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Consolidated financial statements (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accounts payable $ (3,543) $ (10,145)
Net cash provided by operating activities 39,581 26,468
Purchases of capital assets (21,670) (14,269)
Net cash used by investing activities (21,850) (13,915)
Proceeds from issuing long-term debt 5,000 309,000
Payments on long-term debt (5,000) (52,500)
Net cash provided by financing activities (14,231) 211,156
Net change in cash, cash equivalents, restricted cash and restricted cash equivalents $ 5,106 210,992
As previously reported [Member]    
Accounts payable   (18,059)
Net cash provided by operating activities   18,554
Purchases of capital assets   (6,355)
Net cash used by investing activities   (6,001)
Proceeds from issuing long-term debt   1,011,000
Payments on long-term debt   (754,500)
Net cash provided by financing activities   211,156
Net change in cash, cash equivalents, restricted cash and restricted cash equivalents   210,992
Adjustment [Member]    
Accounts payable   7,914
Net cash provided by operating activities   7,914
Purchases of capital assets   (7,914)
Net cash used by investing activities   (7,914)
Proceeds from issuing long-term debt   (702,000)
Payments on long-term debt   702,000
Net cash provided by financing activities   0
Net change in cash, cash equivalents, restricted cash and restricted cash equivalents   $ 0