values    
Cost method investments $ 7,347,000 $ 7,347,000
Derivative asset 0 5,330,000
Derivative liability 17,965,000 4,597,000
Deferred charges 28,166,000 42,154,000
Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument    
Carrying Value and Estimated Fair Values    
Derivative notional amount $ 1,250,000,000  
Interest Rate Swap | Minimum | Cash Flow Hedging | Designated as Hedging Instrument    
Carrying Value and Estimated Fair Values    
Fixed interest rates 1.13%  
Interest Rate Swap | Maximum | Cash Flow Hedging | Designated as Hedging Instrument    
Carrying Value and Estimated Fair Values    
Fixed interest rates 1.94%  
Carrying value | Level 1    
Carrying Value and Estimated Fair Values    
Cash and cash equivalents $ 137,904,000 105,235,000
Restricted cash and short-term receivables 469,846,000 408,563,000
Carrying value | Level 2    
Carrying Value and Estimated Fair Values    
Short-term loans receivable 0 6,375,000
Current portion of long-term debt and short-term debt 488,927,000 501,618,000
Long-term debt - convertible bonds 247,585,000 243,369,000
Long-term debt 1,091,945,000 1,133,074,000
Carrying value | Level 2 | Interest Rate Swap    
Carrying Value and Estimated Fair Values    
Derivative asset 0 5,330,000
Derivative liability 17,965,000 4,597,000
Carrying value | Level 2 | Return Equity Swap    
Carrying Value and Estimated Fair Values    
Derivative liability 61,698,000 81,581,000
Carrying value | Level 3    
Carrying Value and Estimated Fair Values    
Cost method investments 7,347,000 7,347,000
Fair value | Level 1    
Carrying Value and Estimated Fair Values    
Cash and cash equivalents 137,904,000 105,235,000
Restricted cash and short-term receivables 469,846,000 408,563,000
Fair value | Level 2    
Carrying Value and Estimated Fair Values    
Short-term loans receivable 0 6,375,000
Current portion of long-term debt and short-term debt 488,927,000 501,618,000
Long-term debt - convertible bonds 245,923,000 231,945,000
Long-term debt 1,091,945,000 1,133,074,000
Fair value | Level 2 | Interest Rate Swap    
Carrying Value and Estimated Fair Values    
Derivative asset 0 5,330,000
Derivative liability 17,965,000 4,597,000
Fair value | Level 2 | Return Equity Swap    
Carrying Value and Estimated Fair Values    
Derivative liability 61,698,000 81,581,000
Fair value | Level 3    
Carrying Value and Estimated Fair Values    
Cost method investments $ 7,347,000 $ 7,347,000