Description of the business: Stockholders' deficit (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT)
Balance	$ (548,547)	$ (408,606)	$ (518,632)	$ (373,098)
Balance (in shares)			48,013,330
Equity-based compensation	6,809	6,479	$ 14,124	13,093
Foreign currency translation	1,741	(7,493)	3,529	(9,658)
Issuances of common stock	1		1
Exercises of options	240	130	385	334
Dividends paid	(44,907)	(41,855)	(90,218)	(83,153)
Net income	1,123,863	11,164	1,130,011	12,301
Balance	$ 539,200	(440,181)	$ 539,200	(440,181)
Balance (in shares)	48,617,162		48,617,162
Common Stock
CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT)
Balance	$ 48	$ 48	$ 48	$ 48
Balance (in shares)	48,296,882	47,926,580	48,013,330	47,674,189
Forfeitures of shares granted to employees (in shares)	(5,321)	(42,783)	(11,830)	(52,365)
Issuances of common stock	$ 1		$ 1
Issuances of common stock (in shares)	320,430	116,480	607,192	373,280
Exercises of options (in shares)	5,171	3,447	8,470	8,620
Balance	$ 49	$ 48	$ 49	$ 48
Balance (in shares)	48,617,162	48,003,724	48,617,162	48,003,724
Additional Paid-in Capital
CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT)
Balance	$ 582,524	$ 554,552	$ 575,064	$ 547,734
Equity-based compensation	6,809	6,479	14,124	13,093
Exercises of options	240	130	385	334
Balance	589,573	561,161	589,573	561,161
Accumulated Other Comprehensive Income (Loss)
CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT)
Balance	(17,368)	(13,168)	(19,156)	(11,003)
Foreign currency translation	1,741	(7,493)	3,529	(9,658)
Balance	(15,627)	(20,661)	(15,627)	(20,661)
Accumulated Deficit
CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT)
Balance	(1,113,751)	(950,038)	(1,074,588)	(909,877)
Dividends paid	(44,907)	(41,855)	(90,218)	(83,153)
Net income	1,123,863	11,164	1,130,011	12,301
Balance	$ (34,795)	$ (980,729)	$ (34,795)	$ (980,729)