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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Net cash provided by operating activities      
Net cash provided by operating activities $ 124,956 $ 122,426  
Investing activities      
Additions to direct financing leases and leaseback assets 0 (65,030)  
Purchase of vessels, capital improvements and other additions (4,144) (40,278)  
Investment in newbuilding contracts and vessel deposits (18,783) 0  
Proceeds from sales of vessels and termination of charters (519) 34,581  
Net amounts paid to/(received from) associated companies (588) 15,941  
Proceeds from sale of shares 0 21,055  
Other investments and long term assets, net 308    
Other investments and long term assets, net   (32,527)  
Net cash used in investing activities (23,726) (66,258)  
Financing activities      
Shares issued, net of issuance costs 83,428 12,659  
Principal settlements of cross currency swaps, net 0 (11,706)  
Payment for early settlements of interest rate swaps, net 0 (4,539)  
Repurchase of bonds (68,146) (64,795)  
Proceeds from issuance of short-term and long-term debt 252,000 347,231  
Repayments of short-term and long-term debt (151,668) (275,905)  
Debt fees paid (3,573) (4,199)  
Repayment of lease obligation liability (24,238) (32,925)  
Cash dividends paid (35,713) (64,887)  
Net cash used in financing activities 52,090 (99,066)  
Net change in restricted cash and cash and cash equivalents 153,320 (42,898)  
Cash, restricted cash and cash equivalents at start of the period 224,398 203,016 $ 203,016
Cash, restricted cash and cash equivalents at end of the period 377,718 160,118 224,398
Cash, restricted cash and cash equivalents:      
Cash and cash equivalents 371,852 152,124 215,445
Restricted cash 5,866 7,994 8,953
Cash, restricted cash and cash equivalents at end of the period $ 377,718 $ 160,118 $ 224,398