STOCKHOLDERS' EQUITY: - Employee Stock Purchase Plan (Details) $ / shares in Units, $ in Millions	1 Months Ended				12 Months Ended
	Nov. 30, 2018 $ / shares	Nov. 30, 2018 $ / shares	Jan. 31, 2015 $ / shares	Jan. 31, 2015 $ / shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares
Retained earnings
Dividends paid as cash dividend (in dollars per share)					$ 3.50	$ 3.20	$ 1.50
Peruvian Operations
Non-controlling interest
Investment shareholders' interest in Peruvian Branch (as a percent)					0.71%
Employee Stock Purchase 2015 Plan
Information related to compensation cost
Purchase price for initial subscription (in dollars per share) | (per share)			$ 2.63	$ 38.44	$ 2.63
Percentage of title acquired by employee in every two years on shares paid in previous two years					50.00%
Period of plan					8 years
Ratio of bonus shares granted to participant					0.1
Stock based compensation expense | $					$ 0.6	$ 0.6	$ 0.6
Unrecognized compensation expense | $					$ 0.2	$ 0.8	$ 1.4
Stock award activity, Shares
Outstanding shares at the beginning of the period | shares					867,234	1,264,410
Exercised (in shares) | shares					(21,339)	(397,176)
Outstanding shares at the end of the period | shares					845,895	867,234	1,264,410
Unit Weighted Average Grant Date Fair Value
Outstanding shares at the beginning of the period (in dollars per share)					$ 2.63	$ 2.63
Exercised (in dollars per share)					2.63	2.63
Outstanding shares at the end of the period (in dollars per share)					$ 2.63	$ 2.63	$ 2.63
Employee Stock Purchase 2018 Plan
Information related to compensation cost
Purchase price for initial subscription (in dollars per share) | (per share)	$ 1.86	$ 37.89
Percentage of title acquired by employee in every two years on shares paid in previous two years					50.00%
Period of plan					8 years
Ratio of bonus shares granted to participant					0.1
Stock based compensation expense | $					$ 0.7	$ 0.7	$ 0.7
Unrecognized compensation expense | $					$ 2.4	$ 3.1	$ 3.8
Stock award activity, Shares
Outstanding shares at the beginning of the period | shares					3,173,924	3,918,458
Exercised (in shares) | shares					(419,418)	(744,534)
Outstanding shares at the end of the period | shares					2,754,506	3,173,924	3,918,458
Unit Weighted Average Grant Date Fair Value
Outstanding shares at the beginning of the period (in dollars per share)					$ 1.86	$ 1.86
Exercised (in dollars per share)					1.86	1.86
Outstanding shares at the end of the period (in dollars per share)					$ 1.86	$ 1.86	$ 1.86