Quarterly report pursuant to Section 13 or 15(d)

Debt (Summary of Debt) (Details)

v3.20.2
Debt (Summary of Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Outstanding principal $ 3,069,680  
Deferred financing costs (8,302) $ (8,491)
Total debt 3,422,687 3,266,218
Debt classified as current (823,166) (3,008)
Long-term debt 2,599,521 3,263,210
Margin Loan Facility    
Debt Instrument [Line Items]    
Outstanding principal 1,300,000  
Total debt 1,300,000 1,300,000
Exchangeable senior debentures    
Debt Instrument [Line Items]    
Outstanding principal 477,250  
Total debt 820,035 658,839
Senior notes    
Debt Instrument [Line Items]    
Outstanding principal 775,000  
Total debt 793,524 796,138
Senior credit facility    
Debt Instrument [Line Items]    
Outstanding principal 510,822  
Total debt 510,822 512,666
Wells Fargo note payable    
Debt Instrument [Line Items]    
Outstanding principal 6,608  
Total debt $ 6,608 $ 7,066