Income taxes - Components of income tax expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current income tax expense
Puerto Rico	$ 156,425	$ 69,415	$ 33,281
Federal and States	9,034	10,232	3,613
Subtotal current income tax expense	165,459	79,647	36,894
Deferred income tax expense (benefit)
Puerto Rico	(4,373)	179,688	69,300
Federal and States	(28,756)	49,683	5,744
Subtotal deferred income tax expense (benefit)	(33,129)	229,371	75,044
Income tax expense	$ 132,330	$ 309,018	$ 111,938