Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.19.1
Debt (Details) - Amended 2017 Margin Loan Agreement
$ in Thousands
3 Months Ended
Aug. 24, 2018
USD ($)
Mar. 21, 2016
loan
Oct. 30, 2014
loan
Mar. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Charter          
Debt disclosures          
Number of common shares pledged as collateral | shares       6,800,000  
Value of pledged collateral       $ 2,300,000  
SPV          
Debt disclosures          
Number of debt agreements repaid | loan   2 2    
Maximum borrowing capacity $ 1,000,000        
Additional allowed borrowing capacity $ 1,000,000        
Remaining borrowing capacity       $ 475,000  
Debt Instrument, Interest Rate, Effective Percentage       4.10%  
Amount outstanding       $ 525,000 $ 525,000
SPV | Three-month LIBOR          
Debt disclosures          
Interest rate basis three-month LIBOR        
Basis spread on variable rate 1.50%