Commitments and contingencies (Tables)

12 Months Ended

Dec. 31, 2020

Commitments and contingencies

Schedule of future minimum payments due under non-cancelable operating leases

At December 31, 2020, approximate future minimum payments due under non-cancelable operating leases were as follows:

Period	Scheduled payments
2021	$	48,669
2022		48,755
2023		46,855
2024 and thereafter		426,972
Total undiscounted lease liability		571,251
Impact of discount		(282,332)
Lease liability at December 31, 2020		288,919
Less current portion of lease liability		(15,710)
Less long-term lease liabilities transferred to liabilities associated with assets held for sale		(2,714)
Long-term portion of lease liability	$	270,495

Schedule of movements relating to the right-of-use lease asset balances

Carrying amount, January 1, 2020	$	82,794
ROU assets acquired (Note 4)		155,662
Additions to leased assets		53,527
Depreciation charges		(22,553)
Transferred to assets held for sale		(2,262)
Carrying amount, December 31, 2020	$	267,168