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Financial Instruments (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Non-Derivatives:        
Cash and cash equivalents $ 139,834,000 $ 217,835,000 $ 375,067,000 $ 214,862,000
Restricted cash and short-term deposits, carrying value 405,586,000 486,426,000    
Current portion of long-term debt and short-term debt, carrying value (802,323,000) (730,257,000)    
Long-term debt (1,665,185,000) (1,835,102,000)    
Derivatives:        
Derivative asset 1,928,000 10,770,000    
Derivative liability (3,384,000) 0    
Deferred finance charges 13,020,000 16,837,000    
Interest Rate Swaps        
Derivatives:        
Notional value 250,000,000.0      
Interest Rate Swaps | Cash Flow Hedging        
Derivatives:        
Notional value $ 950,000,000      
Interest Rate Swaps | Minimum | Cash Flow Hedging        
Derivatives:        
Fixed interest rates 1.28%      
Interest Rate Swaps | Maximum | Cash Flow Hedging        
Derivatives:        
Fixed interest rates 2.37%      
Carrying value | Level 1        
Non-Derivatives:        
Cash and cash equivalents $ 139,834,000 217,835,000    
Restricted cash and short-term deposits, carrying value 405,586,000 486,426,000    
Carrying value | Level 2        
Non-Derivatives:        
Current portion of long-term debt and short-term debt, carrying value (806,999,000) (732,184,000)    
Long-term debt - convertible bonds, carrying value (360,665,000) (353,661,000)    
Long-term debt (1,312,864,000) (1,496,351,000)    
Carrying value | Level 2 | Oil Derivative        
Derivatives:        
Derivative asset 85,572,000 84,730,000    
Carrying value | Level 2 | Interest Rate Swaps        
Derivatives:        
Derivative asset 1,928,000 10,770,000    
Derivative liability (3,384,000) 0    
Carrying value | Level 2 | Foreign Exchange Swaps        
Derivatives:        
Foreign exchange swaps asset 92,000 0    
Foreign exchange swaps liability (1,094,000) (1,322,000)    
Carrying value | Level 2 | Return Equity Swap        
Derivatives:        
Derivative liability (83,410,000) (70,804,000)    
Fair value | Level 1        
Non-Derivatives:        
Cash and cash equivalents, fair value 139,834,000 217,835,000    
Restricted cash and short-term deposits, fair value 405,586,000 486,426,000    
Fair value | Level 2        
Non-Derivatives:        
Current portion of long-term debt and short-term debt, fair value (906,999,000) (732,184,000)    
Long-term debt - convertible bonds, fair value (372,651,000) (373,029,000)    
Long-term debt, fair value (1,212,864,000) (1,496,351,000)    
Fair value | Level 2 | Oil Derivative        
Derivatives:        
Derivative asset 85,572,000 84,730,000    
Fair value | Level 2 | Interest Rate Swaps        
Derivatives:        
Derivative asset 1,928,000 10,770,000    
Derivative liability (3,384,000) 0    
Fair value | Level 2 | Foreign Exchange Swaps        
Derivatives:        
Foreign exchange swaps asset 92,000 0    
Foreign exchange swaps liability (1,094,000) (1,322,000)    
Fair value | Level 2 | Return Equity Swap        
Derivatives:        
Derivative liability $ (83,410,000) $ (70,804,000)